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Superior National Forest

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Superior National Forest , part of the United States National Forest system, is located in the Arrowhead Region of the state of Minnesota between the Canada–United States border and the north shore of Lake Superior . The area is part of the greater Boundary Waters region along the border of Minnesota and the Canadian province of Ontario , a historic and important thoroughfare in the fur trading and exploring days of New France and British North America .

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128-557: Under the administration of the United States Forest Service , the Superior National Forest comprises over 3,900,000 acres (6,100 mi or 16,000 km) of woods and waters. The majority of the forest is multiple-use, including both logging and recreational activities such as camping, boating, and fishing. Slightly over a quarter of the forest is set aside as a wilderness reserve known as

256-466: A U.S. Forest Service firefighter who (along with his crew) watches over a group of rambunctious children while searching for their parents after rescuing them from a fire in the wilderness during a family vacation. The history of the Forest Service has been fraught with controversy, as various interests and national values have grappled with the appropriate management of the many resources within

384-399: A bed of fine gravel in a riffle above a pool. A female trout clears a redd in the gravel by turning on her side and beating her tail up and down. Female rainbow trout usually produce 2000 to 3000 4-to-5-millimetre ( 5 ⁄ 32 – 3 ⁄ 16  in) eggs per kilogram of weight. During spawning, the eggs fall into spaces between the gravel, and immediately the female begins digging at

512-754: A broad reddish stripe along the lateral line , from gills to the tail, which is most vivid in breeding males. Wild-caught and hatchery -reared forms of the species have been transplanted and introduced for food or sport in at least 45 countries and every continent except Antarctica. Introductions to locations outside their native range in the United States, Southern Europe, Australia, New Zealand, and South America have damaged native fish species. Introduced populations may affect native species by preying on them, out-competing them, transmitting contagious diseases (such as whirling disease ), or hybridizing with closely related species and subspecies. The rainbow trout

640-418: A century ago, but its range has spread and it has appeared in most of Europe, northern Asia, the U.S., South Africa and other countries. In the 1980s, M. cerebralis was found to require Tubifex tubifex (a kind of segmented worm ) to complete its life cycle . The parasite infects its hosts with its cells after piercing them with polar filaments ejected from nematocyst -like capsules. This parasite

768-651: A century of hatchery stocking. Genetic analysis shows that the South Central California Coast and Southern California populations from Malibu Creek north, including the San Gabriel River , Santa Ana River , and San Mateo Creek , are not hatchery strains. Steelhead from Topanga Creek and the Sweetwater River were partly, and those from San Juan Creek completely, of hatchery origin. Genetic analysis has also shown that

896-618: A decline or even elimination of whole cohorts of fish. The parasite M. cerebralis was first recorded in North America in 1956 in Pennsylvania, but until the 1990s, whirling disease was considered a manageable problem affecting only rainbow trout in hatcheries. It eventually became established in the natural waters of the Rocky Mountain states ( Colorado , Wyoming, Utah , Montana , Idaho , New Mexico ), where it

1024-437: A generally appealing flavor. Seafood Watch ranks farmed rainbow trout as a "Best Choice" fish for human consumption. In Montana , it is illegal to sell or market wild-caught rainbow trout, which are legally classified as game fish. The color and flavor of the flesh depend on the diet and freshness of the trout. Farmed trout and some populations of wild trout, especially anadromous steelhead, have reddish or orange flesh as

1152-671: A key role in formulating policy and coordinating U.S. support for the protection and sound management of the world's forest resources. It works closely with other agencies such as USAID , the State Department , and the Environmental Protection Agency , as well as with nonprofit development organizations, wildlife organizations, universities, and international assistance organizations. The Forest Service's international work serves to link people and communities striving to protect and manage forests throughout

1280-467: A mixed conifer-hardwood forest known as the North Woods , a transition province between the northern boreal forest and deciduous forests to the south. While the forest is dominated by Conifers that include several varieties of pine , fir , and spruce trees, principal deciduous species such as mountain ash , maple , aspen and paper birch are also rather common, note the paper birch, one of

1408-545: A pit latrine and a fire grate, and no permits or fees. Additionally, dispersed camping is permitted anywhere on undeveloped public land without permit or fee. An exception is made for the designated wilderness of the Boundary Waters Canoe Area, which requires special permits for entrance. Tofte Ranger District In January 2023, the Biden administration set a 20-year moratorium on mining in 225,000 acres of

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1536-749: A rainbow trout species that can be completely fed on a vegan diet through genetic selection. Research from a study team led by USDA research geneticist Dr. Ken Overturf concluded that such natural genetic variation of vegan trouts does exist and believe they can produce rainbow trouts that can be completely fed on a 100% plant-based diet. Populations of many rainbow trout subspecies, including anadromous forms (steelhead) of O. m. irideus (coastal rainbow trout) and O. m. gairdneri (Columbia River redband trout), have declined in their native ranges due to over-harvest, habitat loss, disease, invasive species , pollution and hybridization with other subspecies, and some introduced populations, once healthy, have declined for

1664-691: A range of biological, physical, and social science fields to promote sustainable management of United States' diverse forests and rangelands. Research employs about 550 scientists and several hundred technical and support staff, located at 67 sites throughout the United States and in Puerto Rico . Discovery and technology development and transfer is carried out through seven research stations. Research focuses on informing policy and land management decisions and includes addressing invasive insects, degraded river ecosystems , or sustainable ways to harvest forest products. The researchers work independently and with

1792-680: A range of partners (formerly through a National Partnership Office ), including other agencies, academia, nonprofit groups, and industry. The information and technology produced through basic and applied science programs is available to the public for its benefit and use. In addition to the Research Stations, the USFS R&;D branch also leads several National Centers such as the National Genomics Center for Wildlife and Fish Conservation . The Forest Service plays

1920-635: A regular and recurring presence on a vast amount of public lands, roads, and recreation sites. The primary focus of their jobs is the protection of natural resources, protection of Forest Service employees and the protection of visitors. To cover the vast and varied terrain under their jurisdiction, they use modified 4x4 pickup trucks, Ford Crown Victoria Police Interceptors , special service SUVs , horses, K-9 units , helicopters, snowmobiles , dirt bikes, and boats. Special Agents are criminal investigators who plan and conduct investigations concerning possible violations of criminal and administrative provisions of

2048-641: A result of high astaxanthin levels in their diets. Astaxanthin is a powerful antioxidant that may be from a natural source or a synthetic trout feed. Rainbow trout raised to have pinker flesh from a diet high in astaxanthin are sometimes sold in the U.S. with labeling calling them "steelhead". As wild steelhead are in decline in some parts of their range, farmed rainbow trout are viewed as a preferred alternative. In Chile and Norway , rainbow trout farmed in saltwater sea cages are sold labeled as steelhead. Trout can be cooked as soon as they are cleaned, without scaling , skinning , or filleting . If cooked with

2176-525: A short history of how agency responsibilities have grown and evolved over its 118-year history in accordance with "what the American people desire from their natural resources at any given point in time." In the spring of 2023, the USDA proposed a change to its regulations to allow for the "responsible deployment of" carbon capture, utilization, and sequestration on National Forests lands. Although part of

2304-714: A similar latitude. The range of coastal rainbow trout ( O. m. irideus ) extends north from the Pacific basin into tributaries of the Bering Sea in northwest Alaska, while forms of the Columbia River redband trout ( O. m. gairdneri ) extend east into the upper Mackenzie River and Peace River watersheds in British Columbia and Alberta, Canada, which eventually drain into the Beaufort Sea , part of

2432-641: A staff of 10 to 300 people under the direction of a district ranger, a line officer who reports to a forest supervisor. The districts vary in size from 50,000 acres (200 km ) to more than 1 million acres (4,000 km ). Most on-the-ground activities occur on ranger districts, including trail construction and maintenance, operation of campgrounds, oversight of a wide variety of special use permitted activities, and management of vegetation and wildlife habitat. U.S. Forest Service Law Enforcement & Investigations (LEI), headquartered in Washington, D.C. ,

2560-724: Is a federal law enforcement agency of the U.S. government. It is responsible for enforcement of federal laws and regulations governing national forest lands and resources. All law enforcement officers and special agents receive their training through Federal Law Enforcement Training Center (FLETC). Operations are divided into two major functional areas: Uniformed Law Enforcement Officers (LEOs) enforce federal laws and regulations governing national forest lands and resources. LEOs also enforce some or all state laws on National Forest Lands. As part of that mission, LEOs carry firearms, defensive equipment, make arrests, execute search warrants , complete reports, and testify in court. They establish

2688-544: Is a non-profit organization dedicated to the conservation of North American freshwater streams, rivers, and associated upland habitats for trout, salmon, other aquatic species, and people. A typical TU project is the Circle Creek Fish Passage Project, in which access to a spawning stream is being improved for steelhead and other salmonid species. The Wild Salmon Center , an international coalition of Russian, Canadian and U.S. scientists, sponsors

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2816-533: Is an accepted version of this page The rainbow trout ( Oncorhynchus mykiss ) is a species of trout native to cold-water tributaries of the Pacific Ocean in North America and Asia. The steelhead (sometimes called steelhead trout ) is an anadromous (sea-run) form of the coastal rainbow trout ( O. m. irideus ) or Columbia River redband trout ( O. m. gairdneri ) that usually returns to freshwater to spawn after living two to three years in

2944-571: Is common. Rainbow trout can also be caught on various live and dead natural baits . Many anglers consider the rainbow trout the hardest-fighting trout species, as this fish is known for leaping when hooked and putting up a powerful struggle. It is considered one of the top five sport fish in North America, and the most important game fish west of the Rocky Mountains . There are tribal commercial fisheries for steelhead in Puget Sound ,

3072-448: Is completely consumed, and fry commence feeding mainly on zooplankton . The growth rate of rainbow trout varies with area, habitat, life history, and quality and quantity of food. As fry grow, they begin to develop "parr" marks or dark vertical bars on their sides. In this juvenile stage, immature trout are often called "parr" because of the marks. These small juvenile trout are sometimes called 'fingerlings' because they are approximately

3200-467: Is damaging several sport fishing rivers. Some streams in the western U.S. lost 90 percent of their trout. Whirling disease threatens recreational fishing, which is important for the tourism industry, a key component of the economies of some U.S. western states. For example, in 2005 anglers in Montana spent approximately $ 196,000,000 in activities directly related to trout fishing in the state. Some of

3328-534: Is evidence North American fishes are unable to digest the tiny but hard shells of the mud snail, and that their presence may result in poor growth outcomes for rainbow trout. The mud snail was first detected in the U.S. in Idaho's Snake River in 1987. Since then, the snail has spread to the Madison River , Firehole River, and other watercourses around Yellowstone National Park, and has been discovered throughout

3456-489: Is included in the list of the top 100 globally invasive species . Other introductions into waters previously devoid of fish or with severely depleted stocks of native fish have created sport fisheries , such as the Great Lakes and Wyoming 's Firehole River . Some local populations of specific subspecies, or in the case of steelhead, distinct population segments , are listed as either threatened or endangered under

3584-561: Is isolated in Lake Crescent (Washington), is threatened by the loss of its only spawning grounds in the Lyre River to siltation and other types of habitat degradation. Myxobolus cerebralis is a myxosporean parasite of salmonids (salmon, trout, and their allies) that causes whirling disease in pen farmed salmon and trout and also in wild fish populations . It was first described in rainbow trout introduced to Germany

3712-434: Is not the deposition of glacial drift (unlike most of the rest of Minnesota), but the remodeling of the landscape by the scraping away of softer surfaces down to bare hard rock. The land therefore is raw, with many outcroppings of ancient bedrock, overlain in places by thin layers of gravelly soil and, in the west, silts deposited by Glacial Lake Agassiz . The forest contains a small slice of true boreal forest ( taiga ), and

3840-513: Is popular in Western cuisine ; both wild-caught and farmed fish are eaten. It has tender flesh and a mild, somewhat nutty flavor. Wild fish has a stronger, gamier taste than farmed fish. While the taste of wild-caught trout is often promoted as superior, rainbow trout and "steelhead" sold in American restaurants is typically farmed . Farmed rainbow trout are considered one of the safest fish to eat and are noted for high levels of vitamin B and

3968-758: Is that the National Park Service was created in 1916 to manage Yellowstone and several other parks; in 1956, the Fish and Wildlife Service became the manager of lands reserved for wildlife. The Grazing Service and the United States General Land Office were combined to create the Bureau of Land Management in 1946. Also of note was that it was not until 1976 that the Federal Land Policy and Management Act became

Superior National Forest - Misplaced Pages Continue

4096-501: Is the sole major national land management agency not part of the U.S. Department of the Interior (which manages the National Park Service , the U.S. Fish and Wildlife Service and the Bureau of Land Management ). The concept of national forests was born from Theodore Roosevelt 's conservation group, Boone and Crockett Club , due to concerns regarding Yellowstone National Park beginning as early as 1875. In 1876, Congress formed

4224-596: The Boundary Waters Canoe Area (BWCA), where canoers can travel along interconnected fresh waters near land as well as over historic portages once used by Native American tribes and First Nations people, but later also by European explorers and traders. The forest is located in Cook , Lake , and Saint Louis counties in northeastern Minnesota. Forest headquarters are located in Duluth , outside

4352-615: The Columbia River who provided Richardson with specimens. In 1855, William P. Gibbons, the curator of Geology and Mineralogy at the California Academy of Sciences , found a population and named it Salmo iridia (Latin: rainbow), later corrected to Salmo irideus . These names faded once it was determined that Walbaum's description of type specimens was conspecific and therefore had precedence . In 1989, morphological and genetic studies indicated that trout of

4480-607: The Cooperative Forestry Assistance Act , P.L. 95-313; and the Forest and Rangelands Renewable Resources Planning Act , P.L. 95-307. From the early 1900s to the present, there has been a fierce rivalry over control of forests between the Department of Agriculture and the Department of the Interior. Their roles overlap but numerous proposals to combine the two have failed. Most recently, in 2009,

4608-634: The Endangered Species Act . The steelhead is the official state fish of Washington . The scientific name of the rainbow trout is Oncorhynchus mykiss . The species was originally named by German naturalist and taxonomist Johann Julius Walbaum in 1792 based on type specimens from the Kamchatka Peninsula in Siberia. Walbaum's original species name, mykiss , was derived from the local Kamchatkan name used for

4736-498: The Government Accountability Office (GAO) evaluated whether the Forest Service should be moved from the Department of Agriculture to the Department of the Interior, which already manages some 438 million acres (1,770,000 km ) of public land through the National Park Service , the Fish and Wildlife Service , and the Bureau of Land Management . GAO ultimately did not offer a recommendation upon

4864-743: The Misquah Hills including Eagle Mountain , the state's highest point, and other uplands along the Laurentian Divide separating the watershed of the Great Lakes and Atlantic Ocean from that of Hudson Bay and the Arctic Ocean. Despite the presence of dramatic cliffs and other local differences in elevation, the area is essentially flat, as it is part of an old peneplain eroded by weathering, water, and especially glaciers. The principal surficial result of recent glaciation

4992-599: The Pacific Basin were genetically closer to Pacific salmon ( Oncorhynchus species) than to the Salmo s – brown trout ( Salmo trutta ) or Atlantic salmon ( Salmo salar ) of the Atlantic Basin . Thus, in 1989, taxonomic authorities moved the rainbow, cutthroat , and other Pacific Basin trout into the genus Oncorhynchus . Walbaum's name had precedence, so the species name Oncorhynchus mykiss became

5120-663: The Tongass National Forest in Alaska and ski areas such as Alta, Utah in the Wasatch-Cache National Forest . In addition, the Forest Service is responsible for managing National Grasslands in the midwest. Furthermore, areas designated as wilderness by acts of Congress , prohibit logging, mining, road and building construction and land leases for purposes of farming and or livestock grazing. Since 1978, several Presidents have directed

5248-444: The Washington coast, and in the Columbia River , but there has been controversy regarding overharvesting of native stocks . The highly desirable sporting qualities and adaptability of the rainbow trout to hatchery rearing and new habitats resulted in it being introduced to many countries around the world by or at the behest of sport fishermen. Many of these introductions have resulted in environmental and ecological problems, as

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5376-712: The adipose fin is a management tool used to identify hatchery-reared fish. Rainbow trout, including steelhead forms, generally spawn in early to late spring (January to June in the Northern Hemisphere and September to November in the Southern Hemisphere) when water temperatures reach at least 6 to 7 °C (42 to 44 °F). The maximum recorded lifespan for a rainbow trout is 11 years. Freshwater resident rainbow trout usually inhabit and spawn in small to moderately large, well-oxygenated, shallow rivers with gravel bottoms. They are native to

5504-518: The alluvial or freestone streams that are typical tributaries of the Pacific basin but introduced rainbow trout have established wild, self-sustaining populations in other river types such as bedrock and spring creeks . Lake-resident rainbow trout are usually found in moderately deep, cool lakes with adequate shallows and vegetation to support the production of sufficient food sources. Lake populations generally require access to gravelly-bottomed streams to be self-sustaining. Spawning sites are usually

5632-697: The bald eagle and other raptors , the ubiquitous common loon , and northern waterfowl . The Superior National Forest features a long segment of the 4,800-mile North Country National Scenic Trail [1] from just south of Burntside Lake by Ely to just south of Temperance River State Park near Schroeder. This segment includes (from West to East) the Kekekabic Trail, Border Route Trail, and Superior Hiking Trail. The Superior National Forest maintains developed fee campgrounds with amenities like drinking water and garbage disposal, rustic campgrounds without drinking water or fees, and backcountry campsites with only

5760-675: The mitochondria are the most important organelle contributing to tissue damage because of their role in metabolism and production of reactive oxygen species . In a study done by Almaida-Pagàn et al., researchers identified changes to the heart and brain mitochondrial membrane phospholipid composition in rainbow trout due to the differing levels of oxidative stress each organ faced during a high-stress time such as rapid growth and development. Stock rainbow trout of ages 1, 2, and 4 years had their heart and brain mitochondria isolated and analyzed for fatty acid composition. The tissues showed an overall similar percentage of total phospholipids but differed in

5888-399: The 195 million acres (790,000 km ) of public land administered by the Forest Service. Individual sites range from 47 to 22,500 ha in size. Operations of Experimental Forests and Ranges are directed by local research teams for the individual sites, by Research Stations for the regions in which they are located, and at the level of the Forest Service. Major themes in research at

6016-546: The 3,400 km (2,100 mi) river system. Neither method of control is 100% effective and are best regarded as methods to change the relative population sizes of fish species. Steelhead populations in parts of its native range have declined due to a variety of human and natural causes. While populations in Alaska and along the British Columbia coast are considered healthy, populations in Kamchatka and some populations along

6144-438: The Arctic Ocean. Since 1875, the rainbow trout has been widely introduced into suitable lacustrine and riverine environments throughout the United States and around the world. Many of these introductions have established wild, self-sustaining populations. Since 1870, rainbow trout have been artificially propagated in fish hatcheries to restock streams and introduce them into non-native waters. The first rainbow trout hatchery

6272-491: The Chief. Research stations include Northern, Pacific Northwest, Pacific Southwest, Rocky Mountain , and Southern . There are 92 research work units located at 67 sites throughout the United States. there are 80 Experimental Forests and Ranges that have been established progressively since 1908; many sites are more than 50 years old. The system provides places for long-term science and management studies in major vegetation types of

6400-478: The Department of Agriculture, the Forest Service receives its budget through the Subcommittee on Appropriations—Interior, Environment, and Related Agencies. The Forest Service achieved widespread awareness during the 1960s, as it became the setting for the long running classic TV show Lassie , with storylines focusing on Lassie's adventures with various forest rangers. The iconic collie's association with

6528-486: The Experimental Forests and Ranges includes: develop of systems for managing and restoring forests, range lands, and watersheds; investigate the workings of forest and stream ecosystems; characterize plant and animal communities; observe and interpret long-term environmental change and many other themes. There are nine regions in the Forest Service; numbered 1 through 10 (Region 7 was eliminated in 1965 when

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6656-536: The FY 2019 Annualized Continuing Resolution includes $ 500 million above the base as bridge to the first year of the fire fix. The Forest Service, headquartered in Washington, D.C., has 27,062 permanent, full-time employees as of Sept. 20, 2018, including 541 in the headquarters office and 26,521 in regional and field office. The USDA Forest Service's mission is to sustain the health, diversity, and productivity of

6784-478: The Forest Service adapt current policies and develop new policies and actions to conserve and manage the national forests and grasslands for climate resilience, so that the Agency can provide for ecological integrity and support social and economic sustainability over time?" Ancillary questions pertained to both "adaptation planning" and "adaptation practices". The background section of the proposed rulemaking includes

6912-768: The Forest Service and other statutes under the United States Code . Special agents are normally plainclothes officers who carry concealed firearms, and other defensive equipment, make arrests, carry out complex criminal investigations, present cases for prosecution to U.S. Attorneys , and prepare investigative reports. All field agents are required to travel a great deal and usually maintain a case load of ten to fifteen ongoing criminal investigations at one time. Criminal investigators occasionally conduct internal and civil claim investigations. The 193 million acres (780,000 km ) of public land that are managed as national forests and grasslands are collectively known as

7040-446: The Forest Service balances resource extraction, resource protection, and providing recreation. The work includes managing 193 million acres (780,000 km ) of national forest and grasslands, including 59 million acres (240,000 km ) of roadless areas ; 14,077 recreation sites; 143,346 miles (230,693 km) of trails; 374,883 miles (603,316 km) of roads; and the harvesting of 1.5 billion trees per year. Further,

7168-502: The Forest Service fought fires on 2.996 million acres (12,120 km ) of land in 2007. The Forest Service organization includes ranger districts, national forests, regions, research stations and research work units and the Northeastern Area Office for State and Private Forestry. Each level has responsibility for a variety of functions. The Chief of the Forest Service is a career federal employee who oversees

7296-401: The Forest Service led to Lassie receiving numerous awards and citations from the U.S. Senate and the Department of Agriculture, and was partly responsible for a bill regarding soil and water pollution that was signed into law in early 1968 by President Lyndon Johnson , which was dubbed by some as "The Lassie Program". In the 2019 family comedy movie Playing With Fire , John Cena plays

7424-691: The Garmat Ali River in Iraq since 2008 ), Europe (since 1859 in England), and North America (U.S. and Canada: Thunder Bay in Ontario since 2001, British Columbia since July 2007 ), most likely inadvertently during human activity. It can reach concentrations greater than 500,000 per square metre (46,000/sq ft), endangering the food chain by outcompeting native snails and water insects for food, leading to sharp declines in native populations. There

7552-399: The Great Lakes is as high as 70 percent. As young steelhead transition from freshwater to saltwater, a process called " smoltification " occurs where the trout undergoes physiological changes to allow it to survive in seawater. There are genetic differences between freshwater and steelhead populations that may account for the smoltification in steelhead. Juvenile steelhead may remain in

7680-692: The Interior . In 1901, the Division of Forestry was renamed the Bureau of Forestry . The Transfer Act of 1905 transferred the management of forest reserves from the United States General Land Office of the Interior Department to the Bureau of Forestry, henceforth known as the United States Forest Service . Gifford Pinchot was the first United States Chief Forester in the Presidency of Theodore Roosevelt . A historical note to include

7808-577: The Kamchatka Steelhead Project, a 20-year (1994–2014) scientific program to study and conserve the present condition of Kamchatkan steelhead ("mikizha"), a species listed in the Red Data Book of Russia . Other high-profile organizations involved in rainbow trout conservation include California Trout , which protects wild trout and other salmonids in the waters of California. The Steelhead Society of British Columbia promotes

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7936-521: The Nation's forests and grasslands to meet the needs of present and future generations. Its motto is "Caring for the land and serving people." As the lead federal agency in natural resource conservation, the Forest Service provides leadership in the protection, management, and use of the nation's forest, rangeland, and aquatic ecosystems. The agency's ecosystem approach to management integrates ecological, economic, and social factors to maintain and enhance

8064-582: The National Forest System. These lands are located in 44 states, Puerto Rico, and the Virgin Islands and comprise about 9% of the total land area in the United States. The lands are organized into 155 national forests and 20 national grasslands. The mission of the National Forest System is to protect and manage the forest lands so they best demonstrate the sustainable multiple-use management concept, using an ecological approach, to meet

8192-824: The Pacific basin, from the Kamchatka Peninsula in Russia, east along the Aleutian Islands , throughout southwest Alaska, the Pacific coast of British Columbia and southeast Alaska, and south along the west coast of the U.S. to northern Mexico. It is claimed that the Mexican forms of Oncorhynchus mykiss represent the southernmost native range of any trout or salmon ( Salmonidae ), though the Formosan landlocked salmon ( O. masou formosanus ) in Asia inhabits

8320-508: The U.S. West Coast are in decline. The U.S. National Marine Fisheries Service has 15 identified distinct population segments , in Washington , Oregon , and California. Eleven of these populations are listed under the U.S. Endangered Species Act , ten as threatened and one as endangered. One distinct population segment on the Oregon coast is designated a U.S. Species of Concern . The Southern California distinct population segment , which

8448-568: The U.S. by the Environmental Protection Agency . Once the chemicals have dissipated, native trout are released into the river. Another method is to use electrofishing which enables the fish to be caught alive and harvested or re-located. This technique has been used in the Great Smokey Mountains National Park to rid it of rainbow trout that were introduced in the 1930s and have thrived ever since. They are hoping to re-establish native brook trout in at least some of

8576-475: The U.S., Iran, Turkey, the United Kingdom, and Lesotho . While the U.S. rainbow trout industry as a whole is viewed as ecologically responsible, trout raised elsewhere are not necessarily farmed with the same methods. About three-quarters of U.S. production comes from Idaho, particularly the Snake River area, due in part to the quality and temperature of the water available there. California and Washington also produce significant numbers of farmed trout. In

8704-511: The U.S., and nearly all domestic production is consumed within the country; very little is exported. The U.S. produces about 7 percent of the world's farmed trout. Rainbow trout, especially those raised in farms and hatcheries, are susceptible to enteric redmouth disease . A considerable amount of research has been conducted on redmouth disease, given its serious implications for rainbow trout farming. The disease does not infect humans. There have been recent interest and efforts in introducing

8832-428: The U.S., there are hundreds of hatcheries operated by the United States Fish and Wildlife Service and various state agencies and tribal governments propagating rainbow trout for conservation and recreational sport fishing. Six of ten Canadian provinces have rainbow trout farms, with Ontario leading production. Rainbow trout are commercially farmed in many countries throughout the world. The practice began in

8960-433: The USFS to administer National Monuments inside of preexisting National Forests. The Forest Service also manages Grey Towers National Historic Site in Milford, Pennsylvania , the home and estate of its first Chief, Gifford Pinchot . By 1935, the U.S. Forest Service's fire management policy stipulated that all wildfires were to be suppressed by 10 am the morning after they were first spotted. In August 1944, to reduce

9088-426: The agency would have to put $ 400 to $ 500 million in wildfire prevention projects on hold because funding for firefighting was running low as the fiscal year ended. The decision was meant to preserve resources for fighting active fires burning in California, Oregon, Washington and Idaho. Politicians of both parties indicated they believed the then-current funding structure was broken, but did not agree on steps to fix

9216-646: The agency. The Chief reports to the Under Secretary for Natural Resources and Environment in the U.S. Department of Agriculture, an appointee of the President confirmed by the Senate. The Chief's staff provides broad policy and direction for the agency, works with the Administration to develop a budget to submit to Congress, provides information to Congress on accomplishments, and monitors activities of

9344-642: The agency. There are five deputy chiefs for the following areas: National Forest System, State and Private Forestry, Research and Development, Business Operations, and Finance. The Forest Service Research and Development deputy area includes five research stations, the Forest Products Laboratory , and the International Institute of Tropical Forestry , in Puerto Rico. Station directors, like regional foresters, report to

9472-433: The bottom of rivers and streams in late winter. It is not considered a significant human health risk, but it can affect stream habitats and sources of food for fish, including rainbow trout, and make recreational activities unpleasant. Even though it is native in North America, it is considered a nuisance organism or invasive species. Enteric redmouth disease is a bacterial infection of freshwater and marine fish caused by

9600-478: The boundaries of the forest. There are local ranger district offices in Aurora , Cook , Ely , Grand Marais , and Tofte . The forest covers 3.9 million acres (6,100 mi or 16,000 km), and has over 445,000 acres (1,800 km) of water. Its waters include some 2,000 lakes and rivers, more than 1,300 miles (2,100 km) of cold water streams, and 950 miles (1,530 km) of warm water streams. Many of

9728-485: The case of the westslope cutthroat trout ( O. clarki lewisi ), hybridization with introduced rainbow and Yellowstone cutthroat trout ( O. clarki bouvieri ) is threatening the westslope cutthroat trout with genomic extinction . Such introductions into the ranges of redband trout ( O. m. gairdneri , newberrii , and stonei ) have severely reduced the range of pure stocks of these subspecies, making them "species of concern" in their respective ranges. Within

9856-437: The conclusion of its performance audit . The Forest Service remains a part of the USDA. As of 2019, FY 2020 Forest Service total budget authority is $ 5.14 billion, a decrease of $ 815 million from 2019. The budget includes $ 2.4 billion for Wildland Fire Management, a decrease of $ 530 million from the 2019 Annualized Continuing Resolution because the "fire fix" cap adjustment becomes available in FY 2020, while

9984-633: The current Eastern Region was created from the former Eastern and North Central regions. ). Each encompasses a broad geographic area and is headed by a regional forester who reports directly to the Chief. The regional forester has broad responsibility for coordinating activities among the various forests within the region, for providing overall leadership for regional natural resource and social programs, and for coordinated regional land use planning. The Forest Service oversees 155 national forests, 20 grasslands, and one tall-grass prairie. Each administrative unit typically comprises several ranger districts, under

10112-491: The diverse needs of people. The goal of the State and Private Forestry program is to assist with financial and technical assistance to private landowners, state agencies, tribes, and community resource managers. It provides assistance by helping sustain the United States' urban and rural forests and their associated communities from wildland fires, insects, disease, and invasive organisms. Approximately 537 staff are employed in

10240-456: The east, Pennsylvania , North Carolina and West Virginia have farming operations. Rainbow trout farming is one of the largest finfish aquaculture industries in the U.S. They are raised inland in facilities where raceways or ponds have continuously flowing water with little pollution and a low risk of escape. The U.S. industry is noted for using best management practices . Imports constitute only about 15 percent of farmed rainbows sold in

10368-407: The eggs of other rainbow trout. Rainbows also consume decomposing flesh from the carcasses of other fish. They have even been observed to have consumed hatchling snakes, such as the barred grass snake ( Natrix helvetica ). Adult steelhead in the ocean feed primarily on other fish, squid and amphipods . The native range of Oncorhynchus mykiss is in the coastal waters and tributary streams of

10496-671: The first federal fish hatchery in the National Fish Hatchery System , was established on Campbell Creek, a McCloud River tributary. The McCloud River hatchery indiscriminately mixed coastal rainbow trout eggs with the eggs of local McCloud River redband trout ( O. m. stonei ) . Eggs from the McCloud hatchery were also provided to the San Leandro hatchery, thus making the origin and genetic history of hatchery-bred rainbow trout somewhat diverse and complex. In

10624-463: The fish, mykizha . The name of the genus is from the Greek ὄγκος ( ónkos ) "lump, bend, hook" and ῥύγχος ( rhúnkhos ) " snout ", in reference to the hooked jaws of males in the mating season (the " kype "). Sir John Richardson , a Scottish naturalist, named a specimen of this species Salmo gairdneri in 1836 to honor Meredith Gairdner, a Hudson's Bay Company surgeon at Fort Vancouver on

10752-670: The forest that are upstream of the Boundary Waters Canoe Area Wilderness. The moratorium protects the waters of the Rainy River watershed from pollution and blocks the proposed Twin Metals mine . [REDACTED] Media related to Superior National Forest at Wikimedia Commons Parts of this article were taken from the Forest Service website. As a work of the U.S. federal government ,

10880-477: The forests. These values and resources include grazing , timber , mining , recreation , wildlife habitat, and wilderness . Because of continuing development elsewhere, the large size of National Forests have made them de facto wildlife reserves for a number of rare and common species. In recent decades, the importance of mature forest for the spotted owl and a number of other species led to great changes in timber harvest levels. Rainbow trout This

11008-544: The funding allocation. During the 2019–2020 bushfires in Australia, the US Forest Services sent a contingent of firefighters. They worked alongside firefighters from other American fire departments. In April 2023, the U.S. Forest Service published a proposed rulemaking in response to climate change on the topic of improving climate resilience on the public lands that it manages. The agency introduced

11136-825: The future. The report is entitled "Managing the Impacts of Wildfire on Communities and the Environment: A Report to the President In Response to the Wildfires of 2000"—The National Fire Plan for short. The National Fire Plan continues to be an integral part of the Forest Service today. The following are important operational features of the National Fire Plan: In August 2014, Tom Vilsack, the Secretary of Agriculture, announced that

11264-468: The impassable barriers; a 2007 genetic study of fin samples collected from steelhead at 20 different sites both above and below passage barriers in the watershed found that although 30 million hatchery trout were stocked in the river from 1911 to 1925, the steelhead remain of native and not hatchery origin. Releases of conventionally reared hatchery steelhead pose ecological risks to wild steelhead populations. Hatchery steelhead are typically larger than

11392-544: The introduced rainbow trout disrupt local ecosystems and outcompete or prey upon indigenous fishes. Other introductions to support sport angling in waters either devoid of fish or with seriously depleted native stocks have created world-class fisheries such as in the Firehole River in Yellowstone National Park and in the Great Lakes . The International Game Fish Association recognizes

11520-621: The lakes are located in depressions formed by the differential erosion of tilted layers of bedded rock; these depressions were given their final form by glacial scouring during recent ice ages . The forest is located on part of the Canadian Shield . The area is on a low plateau which is part of the Superior Upland . High points include the Sawtooth Mountains , a range of hills along the shore of Lake Superior ,

11648-506: The largest population of gray wolves in the lower 48 states, with approximately 300-400 wolves within the boundaries of this forest. Ely's International Wolf Center protects all North American gray wolves from extinction. Located at the northern edge of the range of the hummingbird and near the southern edge of the range of the Canada jay , this forest has 163 nesting species of birds, the largest number of any national forest. Species include

11776-546: The late 19th century, and since the 1950s commercial production has grown dramatically. Worldwide, in 2007, 604,695 tonnes (666,562 short tons) of farmed rainbow trout were harvested with a value of about US$ 2.6 billion. The largest producer is Chile. In Chile and Norway, sea cage production of steelhead has expanded to supply export markets. Inland production of rainbow trout to supply domestic markets has increased in countries such as Italy, France, Germany, Denmark, and Spain. Other significant trout-producing countries include

11904-835: The length of the body. Adult fish have a broad reddish stripe along the lateral line, from gills to the tail, which is most pronounced in breeding males. The caudal fin is squarish and only mildly forked. Lake-dwelling and anadromous forms are usually more silvery in color with the reddish stripe almost completely gone. Juvenile rainbow trout display parr marks (dark vertical bars) typical of most salmonid juveniles. In some redband and golden trout forms, parr marks are typically retained into adulthood. Some coastal rainbow trout ( O. m. irideus ) and Columbia River redband trout ( O. m. gairdneri ) populations and cutbow hybrids may also display reddish or pink throat markings similar to cutthroat trout. In many regions, hatchery-bred trout can be distinguished from native trout via fin clips . Fin clipping

12032-473: The most numerous trees in the forest. Characteristic aquatic plants include water lilies and wild rice . Fish species such as walleye , northern pike , smallmouth bass , lake trout , brook trout , rainbow trout , and brown trout can be found in abundance in the forest's waters. Larger wildlife species include northern woodlands white-tailed deer , western moose , Canadian lynx , eastern black bear , and eastern wolf packs . Northern Minnesota has

12160-616: The most widely recognized slogans in the United States. According to the Advertising Council , Smokey Bear is the most recognized icons in advertising history and has appeared almost everywhere via Public Service Announcements in print, radio, television. Smokey Bear, an icon protected by law, is jointly owned by the Forest Service, the Ad Council and the National Association of State Foresters . In 1965, at

12288-835: The national policy for retaining public land for federal ownership. Significant federal legislation affecting the Forest Service includes the Weeks Act of 1911, the Taylor Grazing Act of 1934 , P.L. 73-482; the Multiple Use – Sustained Yield Act of 1960 , P.L. 86-517; the Wilderness Act , P.L. 88-577; the National Forest Management Act , P.L. 94-588; the National Environmental Policy Act , P.L. 91–190;

12416-614: The need for such rulemaking as: Climate change and related stressors, such as wildfire, drought, insects and disease, extreme weather events, and chronic stress on ecosystems are resulting in increasing impacts with rapid and variable rates of change on national forests and grasslands. These impacts can be compounded by fire suppression, development in the Wildland Urban Interface (WUI), and non-climate informed timber harvest and reforestation practices. The foundational question pertained to climate adaptation : "How should

12544-543: The number of forest fires , the Forest Service and the Wartime Advertising Council began distributing fire education posters featuring a black bear . The poster campaign was a success; the black bear would later be named Smokey Bear , and would, for decades, be the "spokesbear" for the Forest Service. Smokey Bear has appeared in innumerable TV commercials; his popular catch phrase, "Only YOU can prevent forest fires"—later changed to wildfires—is one of

12672-417: The ocean. Freshwater forms that have been introduced into the Great Lakes and migrate into tributaries to spawn are also called steelhead. Adult freshwater stream rainbow trout average between 0.5 and 2.5 kilograms (1 and 5 lb), while lake-dwelling and anadromous forms may reach 9 kg (20 lb). Coloration varies widely based on subspecies , forms, and habitat . Adult fish are distinguished by

12800-458: The office of Special Agent in the Department of Agriculture to assess the quality and conditions of forests in the United States. Franklin B. Hough was appointed the head of the office. In 1881, the office was expanded into the newly formed Division of Forestry . The Forest Reserve Act of 1891 authorized withdrawing land from the public domain as forest reserves managed by the Department of

12928-426: The overall direction of a forest supervisor. Within the supervisor's office, the staff coordinates activities among districts, allocates the budget, and provides technical support to each district. Forest supervisors are line officers and report to regional foresters. The administration of individual National Forests is subdivided into Ranger Districts. The Forest Service has over 600 ranger districts. Each district has

13056-561: The pathogen Yersinia ruckeri . It is primarily found in rainbow trout and other cultured salmonids . The disease is characterized by subcutaneous hemorrhaging of the mouth, fins, and eyes. It is most commonly seen in fish farms with poor water quality. Redmouth disease was first discovered in Idaho rainbow trout in the 1950s. Some fisheries are focused on removing rainbow trout in order to reestablish native trout populations. This can be done by poisoning rivers with chemicals such as antimycin or rotenone which have been declared safe in

13184-473: The program and is administered through National Forest System regions and the Northeastern Area of the United States. The research and development (R&D) arm of the Forest Service works to improve the health and use of the United States' forests and grasslands . Research has been part of the Forest Service mission since the agency's inception in 1905. Today, Forest Service researchers work in

13312-418: The quality of the environment to meet current and future needs. Through implementation of land and resource management plans, the agency ensures sustainable ecosystems by restoring and maintaining species diversity and ecological productivity that helps provide recreation, water, timber, minerals, fish, wildlife, wilderness, and aesthetic values for current and future generations of people. The everyday work of

13440-537: The range of the Kern River golden trout of Southern California, hatchery-bred rainbows introduced into the Kern River have diluted the genetic purity of the Kern River rainbow trout (O. m. gilberti) and golden trout (O. m. aguabonita) through intraspecific breeding. The Beardslee trout ( O. m. irideus var. beardsleei ) , a genetically unique lake-dwelling variety of the coastal rainbow trout that

13568-800: The request of the Joint Chiefs of Staff , the Forest Service was commissioned by the Advanced Research Projects Agency (ARPA) to research the use of forest fire as a military weapon. A report was published in June 1970 and declassified in May 1983. In September 2000, the Departments of Agriculture and the Interior developed a plan to respond to the fires of 2000, to reduce the impacts of these wildland fires on rural communities, and to ensure sufficient firefighting resources in

13696-471: The river for one to three years before smolting and migrating to sea. Individual steelhead populations leave the ocean and migrate into their freshwater spawning tributaries at different times of the year. Two general forms exist—"summer-run steelhead" and "winter-run steelhead". Summer-run fish leave the ocean between May and October before their reproductive organs are fully mature. They mature in freshwater while en route to spawning grounds where they spawn in

13824-437: The salmonids that M. cerebralis infects ( bull trout , cutthroat trout, and anadromous forms of rainbow trout—steelhead) are already threatened or endangered, and the parasite could worsen their population decline. The New Zealand mud snail ( Potamopyrgus antipodarum ) , once endemic to New Zealand, has spread widely and has become naturalised and an invasive species in many areas including Australia, Asia (Japan, in

13952-796: The same reasons. As a consequence, some rainbow populations, particularly anadromous forms within their native range, have been classified as endangered , threatened or species of special concern by federal or state agencies. Rainbow trout, and subspecies thereof, are currently a U.S. Environmental Protection Agency -approved indicator species for acute freshwater toxicity testing. Many non-profit organizations have formed to protect, conserve and restore native rainbow trout and steelhead populations. Generally, in partnership with various universities, state, federal and tribal agencies, and private interests, these organizations sponsor projects to restore habitat, prevent habitat loss and promote awareness of threats to native trout populations. Trout Unlimited (TU)

14080-479: The same species. Like salmon, steelhead return to their original hatching grounds to spawn . Similar to Atlantic salmon, but unlike their Pacific Oncorhynchus salmonid kin, steelhead are iteroparous (able to spawn several times, each time separated by months) and make several spawning trips between fresh and salt water, although fewer than 10 percent of native spawning adults survive from one spawning to another. The survival rate for introduced populations in

14208-829: The scientific name of the rainbow trout. The previous species names irideus and gairdneri were adopted as subspecies names for the coastal rainbow and Columbia River redband trout, respectively. Anadromous forms of the coastal rainbow trout ( O. m. irideus ) or Columbia River redband trout ( O. m. gairdneri ) are commonly known as steelhead . Subspecies of Oncorhynchus mykiss are listed below as described by fisheries biologist Robert J. Behnke (2002). Resident freshwater rainbow trout adults average between 0.5 and 2.5 kg (1 and 5 lb) in riverine environments, while lake-dwelling, and anadromous forms may reach 9 kg (20 lb). Coloration varies widely between regions and subspecies. Adult freshwater forms are generally blue-green or olive green with heavy black spotting over

14336-530: The size of a human finger. In streams where rainbow trout are stocked for sport fishing, but no natural reproduction occurs, some of the stocked trout may survive and grow or "carryover" for several seasons before they are caught or perish. The oceangoing (anadromous) form, including those returning for spawning, are known as steelhead in Canada and the U.S. In Tasmania they are commercially propagated in sea cages and are known as ocean trout , although they are

14464-489: The skin on, the meat tends to hold together better. While trout sold commercially in Europe is often prepared and served this way, most trout sold commercially in the United States have the fish heads removed and have been fully or partially deboned and filleted. Medium to heavy-bodied white wines , such as chardonnay , sauvignon blanc , or pinot gris , are typical wine pairings for trout. In Mainland China since 2018, it

14592-917: The spring. Summer-run fish generally spawn in longer, more inland rivers such as the Columbia River. Winter-run fish are ready to spawn when they leave the ocean, typically between November and April, and spawn shortly after returning to fresh water. Winter-run fish generally spawn in shorter, coastal rivers typically found along the Olympic Peninsula and British Columbia coastline, and summer-run fish are found in some shorter, coastal streams. Once steelhead enter riverine systems and reach suitable spawning grounds, they spawn just like resident freshwater rainbow trout. During periods of rapid growth and aging, trout display high levels of metabolic activity. High metabolic activity has been correlated with increased levels of oxidative stress and decreased machinery repair in rainbow trout. During high oxidative stress,

14720-545: The steelhead in the streams of the Santa Clara County and Monterey Bay basins are not of hatchery origin, including the Coyote Creek , Guadalupe River , Pajaro River , Permanente Creek , Stevens Creek , San Francisquito Creek , San Lorenzo River , and San Tomas Aquino Creek basins. Natural waterfalls and two major dams have isolated Russian River steelhead from freshwater rainbow trout forms above

14848-545: The text is in the public domain . United States Forest Service The United States Forest Service ( USFS ) is an agency within the U.S. Department of Agriculture that administers the nation's 154 national forests and 20 national grasslands covering 193 million acres (780,000 km ) of land. The major divisions of the agency are the Chief's Office, National Forest System, State and Private Forestry, Business Operations, as well as Research and Development. The agency manages about 25% of federal lands and

14976-853: The trout's development into an adult, a time of intense growth, the mitochondrial membrane composition and fluidity changes, which can cause defects in the electron transport chain . These defects combined with altered machinery repair and reactive oxygen species may cause more detrimental effects on the mitochondria in the fish as it matures. Rainbow trout are predators with a varied diet and will eat nearly anything they can capture. They are not as piscivorous or aggressive as brown trout or chars . Rainbow trout, including juvenile steelhead in fresh water, routinely feed on larval , pupal , and adult forms of aquatic insects (typically caddisflies , stoneflies , mayflies and aquatic diptera ). They also eat fish eggs and adult forms of terrestrial insects (typically ants, beetles, grasshoppers, and crickets) that fall into

15104-422: The types and proportions of phospholipids. With age, the heart showed more unsaturated phospholipids, which are more susceptible to peroxidation, and thus, damage. The brain mitochondria of rainbow trout show decreased levels of docosahexaenoic acid and a lower peroxidation index, suggesting a lower susceptibility to damage by oxidative stress and a different reaction to growth compared to heart mitochondria. During

15232-409: The upstream edge of the nest, covering the eggs with the displaced gravel. As eggs are released by the female, a male moves alongside and deposits milt (sperm) over the eggs to fertilize them. The eggs usually hatch in about four to seven weeks although the time of hatching varies greatly with region and habitat. Newly hatched trout are called sac fry or alevin . In approximately two weeks, the yolk sac

15360-459: The water, as well as algae. Other prey includes small fish up to one-third of their length, crayfish , shrimp, and other crustaceans . As rainbow trout grow, the proportion of fish consumed increases in most populations. Some lake-dwelling forms may become planktonic feeders. In rivers and streams populated with other salmonid species, rainbow trout eat varied fish eggs, including those of salmon, brown and cutthroat trout, mountain whitefish , and

15488-570: The wellbeing of wild salmonids in British Columbia. In 1997, a group of approximately 40 ichthyologists, biologists and naturalists from several U.S. and Mexican institutions formed a collaborative group—Truchas Mexicanas—to study the diversity of Mexican native trout , most of which are considered subspecies of O. mykiss . Rainbow trout, primarily hatchery-raised fish of the coastal rainbow trout subspecies ( O. m. irideus ) introduced into waters inhabited with cutthroat trout, will breed with cutthroats and produce fertile hybrids called cutbows. In

15616-502: The western U.S. The exact means of transmission is unknown, but it is likely that it was introduced in water transferred with live game fish and has been spread by ship ballast or contaminated recreational equipment such as wading gear. Didymosphenia geminata , commonly known as didymo or rock snot, is a species of diatom that produces nuisance growths in freshwater rivers and streams with consistently cold water temperatures. In New Zealand, invasive didymo can form large mats on

15744-520: The wild forms and can displace wild-form juveniles from optimal habitats. The dominance of hatchery steelhead for optimal microhabitats within streams may reduce wild steelhead survival as a result of reduced foraging opportunities and increased rates of predation. Rainbow trout and steelhead are highly regarded game fish among anglers . Rainbow trout are a popular target for fly fishers , and several lure fishing methods are used. The use of lures presented via spinning, casting, or trolling techniques

15872-489: The world record for rainbow trout as a fish caught on Saskatchewan 's Lake Diefenbaker by Sean Konrad on September 5, 2009, which weighed 48 lb (22 kg). The record is controversial because the fish was a genetically modified triploid and was part of a large number of triploid rainbow trout which escaped from an aquaculture facility. Rainbow trout is sometimes used as a biological indicator for water quality in water purification facilities. Rainbow trout

16000-399: The world. The program also promotes sustainable land management overseas and brings important technologies and innovations back to the United States. The program focuses on conserving key natural resource in cooperation with countries across the world. Although a large volume of timber is logged every year, not all National Forests are entirely forested. There are tidewater glaciers in

16128-489: Was established on San Leandro Creek , a tributary of San Francisco Bay , in 1870, and trout production began in 1871. The hatchery was stocked with the locally native rainbow trout, and likely steelhead of the coastal rainbow trout subspecies ( O. m. irideus ) . The fish raised in this hatchery were shipped to hatcheries out of state for the first time in 1875, to Caledonia, New York , and then in 1876 to Northville, Michigan . In 1877, another California rainbow trout hatchery,

16256-622: Was listed as endangered in 2011, has been affected by habitat loss due to dams, confinement of streams in concrete channels, water pollution , groundwater pumping, urban heat island effects, and other byproducts of urbanization. Steelhead in the Kamchatka Peninsula are threatened by over-harvest, particularly from poaching and potential development, and are listed in the Red Data Book of Russia that documents rare and endangered species. Several studies have shown that almost all California coastal steelhead are of native origin, despite over

16384-526: Was originally a mild pathogen of brown trout in central Europe and other salmonids in northeast Asia, and the spread of the rainbow trout has greatly increased its impact. Having no innate immunity to M. cerebralis , rainbow trout are particularly susceptible, and can release so many spores that even more resistant species in the same area, such as Salmo trutta , can become overloaded with parasites and incur mortalities of 80 to 90 percent. Where M. cerebralis has become well-established, it has caused

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