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37-565: The eulachon ( / ˈ j uː l ə k ɒ n / ( Thaleichthys pacificus ), also spelled oolichan / ˈ uː l ɪ k ɑː n / , ooligan / ˈ uː l ɪ ɡ ə n / , hooligan / ˈ h uː l ɪ ɡ ə n / ), or the candlefish , is a small anadromous species of smelt that spawns in some of the major river systems along the Pacific coast of North America from northern California to Alaska . The name "candlefish" derives from it being so fatty during spawning, with up to 15% of

74-728: A blueprint for the protection and recovery of the southern Distinct Population Segment (DPS) of eulachon ( Thaleichthys pacificus ) using the best available science per the requirements of the Endangered Species Act . In Canada, the Central Pacific Coast and Fraser River populations were classified as endangered by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) in 2011. At that time,

111-839: A forage fish of the smelt family found in the Atlantic and Arctic oceans. In summer, they graze on dense swarms of plankton at the edge of the ice shelf. Larger capelin also eat krill and other crustaceans . The capelin move inshore in large schools to spawn and migrate in spring and summer to feed in plankton rich areas between Iceland , Greenland and Jan Mayen . The migration is affected by ocean currents . Around Iceland maturing capelin make large northward feeding migrations in spring and summer. The return migration takes place in September to November. The spawning migration starts north of Iceland in December or January. The diagram on

148-580: A high degree of homing and the fish may make upstream or downstream migrations to reach very specific spawning locations in whitewater canyons. Sometimes fish can be dispersed by birds that eat fish eggs. They carry eggs in the digestive tracts and then deposit them in their faeces in a new place. The survival rate for fish eggs that have passed through a bird's digestive tract is low. Since prehistoric times humans have exploited certain anadromous fishes during their migrations into freshwater streams, when they are more vulnerable to capture. Societies dating to

185-412: A key to immune defense for the growing fish. The idea that these genes play an important role in development against viruses suggests they are critical in the trout's success in an anadromous lifestyle. [REDACTED] Media related to Fish migration at Wikimedia Commons Grease trail A grease trail is an overland trade route , part of a network of trails connecting the Pacific coast with

222-412: A river which has large runs sees a year with no returns; the reasons for such variability are not known. The eulachon run is characteristic for the early portion being almost entirely male, with females following about midway through the run to its conclusion. Males are easily distinguished from females during spawning by fleshy ridges which form along the length of their bodies. Indigenous communities of

259-515: Is that it was a corruption from the term "Oolichan Trail", the native trade route for oolichan oil. In some parts it is also known as "halimotkw", which can be translated as "savior fish" or "salvation fish", due to its availability for fishing often coming at the end of winter, when food supplies typically run low. The unrelated sablefish Anoplopoma fimbria is also called "candlefish" in the United Kingdom . Eulachon are distinguished by

296-801: The American eel and the European eel which migrate huge distances from freshwater rivers to spawn in the Sargasso Sea , and whose subsequent larvae can drift in currents for months and even years before returning to their natal rivers and streams as glass eels or elvers. An example of a euryhaline species is the bull shark , which lives in Lake Nicaragua of Central America and the Zambezi River of Africa. Both these habitats are fresh water, yet bull sharks will also migrate to and from

333-661: The Columbia , Fraser and Klinaklini rivers in 1994. Fish migration Fish migrations involve movements of schools of fish on a scale and duration larger than those arising during normal daily activities. Some particular types of migration are anadromous , in which adult fish live in the sea and migrate into fresh water to spawn ; and catadromous , in which adult fish live in fresh water and migrate into salt water to spawn. Marine forage fish often make large migrations between their spawning, feeding and nursery grounds. Movements are associated with ocean currents and with

370-586: The Interior in the Pacific Northwest . Trails were developed for trade between indigenous people , particularly the trade in eulachon oil (also spelled oolichan oil). The grease from these small fish could be traded for furs, copper , and obsidian , among other things. The Stó:lō people of the Fraser River simply ate the fish, either fresh or smoked, but the people of the interior used

407-601: The Millingstone Horizon are known which exploited the anadromous fishery of Morro Creek and other Pacific coast estuaries . In Nevada the Paiute tribe has harvested migrating Lahontan cutthroat trout along the Truckee River since prehistoric times. This fishing practice continues to current times, and the U.S. Environmental Protection Agency has supported research to assure the water quality in

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444-796: The Nass / Skeena Rivers population was given threatened status, but this was downgraded to Special Concern status when the Nass / Skeena Rivers population was individually reassessed by COSEWIC in 2013. As of May 2023, a decision is pending on the listing of these populations under Schedule 1 of the Species at Risk Act . Overall, the species faces multiple threats, including overharvest , pollution, loss of freshwater spawning habitat due to logging , diversion and dam construction and climate change . Canadian spawning runs have been severely depleted compared to historic levels, while abrupt declines were reported in

481-557: The National Marine Fisheries Service (NMFS) received a petition from the Cowlitz Tribe to list a distinct population segment (DPS) of eulachon from Washington , Oregon , and California , (the so-called Southern DPS) as an endangered or threatened species under the Endangered Species Act . (ESA). NMFS found that this petition presented enough information to warrant conducting a status review of

518-980: The United Nations Convention on the Law of the Sea (UNCLOS). The Convention does not provide an operational definition of the term, but in an annex (UNCLOS Annex 1) lists the species considered highly migratory by parties to the convention. The list includes: tuna and tuna-like species ( albacore , bluefin , bigeye tuna , skipjack , yellowfin , blackfin , little tunny , southern bluefin and bullet ), wahoo , pomfret , marlin , sailfish , swordfish , saury and oceangoing sharks , dolphins and other cetaceans . These high trophic level oceanodromous species undertake migrations of significant but variable distances across oceans for feeding, often on forage fish, or reproduction, and also have wide geographic distributions. Thus, these species are found both inside

555-403: The exclusive economic zones of different nations, and these are covered differently in the treaty from other fish. Salmon and striped bass are well-known anadromous fish, and freshwater eels are catadromous fish that make large migrations. The bull shark is a euryhaline species that moves at will from fresh to salt water, and many marine fish make a diel vertical migration , rising to

592-849: The high seas . Transboundary stock range in the EEZs of at least two countries. A stock can be both transboundary and straddling. It can be challenging to determine the population structure of highly migratory species using physical tagging. Traditional genetic markers such as short-range PCR products, microsatellites and SNP-arrays have struggled to identify population structure and distinguish fish stocks from separate ocean basins. However, population genomic research using RAD sequencing in yellowfin tuna, albacore, and wahoo has been able to distinguish populations from different ocean basins and reveal fine-scale population structure. Similar population genomics methods have also provided improved insight towards population structure in striped marlin . Some of

629-444: The 200-nautical-mile (370-kilometre) exclusive economic zones and in the high seas outside these zones. They are pelagic species, which means they mostly live in the open ocean and do not live near the sea floor, although they may spend part of their life cycle in nearshore waters . Highly migratory species can be compared with straddling stock and transboundary stock . Straddling stock range both within an EEZ as well as in

666-597: The Pacific Coast from California to Alaska made eulachon an important part of their diet, as well as a valuable trade item with peoples whose territories did not include spawning rivers. The species was caught using traps, rakes, and nets. The harvest continues today, with other residents taking part in the exploitation of the large runs. Today harvested eulachon are typically stored frozen and thawed as needed. They may also be fried, dried, smoked, or canned. Eulachon were also processed for their rich oil. The usual process

703-747: The Truckee can support suitable populations of the Lahontan cutthroat trout. Because salmonids live an anadromous lifestyle, they encounter a larger range of viruses from both freshwater and marine ecosystems. Myxovirus resistance (Mx) proteins are part of a GTP-ase family that aid in viral immunity, and previously, rainbow trout ( Oncorhynchus mykiss ) had been shown to possess three different Mx genes to aid in viral defence in both environments. The number of Mx genes can differ among species of fish, with numbers ranging from 1 to 9 and some outliers like Gadiformes that have totally lost their Mx genes. A study

740-399: The availability of food in different areas at different times of year. The migratory movements may partly be linked to the fact that the fish cannot identify their own offspring and moving in this way prevents cannibalism . Some species have been described by the United Nations Convention on the Law of the Sea as highly migratory species. These are large pelagic fish that move in and out of

777-615: The back extending to the top of the head, lighter to silvery white or light blue on the sides, and white on the ventral surface; speckling is extra fine, sparse, and restricted to the back. Adults can reach maximum lengths of 30 cm (12 in) but most adults are between 15 and 20 cm (6 and 8 in). Adults have striae on their operculum that aid in distinguishing Thaleichthys pacificus from other smelt. They feed on plankton but only while at sea. Eulachon feed primarily on plankton as well as fish eggs , insect larvae, ocean debris and small crustaceans. It forms an important part of

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814-503: The best-known anadromous fishes are the Pacific salmon species, such as Chinook (king), coho (silver), chum (dog), pink (humpback) and sockeye (red) salmon. These salmon hatch in small freshwater streams. From there they migrate to the sea to mature, living there for two to six years. When mature, the salmon return to the same streams where they were hatched to spawn. Salmon are capable of going hundreds of kilometers upriver, and humans must install fish ladders in dams to enable

851-481: The building of dams. As with various other aspects of fish life, zoologists have developed empirical classifications for fish migrations. The first two following terms have been in long-standing wide usage, while others are of more recent coinage. George S. Myers coined the following terms in a 1949 journal article: Although these classifications originated for fish, they can apply, in principle, to any aquatic organism. List of diadromous orders and families, and

888-474: The coast. "Because these trails were commonly used to transport Oolichan grease, they are now referred to as 'grease trails.' For thousands of years, First Nations traders followed well-trodden 'grease trails,' usually the easiest routes across plateaus, highlands and over challenging mountains far into the western interior, back-packing heavy boxes of valuable Oolichan grease, held in place by cedar rope 'tump-lines,' attached to headbands. The trails, operating on

925-468: The diet of many ocean and shore predators, and serves as a prominent food source for people living near its spawning streams. Eulachon, as anadromous fish, spend most of their adult lives in the ocean but return to their natal freshwater streams and rivers to spawn and die. As such, one stream may see regular large runs of eulachon while a neighboring stream sees few or none at all. Regular annual runs are common but not entirely predictable, and occasionally

962-407: The large canine-like teeth on the vomer bone and 19 to 31 rays in the anal fin . Like salmon and trout they have an adipose fin (aft of the dorsal); it is sickle-shaped. The paired fins are longer in male fish than in females. All fins have well-developed breeding parts (raised tissue "bumps") in ripe males, but these are poorly developed or absent in females. Adult coloration is brown or blue on

999-575: The number of known species: Forage fish often make great migrations between their spawning, feeding and nursery grounds. Schools of a particular stock usually travel in a triangle between these grounds. For example, one stock of herrings have their spawning ground in southern Norway , their feeding ground in Iceland and their nursery ground in northern Norway. Wide triangular journeys such as these may be important because forage fish, when feeding, cannot distinguish their own offspring. Capelin are

1036-534: The ocean. Specifically, Lake Nicaragua bull sharks migrate to the Atlantic Ocean and Zambezi bull sharks migrate to the Indian Ocean. Diel vertical migration is a common behavior; many marine species move to the surface at night to feed, then return to the depths during daytime. A number of large marine fishes, such as the tuna , migrate north and south annually, following temperature variations in

1073-558: The ocean. These are of great importance to fisheries . Freshwater (potamodromous) fish migrations are usually shorter, typically from lake to stream or vice versa, for spawning purposes. However, potamodromous migrations of the endangered Colorado pikeminnow of the Colorado River system can be extensive. Migrations to natal spawning grounds can easily be 100 km, with maximum distances of 300 km reported from radiotagging studies. Colorado pikeminnow migrations also display

1110-525: The oil as a condiment (similar to butter ) and in various other ways. "Grease Trail", Carrier /tl'inaɣeti/. The name comes from the fact that the most important item traded into the interior was the processed oil of the eulachon fish Thaleichthys pacificus. Indeed, the Carrier word /tl'inaɣe/ "eulachon oil" is a compound of Carrier /xe/ "grease, oil" (combining form /ɣe/) with /tl'ina/, a loan from Heiltsuk or Haisla , North Wakashan languages spoken on

1147-543: The right shows the main spawning grounds and larval drift routes. Capelin on the way to feeding grounds is coloured green, capelin on the way back is blue, and the breeding grounds are red. In a paper published in 2009, researchers from Iceland recount their application of an interacting particle model to the capelin stock around Iceland, successfully predicting the spawning migration route for 2008. The term highly migratory species (HMS) has its origins in Article 64 of

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1184-495: The salmon to get past. Other examples of anadromous fishes are sea trout , three-spined stickleback , sea lamprey and shad . Several Pacific salmon (Chinook, coho and Steelhead) have been introduced into the US Great Lakes, and have become potamodromous, migrating between their natal waters to feeding grounds entirely within fresh water. Remarkable catadromous migrations are made by freshwater eels. Examples are

1221-632: The species. Based on the status review NMFS proposed listing this species as threatened on March 13, 2009. On March 16, 2010, NOAA announced that the Southern DPS of eulachon will be listed as threatened under the ESA, effective on May 17, 2010 (See: the Federal Register notice published on May 18, 2010, at 74 FR 3178). On September 6, 2017, the NMFS approved a recovery plan intended to serve as

1258-414: The surface to feed at night and sinking to lower layers of the ocean by day. Some fish such as tuna move to the north and south at different times of year following temperature gradients. The patterns of migration are of great interest to the fishing industry. Movements of fish in fresh water also occur; often the fish swim upriver to spawn, and these traditional movements are increasingly being disrupted by

1295-527: The total body weight in fat, that if caught, dried, and strung on a wick, it can be burned as a candle. This is the name most often used by early explorers. The name eulachon (occasionally seen as oolichan , ooligan , oulachon , and uthlecan ) is from the Chinookan language and the Chinook Jargon based on that language. One of several theories for the origin of the name of the state of Oregon

1332-452: Was performed by Wang et al. (2019) to identify more potential Mx genes that resided in rainbow trout. An additional six Mx genes were identified in that study, now named Mx4-9. They also concluded that the trout Mx genes were "differentially expressed constitutively in tissues" and that this expression is increased during development. The Mx gene family is expressed at high levels in the blood and intestine during development, suggesting they are

1369-492: Was to allow the fish to decompose (rot) for a week or more in a hole in the ground, then add boiling hot water and skim off the oil, which would rise to the surface, being less dense than water. Eulachon oil (also known as "Eulachon grease") was traded with inland communities; as a result, the trails over which the trade was conducted came to be known as grease trails . Other uses of eulachon by non-Natives include bait for sportfishing and food for cats and dogs. In November 2008,

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