"Dutch Zoo Federation" . nvdzoos.nl . NVD . Retrieved 18 August 2013 .
81-715: Dolfinarium Harderwijk , better known as the Dolfinarium , is a marine mammal park in Harderwijk , the Netherlands . It is the largest marine mammal park in Europe. Visitor numbers were steady from 2005 to 2011, numbering between 700,000 and 800,000, with only the opening of new attractions responsible for a surge in numbers. In 2012 the Dolfinarium made €12 million in sales, which was around €2,4 million lower than
162-571: A Tuath . The North Sea has provided waterway access for commerce and conquest. Many areas have access to the North Sea because of its long coastline and the European rivers that empty it. There is little documentary evidence concerning the North Sea before the Roman conquest of Britain in 43 CE, however, archaeological evidence reveals the diffusion of cultures and technologies from across or along
243-738: A challenge to their dominance of the North Sea until the 20th century. Tensions in the North Sea were again heightened in 1904 by the Dogger Bank incident . During the Russo-Japanese War , several ships of the Russian Baltic Fleet, which was on its way to the Far East, mistook British fishing boats for Japanese ships and fired on them, and then upon each other, near the Dogger Bank, nearly causing Britain to enter
324-627: A few miles per day. In the wild, orcas swim about 100 miles per day and only spend approximately 10% of their lives at the surface of the ocean. In captivity, orcas cannot swim to their necessary depth, causing sunburn and blisters. The extended exposure to open air can cause the dorsal fin to collapse. As of 2016, 63 orcas are in captivity in the U.S. Studies show that nearly all captive orcas die for reasons other than old age. Twelve orcas have died at Sea World since 1970. SeaWorld San Diego has recorded 17 orca deaths since 1971. The orcas often die from pregnancy, disease and stress. [1] The orca brain
405-435: A program called "Sleeping with dolphins" for children aged 8–12. SOS Dolfijn is an independent foundation based in the Dolfinarium dedicated to the saving of stranded porpoises, dolphins and whales. Porpoises (85%) are the most common patients at the recovery facilities in the Dolfinarium. The goal of saved animals is to let them recover and then release them into the wild again. If porpoises are deemed unfit to be released into
486-523: A rich source of energy resources, including wind and wave power . The North Sea has featured prominently in geopolitical and military affairs, particularly in Northern Europe , from the Middle Ages to the modern era. It was also important globally through the power northern Europeans projected worldwide during much of the Middle Ages and into the modern era. The North Sea was the centre of
567-717: A vast merchant marine, a large fishing fleet, powerful navy, and sophisticated financial markets made the Dutch the ascendant power in the North Sea, to be challenged by an ambitious England. This rivalry led to the first three Anglo-Dutch Wars between 1652 and 1673, which ended with Dutch victories. After the Glorious Revolution in 1688, the Dutch prince William ascended to the English throne. With unified leadership, commercial, military, and political power began to shift from Amsterdam to London. The British did not face
648-536: A volume of 54,000 cubic kilometres (13,000 cu mi). Around the edges of the North Sea are sizeable islands and archipelagos , including Shetland , Orkney , and the Frisian Islands . The North Sea receives freshwater from a number of European continental watersheds, as well as the British Isles . A large part of the European drainage basin empties into the North Sea, including water from
729-620: Is 17 °C (63 °F) in the summer and 6 °C (43 °F) in the winter. The average temperatures have been trending higher since 1988, which has been attributed to climate change . Air temperatures in January range on average between 0 and 4 °C (32 and 39 °F) and in July between 13 and 18 °C (55 and 64 °F). The winter months see frequent gales and storms. The salinity averages between 34 and 35 grams per litre (129 and 132 g/US gal) of water. The salinity has
810-466: Is a series of asymmetrical trenches between 20 and 30 kilometres (12 and 19 mi) long, one and two kilometres (0.6 and 1.2 mi) wide and up to 230 metres (750 ft) deep. Other areas which are less deep are Cleaver Bank , Fisher Bank and Noordhinder Bank . The International Hydrographic Organization defines the limits of the North Sea as follows: On the Southwest. A line joining
891-526: Is also home to marine mammals. Common seals , grey seals , and harbour porpoises can be found along the coasts, at marine installations, and on islands. The very northern North Sea islands such as the Shetland Islands are occasionally home to a larger variety of pinnipeds including bearded , harp , hooded and ringed seals , and even walrus . North Sea cetaceans include various porpoise , dolphin and whale species. Plant species in
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#1732781041706972-528: Is among the largest and most complex of all marine mammals. Orcas appear to understand that they are in captivity under human care, and they depend on their pod mates and family for survival; it is rare for them to survive on their own. An orca named Loita at the Miami Seaquarium , captured at four years old and in captivity for almost 50 years, was set to be released but died in the summer of 2023 before she could be freed. The U.S. Congress passed
1053-721: Is bounded by the Orkney Islands and east coast of Great Britain to the west and the northern and central European mainland to the east and south, including Norway , Denmark , Germany , the Netherlands , Belgium , and France . In the southwest, beyond the Straits of Dover , the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via
1134-419: Is divided into several areas for different species or wider groups of animals. The animals in some areas perform in shows. The park has numerous restaurants, shops and playgrounds and a beach located on lake Wolderwijd . An in-park hotel is planned. In cooperation with a foundation, the Dolfinarium offers therapeutic sessions with dolphins for children with autism or Down syndrome . Commercially it offers
1215-699: Is recorded to have killed more than 100,000 people. In 1362, the Second Marcellus Flood , also known as the Grote Manndrenke , hit the entire southern coast of the North Sea. Chronicles of the time again record more than 100,000 deaths, large parts of the coast were lost permanently to the sea, including the now legendary lost city of Rungholt . In the 20th century, the North Sea flood of 1953 flooded several nations' coasts and cost more than 2,000 lives. 315 citizens of Hamburg died in
1296-536: Is the Norwegian trench , which extends parallel to the Norwegian shoreline from Oslo to an area north of Bergen . It is between 20 and 30 kilometres (12 and 19 mi) wide and has a maximum depth of 725 metres (2,379 ft). The Dogger Bank , a vast moraine , or accumulation of unconsolidated glacial debris, rises to a mere 15 to 30 m (50 to 100 ft) below the surface. This feature has produced
1377-559: Is thus seen as a combination of a public aquarium and an amusement park . Marine mammal parks are different from marine parks , which include natural reserves and marine wildlife sanctuaries such as coral reefs, particularly in Australia. Sea Lion Park opened in 1895 at Coney Island in Brooklyn , New York with an aquatic show featuring 40 sea lions . It closed in 1903. The second marine mammal park, then called an oceanarium ,
1458-476: The Animal Welfare Act of 1966 to protect animals who are under human care. The Marine Mammal Protection Act , signed into law in 1972 by President Richard Nixon , prohibits the capture of marine mammals. North Sea Download coordinates as: The North Sea lies between Great Britain , Denmark , Norway , Germany , the Netherlands , Belgium and France . An epeiric sea on
1539-518: The Baltic Sea . The largest and most important rivers flowing into the North Sea are the Elbe and the Rhine – Meuse . Around 185 million people live in the catchment area of the rivers discharging into the North Sea encompassing some highly industrialized areas. For the most part, the sea lies on the European continental shelf with a mean depth of 90 metres (300 ft). The only exception
1620-525: The Battle of Heligoland Bight , the Battle of the Dogger Bank , and the Battle of Jutland . World War I also brought the first extensive use of submarine warfare , and a number of submarine actions occurred in the North Sea. The Second World War also saw action in the North Sea, though it was restricted more to aircraft reconnaissance and action by fighter/bomber aircraft, submarines and smaller vessels such as minesweepers and torpedo boats . After
1701-528: The English Channel was triggered by the earthquake, which in turn caused a tsunami. The tsunami triggered by the 1755 Lisbon earthquake reached Holland, although the waves had lost their destructive power. The largest earthquake ever recorded in the United Kingdom was the 1931 Dogger Bank earthquake , which measured 6.1 on the Richter magnitude scale and caused a small tsunami that flooded parts of
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#17327810417061782-644: The European continental shelf , it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Sea in the north. It is more than 970 kilometres (600 mi) long and 580 kilometres (360 mi) wide, covering 570,000 square kilometres (220,000 sq mi). It hosts key north European shipping lanes and is a major fishery . The coast is a popular destination for recreation and tourism in bordering countries, and
1863-517: The Last Glacial Maximum when the sea began to flood the European continental shelf. In 2006 a bone fragment was found while drilling for oil in the North Sea. Analysis indicated that it was a Plateosaurus from 199 to 216 million years ago. This was the deepest dinosaur fossil ever found and the first find for Norway. Copepods and other zooplankton are plentiful in the North Sea. These tiny organisms are crucial elements of
1944-965: The Latin names Mare Germanicum and Oceanus Germanicus , and these persisted in use until the First World War. Other common names in use for long periods were the Latin terms Mare Frisicum , as well as the English equivalent, "Frisian Sea". The modern names of the sea in the other local languages are: Danish : Vesterhavet , lit. 'West Sea' [ˈvestɐˌhɛˀvð̩] or Nordsøen [ˈnoɐ̯ˌsøˀn̩] , Dutch : Noordzee , Dutch Low Saxon : Noordzee , French : Mer du Nord , West Frisian : Noardsee , German : Nordsee , Low German : Noordsee , North Frisian : Weestsiie , lit. 'West Sea', Swedish : Nordsjön , Bokmål : Nordsjøen [ˈnûːrˌʂøːn] , Nynorsk : Nordsjøen , Scots : North Sea and Scottish Gaelic : An Cuan
2025-472: The North Sea flood of 1962 . Though rare, the North Sea has been the site of a number of historically documented tsunamis . The Storegga Slides were a series of underwater landslides, in which a piece of the Norwegian continental shelf slid into the Norwegian Sea. The immense landslips occurred between 8150 BCE and 6000 BCE, and caused a tsunami up to 20 metres (66 ft) high that swept through
2106-1016: The Phare de Walde (Walde Lighthouse, in France, 50°59'37"N, 1°54'53"E) and Leathercoat Point (England, 51°10'01.4"N 1°24'07.8"). northeast of Dover. On the Northwest. From Dunnet Head (58°40'20"N, 3°22'30"W) in Scotland to Tor Ness (58°47'N) in the Island of Hoy , thence through this island to the Kame of Hoy (58°55'N) on to Breck Ness on Mainland (58°58'N) through this island to Costa Head (3°14'W) and Inga Ness (59'17'N) in Westray through Westray, to Bow Head, across to Mull Head (North point of Papa Westray ) and on to Seal Skerry (North point of North Ronaldsay ) and thence to Horse Island (South point of
2187-826: The Shetland Islands). On the North. From the North point (Fethaland Point) of the Mainland of the Shetland Islands, across to Graveland Ness (60°39'N) in the Island of Yell , through Yell to Gloup Ness (1°04'W) and across to Spoo Ness (60°45'N) in Unst island, through Unst to Herma Ness (60°51'N), on to the SW point of the Rumblings and to Muckle Flugga ( 60°51′N 0°53′W / 60.850°N 0.883°W / 60.850; -0.883 ) all these being included in
2268-608: The Skagerrak and Kattegat , narrow straits that separate Denmark from Norway and Sweden respectively. In the north it is bordered by the Shetland Islands , and connects with the Norwegian Sea , which is a marginal sea in the Arctic Ocean . The North Sea is more than 970 kilometres (600 mi) long and 580 kilometres (360 mi) wide, with an area of 750,000 square kilometres (290,000 sq mi) and
2349-627: The Vikings' rise . The Hanseatic League , the Dutch Republic , and the British each sought to gain command of the North Sea and access to the world's markets and resources. As Germany's only outlet to the ocean, the North Sea was strategically important through both world wars. The coast has diverse geology and geography. In the north, deep fjords and sheer cliffs mark much of its Norwegian and Scottish coastlines respectively, whereas in
2430-519: The WSPA , consider keeping whales and dolphins in captivity a form of abuse. The main argument is that whales and dolphins do not have enough freedom of movement within their artificial environments. The existence of marine mammal parks is thus very controversial. Although sizable pools for whales and dolphins require an extraordinarily technical and financial expenditure and are thus very difficult to maintain, many marine mammal parks endeavour to improve
2511-463: The food chain supporting many species of fish. Over 230 species of fish live in the North Sea. Cod , haddock , whiting , saithe , plaice , sole , mackerel , herring , pouting , sprat , and sandeel are all very common and are fished commercially. Due to the various depths of the North Sea trenches and differences in salinity, temperature, and water movement, some fish such as blue-mouth redfish and rabbitfish reside only in small areas of
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2592-535: The littoral is low and marshy. The east coast and south-east of the North Sea ( Wadden Sea ) have coastlines that are mainly sandy and straight owing to longshore drift , particularly along Belgium and Denmark. The southern coastal areas were originally flood plains and swampy land. In areas especially vulnerable to storm surges, people settled behind elevated levees and on natural areas of high ground such as spits and geestland . As early as 500 BC, people were constructing artificial dwelling hills higher than
2673-741: The 13th century the Hanseatic League , though centred on the Baltic Sea , started to control most of the trade through important members and outposts on the North Sea. The League lost its dominance in the 16th century, as neighbouring states took control of former Hanseatic cities and outposts. Their internal conflict prevented effective cooperation and defence. As the League lost control of its maritime cities, new trade routes emerged that provided Europe with Asian, American, and African goods. The 17th century Dutch Golden Age saw Dutch maritime power at its zenith. Important overseas colonies,
2754-583: The British coast. Shallow epicontinental seas like the current North Sea have since long existed on the European continental shelf . The rifting that formed the northern part of the Atlantic Ocean during the Jurassic and Cretaceous periods, from about 150 million years ago , caused tectonic uplift in the British Isles. Since then, a shallow sea has almost continuously existed between
2835-431: The Dolfinarium announced to decrease the number of dolphins at the park, citing that the population had gotten too large. It also announced a new playground for children. The number of visitors decreased to 586,300 in 2016. In 2018 the Dolfinarium opened a new attraction and turned a profit for the first time in five years. The park is open each year from spring to autumn, with winter being reserved for maintenance. The park
2916-406: The Dolfinarium of the rescue, upkeep, and transport of Morgan to Spain were over €1 million. Dutch broadcaster Nickelodeon aired a show intended for children called Spetter! during 2006. The show was based around the dolphin called Spetter in the Dolfinarium. Spetter was the first dolphin born by artificial insemination in the Dolfinarium. While shooting the series, a plastic model of the dolphin
2997-492: The Dolfinarium. Marine mammal park A marine mammal park (also known as marine animal park and sometimes oceanarium ) is a commercial theme park or aquarium where marine mammals such as dolphins , beluga whales and sea lions are kept within water tanks and displayed to the public in special shows. A marine mammal park is more elaborate than a dolphinarium , because it also features other marine mammals and offers additional entertainment attractions. It
3078-563: The Dolfinarium. After her recuperation opinions were split between those who wanted to return her to nature, and those who saw no chance of Morgan surviving in nature and thus wished her to go Loro Parque , Tenerife, Spain, where she could be better taken care of. The Dolfinarium wished to see Morgan go to the Loro Parque as well. Those who wished to see Morgan return to nature united in the Orca Coalition. Sentiments ran high and in
3159-467: The Icelandic orca Gudrun was added to the collection. At the end of the decade the Dolfinarium started setting up dependencies abroad. As these dependencies did not have financial success, the Dolfinarium went bankrupt in 1982. At the insistence of the mayor of Harderwijk a new foundation was set up to continue the Dolfinarium and in 1984 the shares of the company were sold to a new owner. In 1987 Gudrun
3240-508: The Middle Ages through the 15th century, the northern European coastal ports exported domestic goods, dyes, linen, salt, metal goods and wine. The Scandinavian and Baltic areas shipped grain, fish, naval necessities, and timber. In turn, the North Sea countries imported high-grade cloths, spices, and fruits from the Mediterranean region. Commerce during this era was mainly conducted by maritime trade due to underdeveloped roadways. In
3321-486: The Netherlands. The North Sea Floods of 1953 and 1962 were the impetus for further raising of the dikes as well as the shortening of the coast line so as to present as little surface area as possible to the punishment of the sea and the storms. Currently, 27% of the Netherlands is below sea level protected by dikes, dunes, and beach flats. Coastal management today consists of several levels. The dike slope reduces
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3402-926: The North Sea are home to nature reserves including the Ythan Estuary , Fowlsheugh Nature Preserve, and Farne Islands in the UK and the Wadden Sea National Parks in Denmark, Germany and the Netherlands. These locations provide breeding habitat for dozens of bird species. Tens of millions of birds make use of the North Sea for breeding, feeding, or migratory stopovers every year. Populations of black-legged kittiwakes , Atlantic puffins , northern gannets , northern fulmars , and species of petrels , seaducks , loons (divers), cormorants , gulls , auks , and terns , and many other seabirds make these coasts popular for birdwatching . The North Sea
3483-618: The North Sea area; thence up the meridian of 0°53' West to the parallel of 61°00' North and eastward along this parallel to the coast of Norway, the whole of Viking Bank is thus included in the North Sea. On the East. The Western limit of the Skagerrak [A line joining Hanstholm ( 57°07′N 8°36′E / 57.117°N 8.600°E / 57.117; 8.600 ) and the Naze ( Lindesnes , 58°N 7°E / 58°N 7°E / 58; 7 )]. The average temperature
3564-523: The North Sea during the Migration Period . They made successive invasions of the island from what is now the Netherlands, Denmark, and Germany. The Viking Age began in 793 with the attack on Lindisfarne ; for the next quarter-millennium, the Vikings ruled the North Sea. In their superior longships , they raided, traded, and established colonies and outposts along the coasts of the sea. From
3645-613: The North Sea include species of wrack , among them bladder wrack , knotted wrack , and serrated wrack. Algae , macroalgal, and kelp , such as oarweed and laminaria hyperboria, and species of maerl are found as well. Eelgrass , formerly common in the entirety of the Wadden Sea, was nearly wiped out in the 20th century by a disease. Similarly, sea grass used to coat huge tracts of ocean floor, but have been damaged by trawling and dredging have diminished its habitat and prevented its return. Invasive Japanese seaweed has spread along
3726-500: The North Sea to Great Britain and Scandinavia and reliance by some prehistoric cultures on fishing, whaling, and seaborne trade on the North Sea. The Romans established organised ports in Britain, which increased shipping and began sustained trade the diffusion of cultures and technologies from across or along the North Sea to Great Britain and Scandinavia and reliance by some prehistoric cultures on fishing, whaling, and seaborne trade on
3807-416: The North Sea until the 20th century, when numbers declined due to overfishing . Other factors like the introduction of non-indigenous species , industrial and agricultural pollution , trawling and dredging , human-induced eutrophication , construction on coastal breeding and feeding grounds, sand and gravel extraction, offshore construction , and heavy shipping traffic have also contributed to
3888-590: The North Sea, having the greatest effect on Scotland and the Faeroe Islands . The Dover Straits earthquake of 1580 is among the first recorded earthquakes in the North Sea measuring between 5.6 and 5.9 on the Richter scale. This event caused extensive damage in Calais both through its tremors and possibly triggered a tsunami , though this has never been confirmed. The theory is a vast underwater landslide in
3969-453: The North Sea. Crustaceans are also commonly found throughout the sea. Norway lobster , deep-water prawns , and brown shrimp are all commercially fished, but other species of lobster , shrimp , oyster , mussels and clams all live in the North Sea. Recently non-indigenous species have become established including the Pacific oyster and Atlantic jackknife clam . The coasts of
4050-517: The North Sea. The Romans established organised ports in Britain, which increased shipping and began sustained trade and many Scandinavian tribes participated in raids and wars against the Romans and Roman coinage and manufacturing were important trade goods. When the Romans abandoned Britain in 410, the Germanic Angles , Frisians , Saxons , and Jutes began the next great migration across
4131-500: The North Sea. The wave continues to travel northward in the Atlantic Ocean, and once past the northern tip of Great Britain, the Kelvin wave turns east and south and once again enters the North Sea. The eastern and western coasts of the North Sea are jagged, formed by glaciers during the ice ages . The coastlines along the southernmost part are covered with the remains of deposited glacial sediment. The Norwegian mountains plunge into
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#17327810417064212-558: The Orkney Islands through the mid-16th century, as both Sable Island and Orkney Islands lay within their normal range. Grey whales also resided in the North Sea but were driven to extinction in the Atlantic in the 17th century Other species have dramatically declined in population, though they are still found. North Atlantic right whales , sturgeon , shad , rays , skates , salmon , and other species were common in
4293-551: The coasts of the Netherlands, Belgium, Germany, and Denmark and low-lying areas of eastern England particularly around The Wash and Fens . Storm surges are caused by changes in barometric pressure combined with strong wind created wave action . The first recorded storm tide flood was the Julianenflut , on 17 February 1164. In its wake, the Jadebusen , (a bay on the coast of Germany), began to form. A storm tide in 1228
4374-498: The conditions of captivity and attempt to engage in public education as well as scientific studies. For that purpose, many marine mammal parks joined the Alliance of Marine Mammal Parks and Aquariums, an international association dedicated to a high standard of care of marine mammals. It was founded in 1987 and established offices near Washington, D.C. in 1992. One report found that there is little objective evidence to indicate that marine mammal parks further public knowledge. In 2010,
4455-435: The decline. For example, a resident orca pod was lost in the 1960s, presumably due to the peak in PCB pollution in this time period. The OSPAR commission manages the OSPAR convention to counteract the harmful effects of human activity on wildlife in the North Sea, preserve endangered species , and provide environmental protection. All North Sea border states are signatories of the MARPOL 73/78 Accords, which preserve
4536-430: The end a Dutch judge decided that Morgan should be transported to Loro Parque. Morgan was moved to Loro Parque on 29 November 2011. The Dutch police provided an escort from the Dolfinarium to Schiphol Airport . The date of the transport had been kept secret as the city of Harderwijk feared confrontations between opposers of the transport and police. The city had issued an emergency ban on 'Free Morgan' protests. The costs to
4617-555: The energy of the incoming sea, so that the dike itself does not receive the full impact. Dikes that lie directly on the sea are especially reinforced. The dikes have, over the years, been repeatedly raised, sometimes up to 9 metres (30 ft) and have been made flatter to better reduce wave erosion. Where the dunes are sufficient to protect the land behind them from the sea, these dunes are planted with beach grass ( Ammophila arenaria ) to protect them from erosion by wind, water, and foot traffic. Storm surges threaten, in particular,
4698-508: The finest fishing location of the North Sea. The Long Forties and the Broad Fourteens are large areas with roughly uniform depth in fathoms (forty fathoms and fourteen fathoms or 73 and 26 m or 240 and 85 ft deep, respectively). These great banks and others make the North Sea particularly hazardous to navigate, which has been alleviated by the implementation of satellite navigation systems . The Devil's Hole lies 320 kilometres (200 mi) east of Dundee , Scotland. The feature
4779-420: The highest variability where there is fresh water inflow, such as at the Rhine and Elbe estuaries, the Baltic Sea exit and along the coast of Norway. The main pattern to the flow of water in the North Sea is an anti-clockwise rotation along the edges. The North Sea is an arm of the Atlantic Ocean receiving the majority of ocean current from the northwest opening, and a lesser portion of warm current from
4860-431: The marine environment by preventing pollution from ships. Germany, Denmark, and the Netherlands also have a trilateral agreement for the protection of the Wadden Sea , or mudflats , which run along the coasts of the three countries on the southern edge of the North Sea. The North Sea has had various names throughout history. One of the earliest recorded names was Septentrionalis Oceanus , or "Northern Ocean", which
4941-776: The orca named Wanda died after two days. The Vancouver Aquarium had the second orca held alive in captivity, Moby Doll , for three months in 1964. Between the 1970s and the 1990s, technical advances and the public's increasing interest in aquatic environments prompted a shift to large marine mammal parks with cetaceans (mostly orcas and other species of dolphin) as attractions. Within this time, SeaWorld USA emerged, with operations in Orlando, Florida , San Diego, California , San Antonio, Texas and Aurora, Ohio (the Ohio location has since ceased operations). On July 13, 1865, P. T. Barnum 's museum in New York City caught fire and killed two captive beluga whales, which were boiled alive in their tank. Many animal welfare groups, such as
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#17327810417065022-406: The park underwent major renovation for the fiftieth anniversary of the park. During the boreal winter of 2012–2013, further renovations, including refurbishment of the old dome, were made. On 17 December 2014 the director of the Dolfinarium said that the ownership of the Dolfinarium would likely pass from Compagnie des Alpes to Aspro Parks , with negotiations being in the final stages. In 2016
5103-404: The park was opened to the general public. The goal of the park according to Frits was to "make the Dutch population show respect for these most special and mythical sea mammals". In 1969 the characteristic dome was built, and in the year after opening the Dolfinarium welcomed one million visitors. In the seventies the Dolfinarium expanded its collection of animals and built more enclosures. In 1976
5184-581: The practice of keeping animals in captivity as trained show performers was heavily criticized when a trainer was killed by an orca whale at SeaWorld Orlando in Florida . Orca attacks were documented in the 2013 film Blackfish . In 2015, the California Coastal Commission banned the breeding of captive killer whales. Animal captivity is the capturing and holding of an animal. Animals have been held captive for entertainment purposes and domestication. As of 2016, 63 whales and dolphins who are held captive have significantly less space than they would have in
5265-434: The prevailing flood levels. It was only around the beginning of the High Middle Ages , in 1200 AD, that inhabitants began to connect single ring dikes into a dike line along the entire coast, thereby turning amphibious regions between the land and the sea into permanent solid ground. The modern form of the dikes supplemented by overflow and lateral diversion channels, began to appear in the 17th and 18th centuries, built in
5346-410: The sea creating deep fjords and archipelagos . South of Stavanger, the coast softens, the islands become fewer. The eastern Scottish coast is similar, though less severe than Norway. From north east of England , the cliffs become lower and are composed of less resistant moraine , which erodes more easily, so that the coasts have more rounded contours. In the Netherlands, Belgium and in East Anglia
5427-413: The shores of the sea clogging harbours and inlets and has become a nuisance. Due to the heavy human populations and high level of industrialization along its shores, the wildlife of the North Sea has suffered from pollution, overhunting, and overfishing. Flamingos and pelicans were once found along the southern shores of the North Sea, but became extinct over the second millennium. Walruses frequented
5508-406: The smaller opening at the English Channel. These tidal currents leave along the Norwegian coast. Surface and deep water currents may move in different directions. Low salinity surface coastal waters move offshore, and deeper, denser high salinity waters move inshore. The North Sea located on the continental shelf has different waves from those in deep ocean water. The wave speeds are diminished and
5589-557: The south, the coast consists mainly of sandy beaches, estuaries of long rivers and wide mudflats . Due to the dense population, heavy industrialisation , and intense use of the sea and the area surrounding it, various environmental issues affect the sea's ecosystems. Adverse environmental issues – commonly including overfishing , industrial and agricultural runoff , dredging , and dumping, among others – have led to several efforts to prevent degradation and to safeguard long-term economic benefits. The North Sea
5670-507: The uplands of the Fennoscandian Shield and the British Isles. This precursor of the current North Sea has grown and shrunk with the rise and fall of the eustatic sea level during geologic time. Sometimes it was connected with other shallow seas, such as the sea above the Paris Basin to the south-west, the Paratethys Sea to the south-east, or the Tethys Ocean to the south. During the Late Cretaceous, about 85 million years ago , all of modern mainland Europe except for Scandinavia
5751-441: The war on the side of Japan. During the First World War , Great Britain's Grand Fleet and Germany's Kaiserliche Marine faced each other in the North Sea, which became the main theatre of the war for surface action. Britain's larger fleet and North Sea Mine Barrage were able to establish an effective blockade for most of the war, which restricted the Central Powers ' access to many crucial resources. Major battles included
5832-471: The wave amplitudes are increased. In the North Sea there are two amphidromic systems and a third incomplete amphidromic system. In the North Sea the average tide difference in wave amplitude is between zero and eight metres (26 ft). The Kelvin tide of the Atlantic Ocean is a semidiurnal wave that travels northward. Some of the energy from this wave travels through the English Channel into
5913-476: The wild, they are sent to the Bruinvisbaai or to facilities at Ecomare on the island of Texel . In 2016 the cooperation between SOS Dolfijn and the Dolfinarium stopped, with SOS Dolfijn announcing it was looking for a new location. In 2010 the Dolfinarium attracted worldwide attention when young orca Morgan was found exhausted and emaciated in the North Sea . She was rescued and sent for recovery at
5994-632: The wild. Marine mammals in captivity have demonstrated behavioral changes in response to the death or separation of a pod mate or family member. Captive dolphins are six times more likely to die than those in the wild because of the stress and poor treatment that they endure, living on average 40 years less in captivity than they would in the wild. The stress of captivity prevents dolphin reproduction, with rare exceptions. Dolphins in their natural habitat spend approximately 80% of their time deep underwater and swim about 40 miles per day. Dolphins in captivity spend about 80% of their time above water and swim just
6075-490: The year before. This was mainly due to a decline in visitor numbers because of orca Morgan leaving the park, and the park temporarily closing down due to the start of construction at the end of the year. In 1955 businessman Frits den Herder together with his brother Coen, the owner of a local shipping company and playground, started collecting sea mammals. They started by building a dolphinarium (in Dutch: dolfinarium). In 1965
6156-532: Was a scattering of islands. By the Early Oligocene , 34 to 28 million years ago , the emergence of Western and Central Europe had almost completely separated the North Sea from the Tethys Ocean, which gradually shrank to become the Mediterranean as Southern Europe and South West Asia became dry land. The North Sea was cut off from the English Channel by a narrow land bridge until that
6237-614: Was at times used so as to not exhaust the animal. A subsequent season called Spetter and the Romanov Mystery was aired by Jetix in 2007. Tess Gaerthé , Dutch contestant to the Junior Eurovision Song Contest 2005, provided the titlesong for the second season. Re-runs of the Spetter series have been shown by different RTL channels. The airing of the Spetter series led to a higher number of visitors for
6318-566: Was breached by at least two catastrophic floods between 450,000 and 180,000 years ago. Since the start of the Quaternary period about 2.6 million years ago , the eustatic sea level has fallen during each glacial period and then risen again. Every time the ice sheet reached its greatest extent, the North Sea became almost completely dry, the dry landmass being known as Doggerland , whose northern regions were themselves known to have been glaciated. The present-day coastline formed after
6399-632: Was cited by Pliny . He also noted that the Cimbri called it Morimarusa – "Dead Sea". The name "North Sea" probably came into English, however, via the Dutch Noordzee , who named it thus either in contrast with the Zuiderzee ("South Sea"), located south of Frisia , or because the sea is generally to the north of the Netherlands. Before the adoption of "North Sea", the names used in English were "German Sea" or "German Ocean", referred to as
6480-615: Was established in St. Augustine, Florida in 1938. It was initially a large water tank used to exhibit marine mammals for filming underwater movies, and only later became a public attraction. Today Marineland of Florida claims to be "the world's first oceanarium." In November 1961, Marineland of the Pacific on the Palos Verdes Peninsula near Los Angeles became the first park to display an orca in captivity , although
6561-468: Was sent to SeaWorld Orlando . In 1989 the Dolfinarium once again changed hands and the new owner invested money in the building of new attractions. The largest of the constructions was the building of a lagoon in 1997, which cost around 12 million euro. In 2001 the Dolfinarium was bought by Compagnie des Alpes , which owns another amusement park in the Netherlands, Walibi Holland , and formerly owned Avonturenpark Hellendoorn [ nl ] . In 2005
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