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| trend = decreasing
| trend = decreasing
| status_system = IUCN3.1
| status_system = IUCN3.1
| status_ref =<ref name='IUCN'>{{cite web|url=http://www.iucnredlist.org/apps/redlist/details/135717/0 |title=Platichthys flesus|accessdate=2011-07-29 |coauthors= |date= |work=[[IUCN Red List]] |publisher= [[International Union for Conservation of Nature]] |archiveurl= |archivedate= }}</ref>
| status_ref =<ref name=IUCN>{{cite web|url=http://www.iucnredlist.org/apps/redlist/details/135717/0 |title=''Platichthys flesus'' |accessdate=2013-08-31 |author=Munroe, T. A. |date=2009-02-04 |work=[[IUCN Red List]] |publisher= [[International Union for Conservation of Nature]] }}</ref>
| regnum = [[Animal]]ia
| regnum = [[Animal]]ia
| phylum = [[Chordate|Chordata]]
| phylum = [[Chordate|Chordata]]
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| species = '''''P. flesus'''''
| species = '''''P. flesus'''''
| binomial = ''Platichthys flesus''
| binomial = ''Platichthys flesus''
| binomial_authority = ([[Carl Linnaeus|Linnaeus]], [[10th edition of Systema Naturae|1758]])
| binomial_authority = ([[Carl Linnaeus|Linnaeus]], [[10th edition of Systema Naturae|1758]])<ref name=WoRMS>{{cite WoRMS |author=Bailly, Nicolas |year=2013 |title=''Platichthys flesus'' (Linnaeus, 1758) |id=127141 |accessdate=2013-08-31 }}</ref>
| synonyms =
| synonyms =
*''Flesus vulgaris'', ([[Émile Moreau (ichthyologist)|Moreau]], 1881)
*''<small>Flesus vulgaris'', ([[Émile Moreau (ichthyologist)|Moreau]], 1881)
*''Platessa carnaria'', ([[Brown]], 1830)
*''Platessa carnaria'', ([[Brown]], 1830)
*''Platessa glabra'', ([[Rathke]], 1837)
*''Platessa glabra'', ([[Rathke]], 1837)
Line 38: Line 38:
*''Pleuronectes luscus'', ([[Peter Simon Pallas|Pallas]], 1814)
*''Pleuronectes luscus'', ([[Peter Simon Pallas|Pallas]], 1814)
*''Pleuronectes passer'', ([[Linnaeus]], 1758)
*''Pleuronectes passer'', ([[Linnaeus]], 1758)
*''Pleuronectes roseus'', ([[George Shaw|Shaw]], 1796)
*''Pleuronectes roseus'', ([[George Shaw|Shaw]], 1796)</small>
| synonyms_ref = <ref name=WoRMS/>
}}
}}


The '''European flounder''' (''Platichthys flesus'') is a [[flatfish]] of [[Europe]]an [[coast]]al waters from the [[White Sea]] in North to the [[Mediterranean]] and the [[Black Sea]] in South. [[introduced species|Introduced]] into the [[USA]] and [[Canada]] accidentally through transport in ballast water. It is a well-known [[food fish]].
The '''European flounder''' (''Platichthys flesus'') is a [[flatfish]] of [[Europe]]an [[coast]]al waters from the [[White Sea]] in the north to the [[Mediterranean]] and the [[Black Sea]] in the south. It has been [[introduced species|introduced]] into the [[USA]] and [[Canada]] accidentally through transport in ballast water. It is caught and used for [[food fish|human consumption]].

The European flounder is oval in shape and is usually right-eyed. It normally grows about 30 cm in length, although lengths of up to 60 cm have been recorded. The upper surface is usually dull brown or olive in colour with reddish spots and brown blotches and this fish can change colour to suit its background, providing an effective [[camouflage]]. The underside is pearly-white, giving the fish one of its common names, the '''white fluke'''. The [[lateral line]] features rows of small [[tubercle]]s, as do the bases of the [[dorsal fin|dorsal]] and [[anal fin]]s.


==Description==
==Description==
The European flounder is a flatfish with an oval-shaped body with a width about half its length. It can grow to a maximum size of {{convert|60|cm}} with a weight of {{convert|14|kg}}, but a more usual mature length is about {{convert|50|cm}}. This fish is flattened laterally and swims and rests on one side. During development, the eyes usually migrate to the right side of the fish and what appears to be its upper surface is in reality its right side. In about thirty percent of individuals, the eyes move to the left and the left side becomes uppermost. This fish has a small mouth at the end of its bluntly pointed snout. The upper surface is fawn, olive green or pale brown with spots and larger patches of darker brown and some irregular reddish spots. The under surface is opaque pearly-white giving the fish its common name of "white fluke". The [[lateral line]] is nearly straight and runs along the middle of the upper surface, curving round the short pectoral fins. The dorsal fin runs from the base of the head to beside the [[caudal peduncle]]. It has no dorsal spines but has between 53 and 62 soft rays. The anal fin also runs the length of the body and has no spines and 37 to 46 soft rays. The skin is rough, with prickly tubercles at the base of the dorsal and anal fins, and there are large scales beside the lateral line. The caudal peduncle is about half the length of the tail and the caudal fin has a squared-off end.<ref name=FishBase>{{cite web |url=http://www.fishbase.org/summary/Platichthys-flesus.html |title=''Platichthys flesus'' (Linnaeus, 1758) |author=Luna, Susan M. |work=FishBase |publisher=FishBase |accessdate=2013-08-31}}</ref><ref name=Jenkins>{{cite book |title=The Fishes of the British Isles |last=Jenkins |first=J. Travis |year=1958 |publisher=Frederick Warne & Co. |asin=B00ABHEN6Y |pages=187–190 }}</ref>
The European flounder is oval in shape and is usually right-eyed. It usually grows to 25-30 cm in length, although lengths up to 50 cm have been recorded.

==Distribution and habitat==
The European flounder is native to the north eastern Atlantic Ocean and the Mediterranean Sea. The range extends from the [[Barents Sea]], [[White Sea]] and [[Baltic Sea]] to Greece, Turkey, the [[Black Sea]] and the North African coast. It has been introduced into Iran and has become established off the eastern coast of Canada and the United States, possibly getting there by way of [[ballast water]]. It is normally found from the low [[shore]] down to depths of about {{convert|100|m}} on sandy, shingle or muddy bottoms where its dappled colouring [[camouflage]] it and make it difficult to detect.<ref name=IUCN/>

The European flounder can also be found in [[estuary|estuaries]] where it is tolerant of low salinity levels and, unlike other species of [[Pleuronectidae]], it often spends part of its life cycle in freshwater and regularly makes its way into rivers. In the British Isles has been found as far inland as [[Montgomeryshire]] on the [[River Severn]], [[Dinas Mawddwy]] on the [[River Dovey]] and [[Garstang]] on the [[River Wyre]]. Unlike the [[Atlantic salmon]], it feeds in the rivers and makes its way out to sea again before spawning.<ref name=Jenkins/>

==Biology==
The European flounder lives and feeds on the seabed and in the waters immediately above. It is mainly nocturnal and during the day rests on the sea floor, semi-submerging itself in the [[Substrate (biology)|substrate]]. It feeds on [[Bivalvia|bivalve molluscs]] and other [[benthic]] invertebrates such as [[shrimp]]s, [[Polychaete|polychaete worms]], [[Gastropoda|gastropod molluscs]] and small fish.<ref name=FishBase/>


The European flounder leaves freshwater in the autumn and can often be caught in estuaries when the first frosts occur. Then the fish move into deeper water for the winter. In the spring it migrates to the spawning grounds, travelling at three to four miles (five to seven kilometres) per day and not eating en route. Spawning takes place between February and May being later in more northerly [[latitude]]s. The female liberates about a million eggs which are lighter than water. The male liberates sperm which also floats and both eggs and sperm rise to the surface. Here the eggs are fertilised and hatch after six to eleven days depending on the water temperature. The developing larvae are [[plankton]]ic and drift towards the coast with juvenile flounders living in shallow waters and estuaries. Young flounders become mature when still small, the males when they measure {{convert|11.5|cm}} and the females when they measure {{convert|18|cm|0|abbr=on}}.<ref name=Jenkins/> The European flounder sometimes [[hybrid]]ises with [[European plaice]] (''Pleuronectes platessa'') and, particularly in the western Baltic Sea, the hybrid is common.<ref name=FAO>{{cite web |url=http://www.fao.org/fishery/species/2550/en |title=''Platichthys flesus'' (Linnaeus, 1758) |author=Fisheries and Aquaculture Department |work=Species fact sheets |publisher=Food and Agriculture Organization of the United Nations |accessdate=2013-09-01}}</ref>
The upper surface is usually dull brown in colour with reddish-brown blotches and the underside is white. This fish can change colour to suit its background, providing an effective [[camouflage]].


==Human interactions==
The [[lateral line]] features rows of small [[tubercle]]s, as do the bases of the [[dorsal fin|dorsal]] and [[anal fin]]s.
The European flounder is used for human consumption but is not so highly esteemed as the European plaice or [[common sole]] (''Solea solea'').<ref name=Jenkins/> The most important fisheries are in the Baltic Sea and the waters around the Netherlands and Denmark. In 2010, the total world catch was about nineteen thousand tonnes, mostly caught by bottom trawling. The fish is marketed fresh and frozen and can be fried, boiled, steamed, baked or microwaved.<ref name=FAO/>


It has been found that male European flounders living in polluted estuaries may show signs of excess exposure to [[oestrogen]]s. Substances such as [[vitellogenin]]s have been identified in their blood at between four and six times the concentration found in the blood of fish from uncontaminated areas, however the flounder is less sensitive to oestrogens than is the freshwater [[rainbow trout]].<ref>{{cite journal |author= Allen, Yvonne; Scott, Alexander P.; Matthiessen, Peter; Haworth, Sarah; Thain, John E.; Feist, Steve |year=1999 |title=Survey of estrogenic activity in United Kingdom estuarine and coastal waters and its effects on gonadal development of the flounder ''Platichthys flesus'' |journal=Journal of Environmental Toxicology and Chemistry |volume=18 |issue=8 |pages=1791–1800 |doi=10.1002/etc.5620180827 }}</ref>
==Habitat==
The European flounder is usually found on muddy [[seabed]]s from the low [[shore]] to depths exceeding 50 m. It feeds on [[invertebrates]], especially [[crustacean]]s, [[worm]]s and [[mollusc]]s. The European flounder can also be found in [[estuary|estuaries]].


==External links==
==Status==
The European flounder is assessed by the [[IUCN]] in their [[Red List of Threatened Species]] as being of "[[Least Concern]]". This is because it has a large population size and extensive range, and is common in nearly all parts of its range. Numbers of fish may be decreasing somewhat but not to the extent that would warrant listing it under a higher risk category.<ref name=IUCN/>
*[http://www.marlin.ac.uk/species/Platichthysflesus.htm European flounder at marLIN]
*{{FishBase species | genus = Platichthys | species = flesus | year = 2008 | month = October}}


==References==
==References==

Revision as of 18:33, 6 September 2013

European flounder
Scientific classification
Kingdom:
Phylum:
Class:
Order:
Family:
Genus:
Species:
P. flesus
Binomial name
Platichthys flesus
Synonyms[2]
  • Flesus vulgaris, (Moreau, 1881)
  • Platessa carnaria, (Brown, 1830)
  • Platessa glabra, (Rathke, 1837)
  • Platichthys flesus bogdanovi, (Sandeberg, 1878)
  • Platichthys flesus flesus, (Linnaeus, 1758)
  • Platichthys flesus luscus, (Pallas, 1814)
  • Platichthys flesus marmorata, (Nordmann, 1840)
  • Platichthys flesus trachurus, (Duncker, 1892)
  • Pleuronectes bogdanovii, (Sandeberg, 1878)
  • Pleuronectes flesoides, (Pontoppidan, 1766)
  • Pleuronectes flesus, (Linnaeus, 1758)
  • Pleuronectes flesus baltica, (Suvorov, 1925)
  • Pleuronectes flesus caninensis, (Suvorov, 1929)
  • Pleuronectes flesus leiurus, (Duncker, 1892)
  • Pleuronectes flesus luscus, (Pallas, 1814)
  • Pleuronectes flesus septentrionalis, (Surorov, 1925)
  • Pleuronectes flesus septentrionalis, (Berg, 1949)
  • Pleuronectes flesus trachurus, (Duncker, 1892)
  • Pleuronectes italicus, (Günther, 1862)
  • Pleuronectes luscus, (Pallas, 1814)
  • Pleuronectes passer, (Linnaeus, 1758)
  • Pleuronectes roseus, (Shaw, 1796)

The European flounder (Platichthys flesus) is a flatfish of European coastal waters from the White Sea in the north to the Mediterranean and the Black Sea in the south. It has been introduced into the USA and Canada accidentally through transport in ballast water. It is caught and used for human consumption.

The European flounder is oval in shape and is usually right-eyed. It normally grows about 30 cm in length, although lengths of up to 60 cm have been recorded. The upper surface is usually dull brown or olive in colour with reddish spots and brown blotches and this fish can change colour to suit its background, providing an effective camouflage. The underside is pearly-white, giving the fish one of its common names, the white fluke. The lateral line features rows of small tubercles, as do the bases of the dorsal and anal fins.

Description

The European flounder is a flatfish with an oval-shaped body with a width about half its length. It can grow to a maximum size of 60 centimetres (24 in) with a weight of 14 kilograms (31 lb), but a more usual mature length is about 50 centimetres (20 in). This fish is flattened laterally and swims and rests on one side. During development, the eyes usually migrate to the right side of the fish and what appears to be its upper surface is in reality its right side. In about thirty percent of individuals, the eyes move to the left and the left side becomes uppermost. This fish has a small mouth at the end of its bluntly pointed snout. The upper surface is fawn, olive green or pale brown with spots and larger patches of darker brown and some irregular reddish spots. The under surface is opaque pearly-white giving the fish its common name of "white fluke". The lateral line is nearly straight and runs along the middle of the upper surface, curving round the short pectoral fins. The dorsal fin runs from the base of the head to beside the caudal peduncle. It has no dorsal spines but has between 53 and 62 soft rays. The anal fin also runs the length of the body and has no spines and 37 to 46 soft rays. The skin is rough, with prickly tubercles at the base of the dorsal and anal fins, and there are large scales beside the lateral line. The caudal peduncle is about half the length of the tail and the caudal fin has a squared-off end.[3][4]

Distribution and habitat

The European flounder is native to the north eastern Atlantic Ocean and the Mediterranean Sea. The range extends from the Barents Sea, White Sea and Baltic Sea to Greece, Turkey, the Black Sea and the North African coast. It has been introduced into Iran and has become established off the eastern coast of Canada and the United States, possibly getting there by way of ballast water. It is normally found from the low shore down to depths of about 100 metres (330 ft) on sandy, shingle or muddy bottoms where its dappled colouring camouflage it and make it difficult to detect.[1]

The European flounder can also be found in estuaries where it is tolerant of low salinity levels and, unlike other species of Pleuronectidae, it often spends part of its life cycle in freshwater and regularly makes its way into rivers. In the British Isles has been found as far inland as Montgomeryshire on the River Severn, Dinas Mawddwy on the River Dovey and Garstang on the River Wyre. Unlike the Atlantic salmon, it feeds in the rivers and makes its way out to sea again before spawning.[4]

Biology

The European flounder lives and feeds on the seabed and in the waters immediately above. It is mainly nocturnal and during the day rests on the sea floor, semi-submerging itself in the substrate. It feeds on bivalve molluscs and other benthic invertebrates such as shrimps, polychaete worms, gastropod molluscs and small fish.[3]

The European flounder leaves freshwater in the autumn and can often be caught in estuaries when the first frosts occur. Then the fish move into deeper water for the winter. In the spring it migrates to the spawning grounds, travelling at three to four miles (five to seven kilometres) per day and not eating en route. Spawning takes place between February and May being later in more northerly latitudes. The female liberates about a million eggs which are lighter than water. The male liberates sperm which also floats and both eggs and sperm rise to the surface. Here the eggs are fertilised and hatch after six to eleven days depending on the water temperature. The developing larvae are planktonic and drift towards the coast with juvenile flounders living in shallow waters and estuaries. Young flounders become mature when still small, the males when they measure 11.5 centimetres (4.5 in) and the females when they measure 18 cm (7 in).[4] The European flounder sometimes hybridises with European plaice (Pleuronectes platessa) and, particularly in the western Baltic Sea, the hybrid is common.[5]

Human interactions

The European flounder is used for human consumption but is not so highly esteemed as the European plaice or common sole (Solea solea).[4] The most important fisheries are in the Baltic Sea and the waters around the Netherlands and Denmark. In 2010, the total world catch was about nineteen thousand tonnes, mostly caught by bottom trawling. The fish is marketed fresh and frozen and can be fried, boiled, steamed, baked or microwaved.[5]

It has been found that male European flounders living in polluted estuaries may show signs of excess exposure to oestrogens. Substances such as vitellogenins have been identified in their blood at between four and six times the concentration found in the blood of fish from uncontaminated areas, however the flounder is less sensitive to oestrogens than is the freshwater rainbow trout.[6]

Status

The European flounder is assessed by the IUCN in their Red List of Threatened Species as being of "Least Concern". This is because it has a large population size and extensive range, and is common in nearly all parts of its range. Numbers of fish may be decreasing somewhat but not to the extent that would warrant listing it under a higher risk category.[1]

References

  1. ^ a b c Munroe, T. A. (2009-02-04). "Platichthys flesus". IUCN Red List. International Union for Conservation of Nature. Retrieved 2013-08-31.
  2. ^ a b Bailly, Nicolas (2013). "Platichthys flesus (Linnaeus, 1758)". WoRMS. World Register of Marine Species. Retrieved 2013-08-31.
  3. ^ a b Luna, Susan M. "Platichthys flesus (Linnaeus, 1758)". FishBase. FishBase. Retrieved 2013-08-31.
  4. ^ a b c d Jenkins, J. Travis (1958). The Fishes of the British Isles. Frederick Warne & Co. pp. 187–190. ASIN B00ABHEN6Y.
  5. ^ a b Fisheries and Aquaculture Department. "Platichthys flesus (Linnaeus, 1758)". Species fact sheets. Food and Agriculture Organization of the United Nations. Retrieved 2013-09-01.
  6. ^ Allen, Yvonne; Scott, Alexander P.; Matthiessen, Peter; Haworth, Sarah; Thain, John E.; Feist, Steve (1999). "Survey of estrogenic activity in United Kingdom estuarine and coastal waters and its effects on gonadal development of the flounder Platichthys flesus". Journal of Environmental Toxicology and Chemistry. 18 (8): 1791–1800. doi:10.1002/etc.5620180827.{{cite journal}}: CS1 maint: multiple names: authors list (link)