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Life Cycle

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Adults ascend rivers between June and October (northern Baltic) or November (southern Baltic), when water temperature drops below 10 °C. Spawning occurs in estuarine areas with low salinities or lower reaches of rivers or rapids (Ref. 59043). Coregonus species spawn on gravel and sand bottoms (Ref. 35387). Spawns for the first time at 3-5 years. Some females spawn only every second year (Ref. 59043). Spawners may spend the winter in rivers or near estuaries along the coast (Ref. 89484). Eggs hatch in early spring and larvae drift downstream to estuarine bays or to the sea; juveniles migrate to the sea in summer (Ref. 59043).
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Migration

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Anadromous. Fish that ascend rivers to spawn, as salmon and hilsa do. Sub-division of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.
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Biology

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Forages along coasts. Also reported from deep, oligo-mesotrophic lakes. Feeds on benthic prey (crustaceans, molluscs, large insect larvae, small fish). Spawns in shallow water, in rapids or small rivers or over firm sediments in lowland rivers and estuaries. Northernmost stocks undertake the longest migrations between spawning and foraging grounds. In the northern part of the range, individuals may travel as much as 700 km between these areas (Ref. 59043).Growth parameters from Russia suggest a maximum age of 20 years (Ref. 56506) .Members of the genus Coregonus readily hybridise with other Coregonus species and populations (Ref. 89548).
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Importance

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fisheries: minor commercial; aquaculture: commercial; price category: very high; price reliability: very questionable: based on ex-vessel price for species in this family
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Coregonus maraena

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Coregonus maraena, referred to in English as the maraene,[1] maraena whitefish[2] or the whitefish,[3] is a whitefish of the family Salmonidae that occurs in the Baltic Sea basin - in the sea itself and the inflowing rivers, and in several lakes as landlocked populations. It is found in Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Netherlands, Norway, Poland, Slovakia (Štrbské pleso), Russia and Sweden.[1] As of 2013, it has been listed as a vulnerable species by the IUCN[1] and as endangered by HELCOM.[3] It is an extremely important fish within the Baltic Sea ecosystem, both for population equilibrium and for the local diets of the surrounding human population. Due to a variety of factors, mostly overfishing, the maraena’s population dwindled to near-extinction levels. Thus, rampant repopulation was enacted to preserve this important fish. [4]

In the Baltic basin countries, this species has traditionally been known as Coregonus lavaretus (the common whitefish). The name Coregonus maraena has been adopted following the suggestion that the name Coregonus lavaretus should only be applied narrowly to some whitefish populations in France and Switzerland, as advocated by Kottelat and Freyhof,[5] and repeated by the IUCN and FishBase.[1][2]

References

  1. ^ a b c d e Freyhof, J. (2011). "Coregonus maraena". IUCN Red List of Threatened Species. 2011: e.T135672A4176316. doi:10.2305/IUCN.UK.2008.RLTS.T135672A4176316.en. Retrieved 13 November 2021.|date= / |doi= mismatch
  2. ^ a b Froese, Rainer; Pauly, Daniel (eds.) (2010). "Coregonus maraena" in FishBase. June 2010 version.
  3. ^ a b HELCOM (2013). "HELCOM Red List of Baltic Sea species in danger of becoming extinct" (PDF). Baltic Sea Environmental Proceedings (140): 72. Archived from the original (PDF) on 2014-10-07. Retrieved 2014-07-30.
  4. ^ Bochert, R, Luft, P. Combined effect of temperature and live feed period on growth and survival of Coregonus maraena (Bloch, 1779) larvae. Aquac Res. 2019; 50: 2972– 2977. https://doi.org/10.1111/are.14252
  5. ^ Kottelat, M. and Freyhof, J. 2007. Handbook of European Freshwater Fishes. Publications Kottelat, Cornol, Switzerland.

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Coregonus maraena: Brief Summary

provided by wikipedia EN

Coregonus maraena, referred to in English as the maraene, maraena whitefish or the whitefish, is a whitefish of the family Salmonidae that occurs in the Baltic Sea basin - in the sea itself and the inflowing rivers, and in several lakes as landlocked populations. It is found in Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Netherlands, Norway, Poland, Slovakia (Štrbské pleso), Russia and Sweden. As of 2013, it has been listed as a vulnerable species by the IUCN and as endangered by HELCOM. It is an extremely important fish within the Baltic Sea ecosystem, both for population equilibrium and for the local diets of the surrounding human population. Due to a variety of factors, mostly overfishing, the maraena’s population dwindled to near-extinction levels. Thus, rampant repopulation was enacted to preserve this important fish.

In the Baltic basin countries, this species has traditionally been known as Coregonus lavaretus (the common whitefish). The name Coregonus maraena has been adopted following the suggestion that the name Coregonus lavaretus should only be applied narrowly to some whitefish populations in France and Switzerland, as advocated by Kottelat and Freyhof, and repeated by the IUCN and FishBase.

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