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Coregonus maraena, Maraena whitefish : fisheries, aquaculture
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Coregonus maraena
Picture by
Freyhof, J.
Teleostei (teleosts) >
Salmoniformes
(Salmons) >
Salmonidae
(Salmonids) > Coregoninae
Etymology:
Coregonus:
Greek, kore = pupils of the eye + Greek, gonia = angle (Ref.
45335
)
.
More on author:
Bloch
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; freshwater; brackish; demersal; anadromous (Ref.
88171
); depth range 10 - 20 m (Ref.
130226
). Temperate; 69°N - 49°N, 7°E - 37°E (Ref.
59043
)
Europe: In the Baltic Sea: Swedish coast (including Bothnian Gulf, not in Gotland); in southern Baltic, extending from the Schlei to Gulf of Finland. Southeast North Sea Basin: Ems, Weser and Elbe drainages and small rivers of Schleswig-Holstein and Denmark. Landlocked in several lakes in Poland, Sweden, and Russia. Introduced and transplanted in many drainages within its native range and outside westward to Rhine drainage (Ref.
59043
). Apparent abundance in Germany, Poland and Scandinavia results from the massive stocking programs without which the populations would rapidly decline. Usually known as
C. lavaretus
in the Baltic Sea basin. North Sea population might represent a distinct species (Ref.
59043
).
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 130 cm TL male/unsexed; (Ref.
593
); max. published weight: 10.0 kg (Ref.
593
)
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
).
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
).
Kottelat, M.
, 1997. European freshwater fishes. An heuristic checklist of the freshwater fishes of Europe (exclusive of former USSR), with an introduction for non-systematists and comments on nomenclature and conservation. Biologia, Bratislava, 52/Suppl. 5:1-271. (Ref.
13696
)
IUCN Red List Status (Ref.
130435
)
Vulnerable (VU)
(A2cd); Date assessed:
05 March 2010
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
Fisheries: minor commercial; aquaculture: commercial
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Estimates based on models
Preferred temperature (Ref.
123201
): 4.5 - 9.7, mean 7.5 °C (based on 174 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00537 (0.00328 - 0.00878), b=3.20 (3.06 - 3.34), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.5 ±0.3 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (tm=2-3).
Fishing Vulnerability (Ref.
59153
): Very high vulnerability (78 of 100).
Price category (Ref.
80766
):
Very high
.
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- 20 July 2016
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