Actinopterygii (ray-finned fishes) > Pleuronectiformes
(Flatfishes) > Pleuronectidae
(Righteye flounders) > Pleuronectinae
Etymology: Liopsetta: Greek, leio = smooth + Greek,psetta = grouper (Ref. 45335).
Environment / Climate / Range
Marine; freshwater; brackish; demersal; depth range 0 - 90 m (Ref. 50550). Polar
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 35.0 cm TL male/unsexed; (Ref. 2058)
soft rays: 35 - 44;
Vertebrae: 37 - 38. Distinguished by the presence of both eyes on the same side of the head, normal scales and generally plain coloration (Ref. 27547). Lateral line with a very low curve above pectoral fin, straight behind and with a short accessory branch on head; 73-76 pores on main portion; it is complete in males but in females as large as about 20 cm it is an open groove on the posterior part of the body (Ref. 10319). Most anterior dorsal ray above eye; anal with an embedded forward-pointing spine before first ray; caudal rounded (Ref. 27547). Eyed side dark olive green to brown, sometimes with scattered black dots or indefinite dark blotches; blind side white, rarely with brown lappings over from the eyed side; fins pale brownish, sometimes with a somewhat yellow tinge or traces of dark spots (Ref. 27547).
Northeast Atlantic and Arctic: White Sea and Barents Sea eastward along the coasts of Siberia and North America to Queen Maud Gulf in Arctic Canada. North Pacific: Chukchi and Bering seas to Bristol Bay, Alaska and the northern Sea of Okhotsk.
A coastal species not found far offshore (Ref. 27547). Occurs at shallow depths on mud bottoms, often in brackish water (Ref. 4705) and frequently entering freshwaters (Ref. 59043). Benthic (Ref. 58426). Feeds on small fishes and bottom invertebrates (Ref. 4705). Moves closer inshore in the evenings, especially on a rising tide (Ref. 27547). Appears to move offshore in the fall and inshore in the spring (Ref. 27547).
Reproduction cycle believed to occur only every second year (Ref. 27547).
Cooper, J.A. and F. Chapleau, 1998. Monophyly and intrarelationships of the family Pleuronectidae (Pleuronectiformes), with a revised classification. Fish. Bull. 96(4):686-726. (Ref. 30193)
IUCN Red List Status (Ref. 96402)
CITES (Ref. 94142)
Threat to humans
Fisheries: minor commercial
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00248 - 0.00611), b=2.96 (2.83 - 3.09), based on LWR estimates for species & (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.4 ±0.1 se; Based on diet studies.
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (K=0.06; tm=2; Fec=31,000-230,000).
Vulnerability (Ref. 59153
): High vulnerability (65 of 100) .