Actinopterygii (ray-finned fishes) > Pleuronectiformes
(Flatfishes) > Pleuronectidae
(Righteye flounders) > Pleuronectinae
Etymology: Microstomus: Greek, mikros = small + Greek, stoma = mouth (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Marine; demersal; oceanodromous (Ref. 51243); depth range 10 - 200 m, usually 10 - 150 m (Ref. 35388). Temperate; 72°N - 43°N, 26°W - 45°E (Ref. 54592)
Northeast Atlantic: Bay of Biscay to the White Sea and off Iceland.
Length at first maturity / Size / Weight / Age
Maturity: Lm 31.5, range 20 - 30 cm
Max length : 65.0 cm TL male/unsexed; (Ref. 9988); max. published weight: 3.0 kg (Ref. 6112); max. reported age: 23 years (Ref. 6112)
Small head and mouth. Body is oval. Skin is marbled and smooth. Lateral line almost straight, slight curve above the pectoral fin (Ref. 35388).
Lives most often on stony bottoms. Feeds on a variety of small invertebrates, but polychaetes seem to dominate. Apparently they do not feed in wintertime (Ref. 9900). Marketed fresh and frozen; eaten steamed, fried, broiled, microwaved and baked (Ref. 9988).
Spawning is mainly confined to depths of 55-91 m in the northwestern North Sea and commences at a minimum temperature of 6.5 °C in Scottish waters. Sex ratio is about 1:1, but females progressively predominate upon sexual maturity.
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. 115185)
CITES (Ref. 115941)
Threat to humans
Fisheries: commercial; aquarium: public aquariums
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Preferred temperature (Ref. 115969
): 7.1 - 12.5, mean 9.9 (based on 1310 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00776 (0.00680 - 0.00886), b=3.07 (3.03 - 3.11), in cm Total Length, based on LWR estimates for this species (Ref. 93245
Trophic Level (Ref. 69278
): 3.2 ±0.33 se; Based on food items.
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (K=0.08-0.42; tm=3-6; tmax=23).
Prior r = 0.42, 2 SD range = 0.2 - 0.86, log(r) = -0.87, SD log(r) = 0.36, Based on: 7 K, 4 tgen, 1 tmax, 4 Fec records
Vulnerability (Ref. 59153
): Low to moderate vulnerability (34 of 100) .