Isopsetta isolepis  (Lockington, 1880)

Butter sole
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Isopsetta isolepis   AquaMaps   Data sources: GBIF OBIS
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Image of Isopsetta isolepis (Butter sole)
Isopsetta isolepis
Picture by Archipelago Marine Research Ltd.

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Pleuronectiformes (Flatfishes) > Pleuronectidae (Righteye flounders) > Pleuronectinae
Etymology: Isopsetta: Greek, isos = equal + Greek, psetta, grouper.

Environment / Climate / Range Ecology

Marine; demersal; oceanodromous (Ref. 51243); depth range 20 - 425 m (Ref. 6793).   Temperate, preferred ?; 66°N - 32°N

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Eastern Pacific: Bristol Bay in the southeastern Bering Sea and Amchitka Island (Aleutian Islands) to Ventura, California, USA.

Length at first maturity / Size / Weight / Age

Maturity: Lm 21.0  range ? - ? cm
Max length : 55.0 cm TL male/unsexed; (Ref. 2850); max. reported age: 11 years (Ref. 6885)

Short description Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 78-92; Anal spines: 0; Anal soft rays: 58 - 69; Vertebrae: 39 - 42. Dorsal origin above eye. Caudal rounded. Pectoral small, bluntly pointed.

Biology     Glossary (e.g. epibenthic)

Common in shallow water on soft, silty bottom. Moves into shallow water in summer and to deeper water in winter (Ref. 6885). Spawning adults exhibit north-south migrations (Ref. 6885). Feeds on chaetopod marine worms, young herring, shrimps, and sand dollars (Ref. 6885). A tasty food fish, sometimes marketed (Ref. 2850). Also used for mink food (Ref. 2850).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Amaoka, Kunio | Collaborators

Eschmeyer, W.N., E.S. Herald and H. Hammann, 1983. A field guide to Pacific coast fishes of North America. Houghton Mifflin Company, Boston, U.S.A. 336 p. (Ref. 2850)

IUCN Red List Status (Ref. 109396)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

Fisheries: minor commercial; gamefish: yes
FAO(Publication : search) | FisheriesWiki | Sea Around Us

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Internet sources

BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | Faunafri | Fishtrace | GenBank(genome, nucleotide) | GOBASE | Google Books | Google Scholar | Google | IGFA World Record | Otolith Atlas of Taiwan Fishes | PubMed | Scirus | SeaLifeBase | Tree of Life | Wikipedia(Go, Search) | World Records Freshwater Fishing | Zoological Record

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 1.0000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00891 (0.00439 - 0.01810), b=3.09 (2.92 - 3.26), based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.6   ±0.54 se; Based on food items.
Resilience (Ref. 69278):  Medium, minimum population doubling time 1.4 - 4.4 years (K=0.26; tmax=11; tm=2).
Prior r = 0.8, 2 SD range = 0.68 - 0.94, log(r) = -0.22, SD log(r) = 0.08, Based on: 1 K, 1 tgen, 1 tmax, records
Vulnerability (Ref. 59153):  Low to moderate vulnerability (35 of 100) .
Price category (Ref. 80766):   Medium.