Blackfin flounder is a slender flatfish of the northern Pacific. Its dark fin edges and small mouth help set it apart from other flounders.

Appearance

Appearance
The body is long and flat, with a small mouth and dark edging on the long fins above and below the body.

Look-alikes

Rex soleGlyptocephalus zachirus

Rex sole (Glyptocephalus zachirus) has a notably long, mostly black just behind the head. Blackfin flounder is known for dark edging along the long fins above and below the body.

Why they get mixed upBoth are slender Pacific flatfish with small mouths.

Where it lives

Typical habitats
  • Deep sandy and muddy seafloor
Range
Its main range is around Japan, Korea, and the Russian Far East; it is also found offshore of Alaska. It is a bottom-dwelling fish rather than a familiar shore fish in the U.S.

Conservation

IUCN Red List
DDData DeficientNot enough data yet to assess
9 sources
  1. iNaturalist taxon API: Glyptocephalus stelleri
  2. 국립해양생물자원관 기름가자미
  3. 北海道 ヒレグロ
  4. 鳥取県 ヒレグロ
  5. 국립해양생물자원관 갈가자미
  6. 北海道大学 ヒレグロ Blackfin flounder
  7. NOAA Fisheries Rex Sole
  8. FishBase Glyptocephalus stelleri
  9. NOAA Ichthyoplankton Information System taxonomic dictionary
Glyptocephalus stelleri — identification & habitat | Moeyo