Flathead flounder

The flathead flounder (Hippoglossoides dubious) is a flatfish of the family Pleuronectidae. It is a demersal fish that lives on bottoms in shallow coastal waters, at depths of between 10 and 600 m. Its native habitat is the northwestern Pacific, particularly the seas of Japan and Okhotsk, and the coastlines of Kamchatka and Korea. It grows up to 45 cm in length.

Reproduction
The flathead flounder spawning season is from February to April, and spawning takes place at depths of 180 and 200 m. Females undergo one reproductive cycle per year and produce between 90,000 and 950,000 eggs during each cycle.