Yellow-fin flatfish
Limanda aspera
Yellow-fin flatfish     Flatfish lead a bottom-dwelling lifestyle. They would lie on the floor and, as a rule, swim on their right side. The larvae are almost the same as normally symmetric fish, but when the body length is 1-2 cm they undergo metamorphosis that leads to body form characteristic of flatfish: both eyes would be on the right side, the skull would deform, and the small mouth would become asymmetric. The body side turned to the sea floor would become light, and the upper side would acquire the ability to change color depending on the nature of the substrate. The flatfish is usually about 30 cm long, and some specimens grow to as long as 0.5 m to weigh 0.5 kg.
    This species is probably the most numerous and widespread. At depths of 100-250 m, it forms large accumulations, especially in winter, to become torpid and to almost stop eating. In summer, fish schools move in search of food on shallows, which abound in bivalve mollusks, worms, small crustaceans and flat sea urchins. Occasionally large accumulations of flatfish on silted floor are almost imperceptible to the underwater observer: only light turbid clouds raised by abrupt fin flaps of disturbed fish would give them away.
    Spawns in spring at 15-80 m deep. Lays roe in small portions. One female spawns about 1.2 million roes, which would rise into the water mass to develop. The yellow-fin flatfish is a major commercial species in the Russian Far East.