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.
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.
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