. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 780 BIOLOGY OF THE SEAS OF THE Characteristically, mackerel feeds intensively during the period of its spawning migration. After spawning, mackerel concentrates in the northern part of the Sea in large numbers for feeding. It feeds mostly on large copepods {Calanus tonsus, C. finmarchicus) and euphausiids (Thysanoessa raschii and 77?. sp.) and, as a predator, consumes also fish fry. The study of the feeding habits of flatfish (Pleuronectidae family) of the Far Eastern Seas (N. Gordeev, 195
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 780 BIOLOGY OF THE SEAS OF THE Characteristically, mackerel feeds intensively during the period of its spawning migration. After spawning, mackerel concentrates in the northern part of the Sea in large numbers for feeding. It feeds mostly on large copepods {Calanus tonsus, C. finmarchicus) and euphausiids (Thysanoessa raschii and 77?. sp.) and, as a predator, consumes also fish fry. The study of the feeding habits of flatfish (Pleuronectidae family) of the Far Eastern Seas (N. Gordeev, 1954; L. Mikulich, 1954) has shown that halibut {Hippoglossus hippoglossus stenolepis, Reinhardtius hippoglossoides matsurae, Atherestes evermanni) lives mostly on fish. Seventy-two per cent of the diet of the first-named consists of fish (pollack, sand-eel and others). The. Fig. 385. Food correlation of plaice in the area of the southeastern coast of Sakhalin (Mikulich, 1954). Thick lines—strong food correlations; thin lines— average, broken lines—weak food correlations. 1 Limanda aspera; 2 Platessa quadrituberculata; 3 Pleuronectes stellatus; 4 Limanda punctatissima probos- cidea; 5 L. p. punctatissima; 6 Glyptocephalus stelleri; 7 Pseudopleuronectes yokohamae; 8 Acanthopsetta nadeshnyi; 9 Hippoglossoides elassodon dubius; 10 Atheresthes evermanni; 11 Hippoglossus hippoglossus stenolepis. second place in its diet is occupied by large crustaceans (crabs, hermit crabs, amphipods, prawns) and large molluscs (Seripes groenlandicus and cephalo- pods). The majority of the Pacific Ocean flatfish, in contrast to halibut, are bentho- pages (worms, polychaetes, molluscs, sometimes bottom-living crustaceans and echinoderms). The diet of some flatfish is mixed, both fish and pelagic crustaceans forming at times a considerable part of it (Figs. 385 and 386). Stomach repletion indices of halibut and flatfish are 150 to 200, rising some- times to 300 or even 600. The nature of the food o
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