. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 636 BIOLOGY OF THE SEAS OF THE vary greatly for different fish—from 26 for starred sturgeon to 368 for B. stellatus. Mollusc-eating fish have the highest index of repletion (from 107 to 368); it varies from 75 to 211 for worm eaters. When fish is the basic diet the repletion indices fall to 26 to 120 and, finally, with a diet of crustaceans the indices range from 27 to 79. In general indices of repletion are inversely pro- portional to the calorific value of food, as illustrated by the fol
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 636 BIOLOGY OF THE SEAS OF THE vary greatly for different fish—from 26 for starred sturgeon to 368 for B. stellatus. Mollusc-eating fish have the highest index of repletion (from 107 to 368); it varies from 75 to 211 for worm eaters. When fish is the basic diet the repletion indices fall to 26 to 120 and, finally, with a diet of crustaceans the indices range from 27 to 79. In general indices of repletion are inversely pro- portional to the calorific value of food, as illustrated by the following data: Gammaridae Corophiidae Chironomidae Sprat 3-92 cal/g Vobla 1-00 cal/g 2-34 cal/g Bullheads 0-76 cal/g 2-34 cal/g Benthophilus 0-63 cal/g 1-47 cal/g Dreissena polymorpha 0-63 cal/g This regularity is somewhat broken only by worm-eating fish, since for food of high calorific value the indices of repletion are Fig. 298. Vertical distribution of fish feeding grounds in the Caspian Sea (Schorygin, 1952). 1 Knipowitschia longicaudata; 2 Bubyr caucasicus; 3 Sturgeon; 4 Benthophilus marmoratus; 5 Golden shiner; 6 Hyrcanogobius bergi; 7 Carp; 8 Gobiusflimatilispal- lasi; 9 Gobius melanostomus affinis; 10 Vobla; 11 Benthophilus stellatus; 12 Sturgeon; 13 Casp. Alosa; 14 Starred sturgeon; 15 Pike perch; 16 Casp. braschnikovi; 17 Casp. sphaerocephala {agrakhanskaya). A fish's choice of food is to a considerable degree correlated with its man- ner of life: fish living in a definite horizon use mainly organisms adapted to this horizon. If food organisms are divided into pelagic and benthonectic, epifauna and infauna, we get a basic adaptation of each fish to a certain horizon (Fig. 298). Typical predators, pike perch, and the dolginskaya and agrakhanskaya herrings feed mainly on pelagic organisms. Morover, pike perch feed mostly on bottom-living fish (bullheads and vobla), and herring on pelagic fish (sprats). Starred sturgeon and Caspialosa saposhnikovi eat benthos (bo
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