. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE BARENTS SEA 163. Fig. 64. Chart of eastward migration of cod (Maslov). 1 Wintering areas of immature cod; 2 Migration of mature cod; 3 Migration of immature cod. The seasonal change of cod diet (according to V. Zatzepin and N. Petrova) as a percentage of the index* of repletion is also given in Table 71. Cod eats most intensively at depths of 50 to 100 m; lower down its food consumption declines sharply. Since the eastern part of the Sea is its main Table 71. Autumn feeding of cod in eastern pa
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE BARENTS SEA 163. Fig. 64. Chart of eastward migration of cod (Maslov). 1 Wintering areas of immature cod; 2 Migration of mature cod; 3 Migration of immature cod. The seasonal change of cod diet (according to V. Zatzepin and N. Petrova) as a percentage of the index* of repletion is also given in Table 71. Cod eats most intensively at depths of 50 to 100 m; lower down its food consumption declines sharply. Since the eastern part of the Sea is its main Table 71. Autumn feeding of cod in eastern part {winter lull) Food groups Periods Fish Pelagic Other Benthos Other Index of Empty crustaceans planktons crustaceans benthic animals repletion stomachs, per cent Spring fishing in central fishery areas 84 10 3 1 2 175 25 Period of forced starvation 71 19 2 3 5 25 41 Summer feeding in central fish- ery areas 30 61 1 3 5 30 26 When migrating to the east 52 6 2 23 17 162 23 When migrating to the west 78 7 12 1 2 171 24 Immature cod 61 13 19 1 6 50 44 Mature cod 37 15 — 22 26 7 80 * The index of repletion is the ratio of the contents of the intestines to the weight of fish, expressed as 1/100 of the percentage (prodecimille). There is a difference between the general index of repletion (for the whole contents of the intestines) and the particular in- dices (for the separate component groups).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zenkevich, L. A. (Lev Aleksandrovich), 1889-1970. New York, Interscience Publishers
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