. The Canadian field-naturalist. The Canadian Field-Naturalist Vol. 95 Table 1 —Occurrence and relative abundance of Arctic Cod in the study areas Tows with No. of Number Arctic Arctic Cod of Cod per tow. Area tows (%) mean (range) Northern Bering Sea' 32 (0-37) Northeastern Chukchi Sea- 10 (1-26) Western Beaufort Sea- 8 (2-24) Central Beaufort Sea- 15 (0-11) 'Bottom time 20 min. -Bottom time 10 min. the receding ice edge, and suggests that they do not penetrate far to the east in the Beaufort Sea. There was no obvious relationship between depth of water and
. The Canadian field-naturalist. The Canadian Field-Naturalist Vol. 95 Table 1 —Occurrence and relative abundance of Arctic Cod in the study areas Tows with No. of Number Arctic Arctic Cod of Cod per tow. Area tows (%) mean (range) Northern Bering Sea' 32 (0-37) Northeastern Chukchi Sea- 10 (1-26) Western Beaufort Sea- 8 (2-24) Central Beaufort Sea- 15 (0-11) 'Bottom time 20 min. -Bottom time 10 min. the receding ice edge, and suggests that they do not penetrate far to the east in the Beaufort Sea. There was no obvious relationship between depth of water and catches of Arctic Cod. In the northeastern Chukchi and Beaufort seas, 26 tows were made in water 40-100 mdeep whiles tows were in waters 101-400 m deep. The mean number of Arctic Cod caught was in shallow tows (range 0-26) and in deeper tows (range 0-24). In the Bering Sea most tows were in waters less than 50 m deep and again there was no obvious relationship between abundance and water depth. We casually examined the gonads of the larger Arc- tic Cod caught; in both sexes these were small, ranging in weight from to g, usually less than 3% of the total body weight of the fish. That is consistent with previous observations that gonadal development be- gins in September in preparation for spawning during winter months (Moskalenko 1964). Fishes caught in the northeastern Chukchi and Beaufort seas were generally smaller than those caught in the northern Bering Sea (Figure 2). In the former area mean fork length was cm (range ) while in the latter area mean length was cm (range ). This difference is attributa- ble to several factors. First, the fishes caught in the Bering Sea were generally older than those from the more northern area. In the northeastern Chukchi and Beaufort seas 1-yr-old Arctic Cod made up 81% of the catch, but in the Bering Sea they comprised only 27% of the catch. Arctic Cod older than 4 yr were caught only in the Beri
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