. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 YEAR Figure 61-16. Catch histories of eastern Bering Sea Tanner crab fisheries by various nations. declining king crab quotas. With a greater emphasis on Tanner crab, the CPUE in the Japanese tangle-net fishery increased from Tanner crab per tan lift in 1966 to crab per tan hft in 1967. Increases in Soviet CPUE were also rapid. By 1969, CPUE in both tangle-net fisheries had peaked ( for Japan, for the ), and redirecti
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 YEAR Figure 61-16. Catch histories of eastern Bering Sea Tanner crab fisheries by various nations. declining king crab quotas. With a greater emphasis on Tanner crab, the CPUE in the Japanese tangle-net fishery increased from Tanner crab per tan lift in 1966 to crab per tan hft in 1967. Increases in Soviet CPUE were also rapid. By 1969, CPUE in both tangle-net fisheries had peaked ( for Japan, for the ), and redirection could be considered complete. Some reported effort was, however, still directed at king crab. Japan relied on expanding pot fisheries rather than simply redirecting efforts with tangle nets. For example, the percentage of the Japanese eastern Bering Sea Tanner crab catch taken by tangle nets declined from almost 97 percent in 1967 to 42 percent in 1969 and 5 percent in 1971. In order to adjust for differences in the efficiencies of different gear, the fishing power of each kind of gear was computed relative to pot lifts according to the method of Robson (1966). This procedure makes it possible to compute the total effort of all nations in eastern Bering Tanner crab fisheries. Plotting of total effort against the estimated total catch in weight (Fig. 61-17) shows that catch and effort follow divergent trends until about 1969. From 1970 on, trends in catch and effort became progres- sively more similar as foreign king crab fisheries were phased out and as effort increased. b TANNER CRAB 100 - 90 - ^-- \ Effort 1 - 80 ' \ \ \ ^ -A / ^^ \ -^ \ 1 (0 O 70 - \ \ f f ' Tâ \ 1 1 X \ / / â ""^ 60 - \ - (A Q \ \ \ / / / / z 50 - .. V / / - 3 / Nv ^^-^ / / o Q. 40 - Catch / \^^ \ \ \ / / - 30 ~ ^X ^^^ ^^^S / / ' 20 - / - 10 - - 2700 T) O 2400 H r 2100 â n H m 1800 O c r m 1200 z (0 ^^^ 900 X â¢A o 600 <0» - 300 65 66 67 68 69 70 71 72 73 74 75 76 77 78 YEA
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