
doi: 10.1139/f75-142
Using data on number of cetaceans caught per 1000 "tans" (= approximately 50 m) of salmon drift gillnet, incidental catch rates by salmon research vessels of the Japanese Fisheries Agency averaged 0.476. The maximum was 1.42. The average ranged between 0.37 and 0.65 from 1962 to 1971, indicating negligible effect on porpoise populations. These figures are much lower than the average incidental catch rate (6.66) in the United States salmon drift net research. The main catch is Phocoenoides dalli.
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