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리 현상의 원인에 대한 이론적인 고찰
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리“현상의 원인에 대한 이론적인 고찰
Three possibilities of the causes of Lee's phenomenon on the scale of walleye pollock based on the 1,045 specimens from the Bering Sea and the Sea of Japan were examined by the indices of intensity of Lee's phenomenon(I=1.349 d/s). The factors of artificial handling error, selective fishing mortality, and biassed sampling were taken into consideration for the examination. It has been found out that larger fish which had better growth were apt to be caught for the fishing gear like gill-net and that they reached earlier to the fishing ground at the main fishing season. The main cause of Lee's phenomenon in this study was proved to be selective fishing mortality. In addition, artificial handling error and biassed sampling appeared to be partly concerned in Lee's phenomenon.
序論
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2011.04.08
20페이지
