コホ-ト解析による筑前海マダイの資源量の推定

概要

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In the Chikuzenkai catch statistics by age and fishery were prepared on red sea bream and stock size was estimated using the cohort analysis in order to get fundamental information on the management.The ages in the catches ranged from 0 to 6 years old with composition extremely skewed to the younger ages less than 3 which were exploited mainly by one-boat gochi net (surrounding seine) and two-boat gochi net. The older fish were exploited by angling, longline and bottom gillnet.The number of fish recruited at July of age 0 (three months old) were estimated to be 22-34 millions from 1978 to 1982. The mean survival rates were 24% to age 1, 7% to age 2, 2% to age 3. Reduction of the high fishing pressure to the younger fish was suggested to increase the catches of the older and larger fish.
日本水産學會の論文