東シナ海・黄海産マダイ資源の研究-VI : 1965年の標識放流調査から推定した黄海産マダイの資源量

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Estimation of the stock of sea bream, Chrysophrys major TEMMINCK et SCHIEGEL in the Yellow Sea was made with a modification of PETERSENs methcd, using data of tagging (791 were recovered out of 4, 850 individuals) made in October 1965, and the catch and effort statistics from September 1965 to August 1966. The estimated population size of the sea bream in late October was 17.97 million individuals, with 95% confidence limits of 14.55 and 18.87 millions. The calculated exploitation rate for a year from October 1965 to August 1966 is 0.21. Since the greater part of the catch occurred from October to March, this figure relates chiefly to this season. Vulnerability of tagged fish coincided well that of other sea bream (small and baby) caught during the period of recovery or during the highest fishing season (Table 4, Fig. 2). The results thus indicates the accuracy of the above estimation. The validity of this estimation was ascertained by comparing the results obtained with tagging investigation of 1964 and 1965 (Table 5). Rates of decrease for the year were almost identical both in estimated number of individuals of sea bream and in the size of population index. The results also seem to suggest the adequacy of the present estimation.
公益社団法人日本水産学会の論文