Petersen型資源量推定法の-吟味

概要

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Assuming that the diminution of tags which involves the extra natural mortality of the tagged fish and the loss of tags, occurs at a constant rate throughout the period of experimentation, the extent of overestimation in the PETERSEN-type estimate, caused by the above factors was analysed. The calculation showed that the bias of estimate increases as time passes and tends to approach the maximum limit which is determined by the ratio of the tag diminution coefficient to the total mortality coefficient (Eqns. 4, Table 1 and Fig. 1). In order to eliminate this bias, a method based on the series of sample tag ratios obtained for regular intervals after liberation, was deduced (Eqns. 7 and 14). The validity of this method was ascertained by the bead drawing experiment and comparing the results obtained by this method with those of simple PETERSEN method and the BEVERTON method, the advantages and disadvantages were discussed. It was also shown that the size of natural mortality coefficient may roughly be estimated by using the Author's method and the BEVERTON method together (Table 4).
社団法人日本水産学会の論文