漕刺網漁業におけるアカアマダイの資源管理について〔英文〕

概要

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This paper presents a method for managing the branquillos population taken by the sweeping trammel net fishery in Wakasa Bay. The study was made on the basis of informations obtained up to the present time from the view point that the fishery seemed to be controlled chiefly by the population size rather than by the regulations of fishing period and number of boats. An analysis was made with the data on the commercial fishery of branquillos taken by long line in western Wakasa Bay to examine the migration of the species. The analysis showed that branquillos might make little migration, at least for a relatively short period. Under the assumption that the species migrates vary little and recruits into the exploited phase from the egg stage in the fishing area, a mathematical model was con-sidered in order to establish a method whereby the fish population management was pos-sible, namely in satisfying two conditions, sustaining an adequate recruit and exploiting year classes efficiently. The application of the above method to the data of 1970 showed that the sweeping trammel net fishery is greatly dependent on the rather small sized branquillos in Wakasa Bay. It was also recognized that it is also necessary to manage the branquillos population corresponding to its yearly condition, as there appeared a considerable variation in the size of year classes.
日本水産學會の論文