年令別漁獲量に基づく九十九里浜,鹿島灘方面におけるカタクチイワシ漁獲量の予測

概要

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Off Chiba and Ibaraki Prefectures, major fishing grounds for the Japanese anchovy, Engraulis japonica (HOUTTUYN), are located in the waters along Kujûkuri Hama and Kashima Nada. In the area, the fishing activities are concentrated in two seasons of the year, January to July for II-age fish and October to December for 0-age fish. For a period from 1949 to 1960, the prefectural catch from a year class in one of the two seasons is highly correlated with the other, and with the catch of shirasu in Shizuoka, Aichi and Mie Prefectures. On the basis of these correlations, formulae are given for predicting the catches of 0-and II-age fish in several months or two years prior to the fishing seasons. Application of the formulae to the past data showed that the predicted amount agreed with the actual catch for eight or nine years out of ten. In order to advance the techniques of prediction, studies should be conducted on the following three subjects: 1) compositions of the commercial catch in regard of spawning ground and season, 2) preference of fishermen on a species to another, and 3) environmental effects on distribution of the fish.
公益社団法人日本水産学会の論文