潮境に於ける水産資源の定量生態学的研究-III : サンマの分布と回游について
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In the present paper, physical and biological properties of the environment relating to the ecology of the saucy have been examined in connection with the characteristics of the boundary zone chiefly between Oyashio and Kuroshio. The physical environment at the beginning of the fishing season was analysed by using the data from the observations made in the Tohoku sea-area off Hokkaido by Tohoku Regional Fish-eries Research Laboratory in September, 1951 (Fig. 1, 2). The environmental data on the fish-ing season were obtained from the oceanographic observations made by Hakodate Marine Meteoro-logical Laboratory in October, 1951. The plankton population war estimated from the oxygen supersaturation by the method described in the preceding paper. The distribution of the plankton population, water temperature and the catches of sauries is shown in Fig. 3. The appearance of sauries coincides with high plankton populations in the region. This fact shows that the quantitative distribution of plankton populations-a scalar field of the plankton is one of the most important environmental factors for the ecology of the aury. Fig. 4 shows the seasonal trends of the distribution of plankton populations and sauries in the sea surrounding Japan, where the former is estimated by using the correlation between the oxygen supersaturation and the water temperature (see preceding paper) and the latter is based on the data of H. KASAHARA and N. OTSURU (1952). The seasonal trartsition of highly productive zone with high plankton populations which is mainly formed in the boundary zone is fairly in accord with the seasonal migration of the saury. As the result, such productive zone is considered as the habitat of saurie and their seasonal mig-ration is explained by the transition of the field of plankton population wnich is a biologic environment. At last, a discussion is made on the area of the productive zones and their seasonal trends (Table 1, 2).
- 公益社団法人 日本水産学会の論文
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