釣獲曲線について (カツオ一本釣機構に関する研究-1,2-)
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概要
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In the previous paper, the authors reported several information in regard to the mechanism of the angling for mackerel-shoals. It is the purpose of this paper to see whether or not these informations obtained by the experimental study of the angling for mackerel-shoals will be applicable to the angling of skipjack in the ocean. The shoals of skipjack in the sea are often found associated with a whale shark, sei whales or a large driftwood and sometimes with a shoal of other small fish. Many shoals are, however, seen with no association to other animal or object. The shoals of skipjack found in our surveys were shoals with birds, shoals with whales, shoals with a whale shark and shoals with no association to other animals. The largest catch was obtained from the shoal with a whale shark. From this shoal, 2164 fish were caught within 44 minutes (Table 1). The correlations of total number of fish angled from a shoal with the angling period and with maximum number of fish caught/one minute/a fisherman could not be found (Figs. 2 and 4). The angling curves determined on 33 anglings for skipjack were classified into 3 types (Table 2 and Fig. 3). The 1 st type of the angling curve had a peak and a bottom and in the previous paper, we called this type of the angling curve the decreasing type. The 2 nd type had a flat peak and a bottom and we called it the ceiling type. The 3 rd type had two or more peaks and bottoms and it was considered that the type was composed of two or more angling curves belonging to the 1 st type. The last type coinsided with the type of the angling curve obtained in the experimental angling for the shoal of mackerel which had a poor appetite. Therefore, it was ascertained that the angling curves obtained by experimental anglings for mackerel-shoals were similar to the angling curves obtained by the anglings for skipjack in the ocean.
- 社団法人 日本水産学会の論文
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