The continuance of fishing ground availability by tuna purse seine fisheries in the Western Pacific Ocean

Nemoto, M.; Kim, H.S.; Mohri, M.; Takeuchi, S.

Journal of the Tokyo University of Fisheries 85(2): 109-120

1998


ISSN/ISBN: 0040-9014
Accession: 011485127

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Abstract
With the records of QRY communications among the tuna purse seiners from Nov. 1991 to Jan. 1992, the continuance of fishing ground availability was discussed from the beginning until the end of fishing operations at the same operation site targeting the pelagic migrating schools. For this purpose, the success ratios were examined as the proportions of successful operations with the catch amount over 5 tons. The success ratio was low as 36-52% for the pelagic migrating schools, while higher as 75-85% for the schools associated with the drifted logs. During the January fishing season, main targets were the pelagic migrating schools in the two central areas of west and east fishing grounds. Of the North Equatorial Current where the schools associated with the drifted logs were not identified. In the both fishing grounds, the catch of yellowfin tuna was 1.5 times of that of skipjack tuna. The success ratio in the east fishing ground was 24.5%, which was less than a half of the ratio 52.7% of west fishing ground. The continuance of fishing ground availability tends to be longer for the operations targeting the pelagic migrating schools in the fishing grounds where the schools associated with the drifted logs could be also targeted at the same time. In January, for the operations only targeting the pelagic migrating schools, the continuance of fishing ground availability tends to be shorter as 4-7 days due to the less chances to target the schools associated with the drifted logs.