중서부태평양 수역 우리나라 다랑어 선망 어업의 시계열에 의한 어획 효율 분석

Abstract

Korean tuna purse seine fishery in the Western and Central pacific ocean accounts for the largest portion in the Korean distant water fisheries. The need to increase the fishing efficiency of the purse seine fishery is growing due to not only the continuous increase in fishing costs including fishing fee(license fee) but also the strengthening of regulatory measures by the Regional Fisheries Management Organizations. Based on the catch report data, the catch efficiency of tuna purse seine fishery was analyzed in a time series based on the specific criteria for a time of day and the moon phase by each school type. As a result for a time of day, fishing efficiency were good during the sunrise and sunset for skipjack and around 4 PM for yellowfin tuna. In consequence for a moon phase, it showed better fishing efficiency during the new moon for skipjack tuna and the full moon for yellowfin tuna in the free school sets. As for the FAD sets, it was better during the full moon in the most of case. Especially, there was a large deviation in the fishing efficiency by moon shape between 4 PM and 7 PM, which is affected by the lunar illuminance (or moonlight). The results of this paper are intended to be used as a preliminary research to improve the fishing efficiency of the Korean tuna purse seine fishery in the Western and Central Pacific ocean.