大西洋メバチ漁獲量デ-タベ-スの作成とその応用

概要

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The catch database of the bigeye tuna Thunnus obesus by longline fisheries in the Atlantic Ocean was constructed in aims to establish the effective fishing operation for the decision of the fishing ground. The monthly data of the bigeye tuna catch by each 5-degree square were input in this database, with the published data from the "Annual report of effort and catch statistics by area on Japanese tuna longline fishery" for 18 years from 1963 to 1980. The monthly and yearly changes of the geographic distribution of the fishing ground can be monitored on the chart by the coulour display (CRT) and the line printer (LPT). The long-term trend of mean catch in each 5-degree square can be also computed and output to CRT and LPT. The practical ap-plication of the catch database was also considered with the simulation program for the fishing operation of the Atlantic bigeye tuna, in aims at the locating of fishing site.