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- W847111116 abstract "The relationship between the catches of tuna and hydrographic conditions in South-East Pacific region (latitude , longitude ) was investigated by using the catch data of tuna and Digital Bathythermograph (DBT) data from December 9, 1980 to April 2, 1981. The results are as follows : The study area were located in South Eguatorial Current regions including equatorial upwelling regions in . The horizontal mean temperature at the depth of 10m on the first quarter months in the study area was about C and the salinity of those fishing areas ranged from 34.8 to . Yellowfin tuna and bigeye tuna were mainly caught in SW vertical temperature profile type, which the depth of thermocline ranged from loom to 300m, and temperature difference of thermocline was about . The deeper the depth of thermocline, the more the catches of tuna. While albacore tuna was caught well in SS vertical temperature profile type which the temperature of thermocline ranged from and its gradient was very smooth. The depth of 1 ml/l surface of dissoved oxygen content ranged from loom to 200m in the South-East Pacific between longitude , but it was shallower than 100 m near the North-South American continent. The catches of bigeye tuna were larger than those of yellowfin tuna in South Equatorial Current region. As approaching to the South and North American continent, the catches of yellowfin tuna and bigeye tuna decreased because the thermocline becomes shallower and steeper and the depth of the 1 m1/1 surface of dissolved oxygen content became shallower." @default.
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- W847111116 date "1987-01-01" @default.
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- W847111116 title "Relationship between the Catches of Tuna and Oceanographic Conditions in the South-East Pacific" @default.
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