Studies on the Constitutional State of Skipjack Fishing Ground over the Waters near the Tokara Retto (I) : On the Relation between the Water-temperature and the Catching Condition in the Fishing Ground

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  • トカラ列島近海におけるカツオの漁場構成に関する研究(第1報) : 漁場水温と漁況について

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In the Tokara Sea, the skipjack fishing water-temperature is about 20°~30°C throughout a year. And during the term when the water-temperature shows comparatively high and low degrees within the limits of 20°~30°C no temperature variation is to be abserved through the sea conditions, with good catches of the skipjack. At the term when the sudden ascent and descent of water-temperature occurrs in the fishing ground some remarkable time variation in the sea condition becomes to be noted, with poor skipjack catches. As to the horizontal distribution of water-temperature, when the fishing ground shows a higher and more constant temperature than the other ones, the good skipjack catching is to be expected on the ground. From the above mentioned results it is assumed that the catching condition over the Tokara Sea may be expected to be good, provided that the water-temperature estimated both from the terminal and spatial view points is kept comparatively constant, and moreover that it is confronted by the opposite inconstancy.

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