Abstract
The present author has studied on the hydrographic conditions in jack mackerel and mackerel fishing grounds by the purse-seine in the East China Sea. The most important fish species of the catches is the jack mackerel, but the mackerel also caught together with the jack mackerel. The water temperature in well catch conditions is from 13°C in winter to 21°C in spring and the chlorinity ranges from 17.50 Cl ‰ to 19.30 Cl ‰. In view point of the oceanographic structure, it seems that the most important purse-seine fishing grounds for the jack mackerel cover the sea areas which are intermediate zones between the cold water masses extruded from the Yellow Sea and the warm Kuroshio Current in the East China Sea. Especially the sea areas near the coastal water masses in the intermediate zones are valuable as the main fishing grounds in spring.
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