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Biological productivities are considered to be very high in the East China Sea and the Yellow Sea. This high productivity supports activities of various fisheries of Japan, China, and the Republic of Korea in this region. From 1984 to 1989 China and Norway carried out joint acoustic and trawling surveys to the biomass of anchovy Engraulis japonicus among other fishes in these seas, and the biomass was estimated to be about 3,000,000 tons.1) Af ter the Chinese-Norwegian joint survey, there have been no reports on the population abundance of anchovy in the area. Japan has not been fishing anchovy in the area for sever al reasons; problems with freezing technology, long dis tance to fishing grounds, low cost benefit, and others. In order to establish rational management scheme of an chovy resources it is primarily important to gain an ac curate estimate of total anchovy biomass. The present study aims at testing feasibility of acoustic method using a quantitative echo sounder for a rapid esti mate of anchovy biomass, and shapes and packing densi ties of its schools.

Acoustic Estimation of Biomass and School Character of Anchovy <i>Engraulis japonicus</i> in the East China Sea and the Yellow Sea