東京湾におけるカタクチイワシの游泳層について

抄録

In this paper, the author analysed both the record of fish finder and the data of catch attained at the same time by a sardine purse seine boat operated in Tokyo Bay during 1950-1957, and the following results are obtained;
1) The depth of water where anchovy shoals swim tends to change with hour of a day, becoming rather shallow in the morning and in the evening as compared with in the daytime.
2) The depth of anchovy shoals in the water differs depending on fishing ground and weather but does not vary with size of fish and seasons.