Abstract
Copepod swarming and mysid schooling were reviewed from previous literatures and the
author's recent observations. Aggregations of mysid and copepod occurred near to the sea bottom
in accordance with bottom material and configuration ; above and inside eelgrass and algal beds,
downstream side ofrocks, above sandy bottom and so forth. Copepod swarms observed in Shijiki
Bay, a small inlet southwest of Hirado Is., western Kyushu, Japan, consisted of many copepodite
stages sometimes of a single species but also of a mixture of severalspecies. The swarm of
copepods was maintained stationary in the spatial position when water current was weak. But
when current was strong; swarm was carried away from the initial position. Copepod swarms
were able to induce in the lee of black boxes set on the flat sandy bottom. Forming process and
adaptive significance of mysid schooling and copepod swarmmg were discussed.
