Abstract
The composition of the plankton in the Straits of Tsushima is simplest in July. In August and September many species of plankton were found. One hundred and two species of plankton were identified from the samples collected in the Straits of Tsushima during the period from July to September.
In this region the temperate oceanic plankton, such as Ceratocorys horrida, Copilia mirabilis, Ceratium reticulatum f. contortum, Sticholonche zanclea, Haemiaulus Heibergii, Tricodesmium sp., were more abandant than the neretic plankton were only found in South region of the Eastern China Sea.
We are inclined to think that at the Straits of Tsushima the plankton were greatly influenc-ed by the warm currents in summer.
