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This report is concerned in the catching variation of hair-tails, croacker and Korean prawn by steam trawler in the Eastern China Sea. The data of this report are based on catching records which are presented by a fishing company. Some conclusions may be brought as follows: variations of catches relating to a time, when fishing is done in daytime or night, have nothing to do with the ability of trawlers themselves, nature of fishing grounds and also trawling technique, have concern with vertical movements of fishes and also their gathering and distribution, which are influenced by the environments. a) Correlation between catches and tidal current was not so remarkable (Fig. 3. a), b) ). b) Some variations of catches were obtained from different growth stages of the same species, and were concerned with the time when fishing was done during daytime or not (Fig. 2. a), b)). c) Diurnal light intensities correlate with variations of the catches.

VARIATION OF THE CATCHES IN DAYTIME AND NIGHT ON SOME SPECIES OF FISHES BY TRAWL NET