On the Behaviour of the Crimson Tai Found Near an Artificial Fish-Reef Near the Coast of Nagasaki, Japan

Abstract

The results of three test catches conducted outside Nagasaki port, at places 20m, 40m, and 60m away from an artificial fish-reef, in early November 1963 and in late January 1964, elucidated that (1) the shoals of red sea bream over 3 years old (consisting chiefly of those whose fork lengths were 30cm-32cm) in this area can be found not only in autumn, their spawning season, but also in winter, (2) the young found in autumn went away from the reefs in winter and (3) the horizontal distribution of this fish at night was most concentrated at places 20m-40m away from the artificial fish-reefs both in autumn and winter.