抄録
Behavioural features of artificially-bred juvenile red sea bream after stocking were reviewed. Several
marking methods which have been used for stocking program were also evaluated by adopting the territorial behaviour
as a behavioural index. The pigrnent injection method showed the least effect on their behaviours and was
suggested to be the best marking method. After first stocking, three types of individuals showing distinct behaviours
were distinguished : 1) territorial individuals, 2) territory-like individuals, 3) individuals keeping no
restricted cruising area. Just after stocking, all fish were the type 3). Then, fish of the types l) and 2) increased in number gradually and became almost constant, which suggests that there exists a carrying capacity for
the released population of red sea bream. However, the types 1) and 2) did not show a distinct increase in the
second stocking. The differences in the recruitment pattem between the first and second stocking groups suggest
that the effect of prior residence works, intermediated by the territorial behaviour.
