Note on the Life-history of Triacanthus brevirostris TEMMINCK et SCHLEGEL

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As far as we are aware, none ever described in detail the life-history of fish belonging to Scleroderm in Japan, while the, present fish, one of Scleroderm, is a common commercial as well as game fish in Ise and Mikawa Bay. The present study is summerized as follows : (1) The breeding season covers the duration from June to August. The number of eggs the female possesses is counted by examination of the ripe gonad. The result is shown in Table 1. (2) The egg is pelagic. Artificial fertilization is by no means difficult and gives success-ful result. The larvae and the youngs are described and figured (Text-figures). (3) The yearling grows up to ca. 10 cm in body-lenght at the fall of the year. From that it is clear that the small size group (9-14 cm) observable in the breeding season belongs to the 2nd year class. The age-determination is also made by the study of the vertebral bones. The growth rate is shown in Table 5. (4) The male ripens in smaller size than the female. The biological minimum is 12cm in the male, while it is 15cm in the female, and the former belongs to 2nd year class and the latter to 3rd year class.
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