Reproductive Mode of Blue-striped Angelfish Chaetodontoplus septentrionalis in the Northeastern Taiwan
Date Issued
2005
Date
2005
Author(s)
Chen, Kuan-Yu
DOI
zh-TW
Abstract
Blue-stripe angelfish Chaetodontoplus septentrionalis (Temminck & Schlegel 1844) which is a coral reef fish distributed from Hong Kong, through Taiwan to southern Japan. It is an important marine ornamental fish and quite potential in the aquaculture industry. However, the fundamental knowledge of reproductive biology for artificial propagation of this species is rarely described. To understand the spawning periodicity, the gonadosomatic index (GSI) and histology of the gonad were examined based on the 164 adult-color individuals collected from the reef zone of I-Lan in the northeastern Taiwan during the period from January 2003 to January 2004. The total length of the specimens ranged from 143.1 ~ 215.4mm. Sex ratio of the fish was dominated by males (♂:♀＝91:64). The mean (±SD) total length was not significantly different (P＞0.05) between male (180.7±13.9mm) and female (172.8±12.0mm). GSI of the females significantly increased from late spring to mid summer (May ~ July), but GSI of the males increased early and declined late (March ~ August). The histology of the ovary indicated that this fish is a partial spawner with synchronous occurrence of previtellogenic and vitellogenic oocytes and secondary oocytes during spawning season. Temperature is probably the principal factor in determining the spawning cycle of the coral reef fish, which leads to the reef fishes in the tropical area spawn throughout the year. However, the coasted waters in subtropical Taiwan is influenced by the prevailing northeast trade wind and the temperature decreased to lower than 20℃ in the water that leads to blue stripe angelfish spawn only in the summer.
Subjects
蓋刺魚
生殖生物學
生殖腺成熟度指數
angelfish
reproductive biology
gonadosomatic index
SDGs
Type
other
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