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Free Content Spawning Period and Discovery of Juvenile Acanthaster Planci (L.) (Echinodermata: Asteroidea) at Northwestern Iriomote-Jima, Ryukyu Islands

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In 1984 and in 1985, at northwestern Iriomote-jima, Ryukyu Islands, gonad indices for both sexes of Acanthaster planci showed a rapid decline in June when water temperatures were 27–28°C. This indicated a short breeding season in June, and there was no evidence of a secondary breeding season. Nine juvenile A. planci (0.55–12.5-mm total diameter) were collected in 1984 and 13 juveniles (5.5–14.9 mm) in 1985 at depths of 5.5–18.5 m on the floors of grooves and channels of the fringing reef and in small depressions on the reef slope. Feeding scars near juveniles indicated that they fed on crustose coralline algae.

Document Type: Research Article

Publication date: September 1, 1987

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