Abstract
Annual reproductive cycle of the chiton Acanthopleura japonica (Lischke) was studied by observing both gonad index and histological features from October 1980 to October 1981. No significant changes in each factor were observed from October to April. Increased values of gonad index and spermatogenesis or vitellogenesis in gondas were observed from May to September. In the same time, gonad index decreased and sperms or oocytes in gonalds disappeared in the days around spring tide, and they were recovered around neap tide. Suggested spawning around spring tide from May to September is also supported by the occurrence of released eggs in the days around the new and full moons.
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Communicated by M. Anraku, Tokyo
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Yoshioka, E. Annual reproductive cycle of the chiton Acanthopleura japonica . Mar. Biol. 96, 371–374 (1987). https://doi.org/10.1007/BF00412520
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DOI: https://doi.org/10.1007/BF00412520