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Journal of Ethology

, Volume 18, Issue 2, pp 105–108 | Cite as

Semilunar spawning cycle of the humbug damselfish Dascyllus aruanus

  • N. Mizushima
  • Y. Nakashima
  • T. Kuwamura
ARTICLE

Abstract

A very distinct semilunar spawning cycle was found in a population of the damselfish Dascyllus aruanus on the coral reefs of Sesoko Island, Okinawa. Spawning occurred from June to September, only in the early morning, during a period of 2–4 days immediately before or around the time of the new and full moon. Males cared for the eggs deposited on the substrate for 2.5 days until hatching. Hatching occurred just after sunset, i.e., at the high tide of spring tide; the strong ebb current then would rapidly disperse the newly hatched larvae offshore. Females tended to synchronize spawning in a male's nest, also because multiple clutches in a nest would be more likely to survive until hatching. Thus, the distinct semilunar spawning cycle may favor females in reducing mortality of both eggs and larvae.

Key words Spawning cycle Semilunar Damselfish Dascyllus aruanus Paternal care Synchronized spawning Subtropical Japan 

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Copyright information

© Japan Ethological Society and Springer-Verlag Tokyo 2000

Authors and Affiliations

  • N. Mizushima
    • 1
  • Y. Nakashima
    • 1
  • T. Kuwamura
    • 2
  1. 1.Department of Zoology, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan Tel. +81-75-753-4099; Fax +81-75-753-4113 e-mail: nozomi@ci.zool.kyoto-u.ac.jpJP
  2. 2.Faculty of Liberal Arts, Chukyo University, Nagoya, JapanJP

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