Abstract
The reproductive behavior of damselfish,Chromis notata, was studied at Mukaishima Island, Seto Inland Sea of Japan. Spawning occur synchronously among the fish in the study area except during a part of the breeding season. Neither spawnings nor hatchings, however, coincide with any particular phase of the lunar or tidal cycle. The intervals between the spawning peaks vary considerably during the breeding season. These results support the hypothesis that synchrony of breeding is facilitated by social interactions among the fish of a local area. The male inter-spawning intervals, and even the intervals between last spawning and next nesting, are longer than the female inter-spawning intervals in the beginning of breeding season. This delay of male spawning is attributed to the long incubation period and may have an influence on the male reproductive success.
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