Year Round Spawning of Reared Blacktip grouper, Epinephelus fasciatus, in Chichi-jima, Ogasawara Islands, Southern Japan.

概要

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In the periods from 1986 to 1998, spawning of broodstock of blacktip grouper, Epinephelus fasciatus, obtained from coastal waters around Chichi-jima, one of the Ogasawara Islands, was observed under the rearing condition. No artificial treatments such as hormonal injection, water temperature shock, or photoperiod shock was performed to induce maturation. Although year round spawning was observed, about 90% of the eggs were obtained from April to November, when water temperature varied between 19.5 and 29.7°C . The average diameter of the buoyant eggs ranged from 717 to 847μm and significantly showed a negative correlation with spawning water temperature. The number of spawning eggs peaked a few days after full moon.
日本水産増殖学会の論文