Embryonic Development and Effect of Water Temperature on Hatching of the Blacktip Grouper, Epinephelus fasciatus

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Embryonic development of the blacktip grouper, Epinephelus fasciatus, eggs and the effect of water temperature on their developmental speed, time required from spawning to hatching, and hatching rate were studied. The eggs were pelagic and spherical in shape, measuring 0.74-0.84 mm in diameter, with a single oil globule and a narrow perivitelline space. No pigmentation was discernible in the embryos. Their developmental patterns were similar to those of many other Epinephelus species. Newly-hatched larvae measured 1.67-1.71 mm in total length with 28 (12+16) myotomes and an oil globule in the posterior part of the yolk. High viable hatching rates were obtained at a range of temperatures from around the spawning temperatures and higher. The time between spawning and each developmental stage, including hatching, decreased exponentially with increasing temperature. The relationship between incubation temperature and the time to reach any developmental stage shows an inflection point at 27°C. The temperature characteristics μ and α as well as the Q10 values were higher at temperatures between 18 and 26°C than those at temperatures between 28 and 32°C.
日本水産増殖学会の論文