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- W2394080849 abstract "The culture of grouper is a lucrative enterprise in southern China because of the growing demand for it in the local and international markets.Epinephelus coioides,is a common and commercially important serranid fish and spawns readily in captivity.However,larval survival rate at the completion of metamorphosis is low.In order to improve larval survival rate,more detailed information on early larval development is needed to improve rearing techniques.The development of the technique should be based on the intensive biological research on the larval stage,and controlling their early life history with more intense care.The embryonic development,morphological development of larva,juvenile and young fish of orange-spotted grouper Epinephelus coioides are dealt with in this paper.The morphological features and the developmental time of 28 embryonic developmental stages were described in great detail from fertilization to hatching.Based on the data obtained,the embryonic development of orange-spotted grouper was divided into five stages,named cleavage stage,blastula stage,gastrula stage,neurula stage as well as organogenesis stage.Under the sea water of temperature(25±0.5)℃,salinity 31.0,pH 7.8,it required 28?h 30?min for the orange-spotted grouper embryonic development.The post embryonic development of orange-spotted grouper was divided into larval stage,juvenile stage as well as young fish stage,based on the features of the yolk-sac,pelvic fin spine,second dorsal fin spine,scale and body color.Accordingly,the larval stage was further classified into early larva and late larva,with or without yolk-sac,respectively.After 36 days rearing in the sea water of temperature 24.5-29.2?℃,salinity 28.8-33.5,pH 7.5-8.5,the fast growing larvae among the others developed into juveniles;after 42 days,the fast growing juveniles among the others completed metamorphosis and changed into young fish.The extension and shrinkage of the pelvic spine and the second dorsal spine as well as the spinules on aforementioned spines represented the most apparently changes during the post embryonic development of orange-spotted grouper.The larvae behave differently after each of such changes,therefore,the care of the larvae should fit to these differences." @default.
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- W2394080849 date "2006-01-01" @default.
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- W2394080849 title "Embryonic development, morphological development of larva, juvenile and young fish of Epinephelus coioides" @default.
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