Salinity stress on embryos and early larval stages of the pomfret Pampus punctatissimus

文献类型： 外文期刊

第一作者： Zhang, Dong

作者： Zhang, Dong;Zhang, Dong;Shi, Zhaohong;Huang, Xuxiong;Fu, Rongbin;Wang, Haiping;Luo, Haizhong;Chen, Bo;Liu, Minghai

作者机构：

关键词： abnormalities;embryonic development;embryos;fish eggs;hatching;larvae;oocytes;salinity;stress;stress response;Pampus;China

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

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收录情况： SCI

摘要： The pomfret, Pampus punctatissimus, is an important fisheries resource in China and a valuable and highly esteemed fish species on the Chinese market. It is currently being evaluated as a candidate for mariculture to meet increasing demand. To better understand the tolerance of this species to varying environmental salinity at early developmental stages, the effects of salinity on egg buoyancy, embryo development, egg hatching, and morphology of early larva were determined. Egg neutral buoyancy was seen at 25-29 per mil salinity. Below 20 per mil salinity, all eggs sank, and above 30 per mil salinity, all floated on the surface. Time to first hatching was 24-28 h at 26-28 degrees C in all salinities, but eggs/embryos exposed to salinities <=10 per mil died. Hatching rates decrease substantially at salinities <=25 per mil and >=40 per mil, and the highest hatching rate (68.2%) occurred at 29-32 per mil. The percentage of abnormalities of newly hatched larvae was lowest at 29-30 per mil salinity, lower (<=25 per mil) and higher (>=40 per mil) salinities resulted in significantly higher percentage of abnormalities. The results on buoyancy, hatching rate, and early larval deformity, indicate that fertilized eggs of P. punctatissimus only develop well in a narrow range of salinities. We conclude that the optimal salinity for successful development of fertilized eggs lies between 29 and 32 per mil where neutral egg buoyancy, highest egg hatching rate, and lowest incidence of abnormality rate was observed.

分类号： S9

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