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Effects of Salinity Fluctuation Frequency on the Growth, Molting Rate and Hemolymph 20-Hydroxyecdysone Concentration in Juvenile Chinese shrimp, Fenneropenaeus chinensis

查看全文 作　　者：DING [1]Sen;WANG [1]Fang;SUN [2]Hao;DONG [1]Shuanglin 高影响力作者 机构地区：[1]The Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, P. R. China;[2]China National Marine Data Information Service, the State Oceanic Administration, Tianjin 300171, P. R. China高影响力机构 出　　处：《Journal of Ocean University of China》索引2009年第8卷第3期,共6页高影响力期刊 基　　金：supported by funds from the National Natural Science Foundation of China (Grant No. 30571441);the Project of Reward Research Foundation for Talented Young and Middle Aged Scientists of Shandong, China (Grant No. 2006BS07002);the National Great Project of Scientific and Technical Supporting Programs Funded by the Ministry of Science and Technology of China in the 11th Five-Year Plan (Grant No. 2006BAD09A07) 摘　　要：This experiment was conducted to examine the effects of salinity fluctuation frequency on the growth, molting rate and hemolymph 20-hydroxyecdysone (20-HE) concentration for juvenile Fenneropenaeus chinensis with an initial wet body weight of 1.115 g±0.012g. The salinity of the control treatment (represented by D0) was 28 throughout the experiment, whereas treatments D2, D4,D6 and D8 were subjected to different salinity fluctuation frequencies of 2, 4, 6 and 8 d, respectively. The range of salinity fluctuation was 4. The salinity in treatments D2, D4, D6 and D8 was kept at 28 for 2, 4, 6 and 8 d, respectively; each original salinity was decreased abruptly to salinity 24, which first lasted for another 2 d and was then raised to its initial value 28. This constituted a salinity fluctuation cycle and afterwards the cycle repeated. It was found that: 1) The weight gain of shrimp in treatment D4 was 202.9% and significantly higher than that in treatment D0 (P<0.05). The molting rate in treatment D2 was the lowest, while that in treatment D6 was the highest and significantly higher than those in treatments D0 and D2 (P<0.05). 2) The hemolymph 20-HE concentration of shrimps in all treatments was at low levels and increased first gradually during the inter-molt period and then increased sharply. It reached a peak value during the pre-molt stage, and then decreased abruptly during the post-molt stage when the lowest level occurred. 3) During the post-molt stage, the hemolymph 20-HE concentration in treatment D2 was 7.47 pg μL-1 and significantly higher than that in treatment D0 (P<0.05). There were, however, no significant differences in hemolymph 20-HE concentration among all five treatments during the inter-molt stage (P>0.05). During the pre-molt stage, the hemolymph 20-HE concentration in treatment D6 was significantly higher than that in treatment D0 (P<0.05), whereas the hemolymph 20-HE concentration in treatment D2 was significantly lower than that in other treatments (P<0.05). Adequate salinity fluctuation promoted the molting rate through increasing hemolymph 20-HE concentration at the pre-molt stage. 关 键 词：中国海域 幼虾 生长环境 海水盐度
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