文章摘要
郑乐云,杨求华,黄种持,吴精灵,陈新明.循环水养殖密度和氨氮对斜带石斑鱼生长和免疫力的影响[J].上海海洋大学学报,2013,22(5):705-712
循环水养殖密度和氨氮对斜带石斑鱼生长和免疫力的影响
Effect of the breeding density and ammonia nitrogen on growth and immunity of Epinephelus coioides in recirculating system
  
DOI:
中文关键词: 斜带石斑鱼  水质  生长  摄食  免疫指标
英文关键词: Epinephelus coioides  water quality  growth  feeding  immune parameter
基金项目:福建省石斑鱼种业创新与产业化工程建设[闽种石斑鱼(004号)]
作者单位
郑乐云 福建省水产研究所 
杨求华 福建省水产研究所 
黄种持 福建省水产研究所 
吴精灵 福建省水产研究所 
陈新明 厦门小嶝水产科技有限公司 
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中文摘要:
      选取平均体重为146.3 g/尾的斜带石斑鱼450尾分成3个密度组进行饲养,分别为低密度组D1(100尾/m3,14.6 kg/m3)、中密度组D2(150尾/m3,21.7 kg/m3)和高密度组D3(200 尾/m3,29.5 kg/m3),比较不同养殖密度引起的水质变化对斜带石斑鱼的生长性能、摄食率和免疫力的影响。结果表明:水体中氨氮含量随斜带石斑鱼养殖密度的增加而增加(P<0.05);斜带石斑鱼的摄食率随水体中氨氮浓度的增加而显著下降(P<0.05)。随着养殖密度的增加,斜带石斑鱼的生长速度呈现负相关性,各试验组的特定生长率分别为1.07、0.66、0.47;各实验组斜带石斑鱼体重也出现显著性差异(P<0.05),各实验组的尾均增重量分别为118.5 g、63.3 g和44.1 g;养殖密度对斜带石斑鱼的饵料系数和成活率无显著影响(P>0.05);斜带石斑鱼的免疫指标血清溶菌酶(LZM)、碱性磷酸酶(AKP)和超氧化物歧化酶(SOD)随养殖密度的增加而下降,随养殖时间的延长呈现出先上升后下降的趋势。阐明了养殖密度引起养殖水质状况的改变,继而影响斜带石斑鱼摄食率的变化,从而造成石斑鱼的生长性能出现显著性差异,可能是养殖密度对斜带石斑鱼生长性能影响的机制之一。
英文摘要:
      In this paper, we studied effect of the breeding density and water quality on Epinephelus coioides in the growth, feed coefficient and immunity. Total 450 groupers whose average weight was 146.3 g/tail were divided into three experiment densities. The initial densities were 14.6, 21.7 and 29.5 kg/m3, respectively. The results showed that, the content of ammonia nitrogen was influenced significantly (P<0.05) by the stocking density, and the feeding rate of Epinephelus coioides showed a significant negative correlation with the ammonia N maintained time and concentration. Under the same experiment conditions, higher stocking densities have a negative effect on fish growth. The specific growth rate of the three treatments was 1.07, 0.60 and 0.47, respectively. With the augmentation of density, the weight of experiment groups showed a significant difference, in which the weight gain of each treatment was 118.5, 63.3 and 44.1 g, respectively. It was also found that the stocking density had insignificant impact on feed coefficient rate and survival rate. The immunity content of lysozyme (LZM), alkaline phosphatase (AKP) and superoxide dismutase (SOD) decreased with increased density, and showed a trend of increase at first and then decreased with the extension of culture period. The article revealed that one mechanisms of breeding density influenced Epinephelus coioides growth, maybe density caused water quality to change, which in turn affects the feeding rate of Epinephelus coioides, and resulting in the significant difference in growth performance of different density grouper.
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