| 摘要: |
| 研究了低盐度条件下, 二溴海因和碳水化合物水平对凡纳滨对虾(Litopenaeus vannamei)生长和免疫的影响, 共3 个实验。实验1 研究了二溴海因对凡纳滨对虾存活的影响, 发现在0.2、5 和20 三个盐度水平, 随着二溴海因浓度的升高, 凡纳滨对虾存活率呈下降趋势; 二溴海因对凡纳滨对虾的安全浓度随盐度的增加呈上升趋势。实验2 和实验3 研究了盐度、二溴海因浓度和饲料中碳水化合物水平对凡纳滨对虾生长和免疫的影响, 结果表明: 在低盐度养殖条件下, 凡纳滨对虾长期生活于二溴海因环境中, 可导致对虾处于应激状态, 需要消耗体内较多的免疫因子, 血清酚氧化酶和超氧化物歧化酶活性降低, 生长速度下降, 而在饲料中适量增加碳水化合物不仅可促进对虾生长又可起到饲料蛋白质节约作用。
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| 关键词: 二溴海因 碳水化合物 凡纳滨对虾 (Litopenaeus vannamei) 生长 免疫 |
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| 基金项目:十一五国家科技支撑计划重大项目(2006BAD09A06); 江苏省教育厅青蓝工程项目(QN07008) |
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| Effects of dimethylhydantoin and dietary carbohydrate levels on the growth and immune factors of Litopenaeus vannamei |
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WANG Xing-qiang,MA Shen,CAO Mei,YAN Bin-lun
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| Abstract: |
| Three experiments were conducted to determine the effects of dimethylhydantoin and dietary carbohydrate levels on the growth and immune factors of Litopenaeus vannamei under low-salinity conditions. We found that the survival rate of L. vannamei was decreased with increasing dimethylhydantoin concentrations at salinities of 0.2‰, 5‰ and 20‰. The safety concentrations of dimethylhydantoin was increased with increasing salinities. Under the low-salinity conditions, long-term treatment of dimethylhydantoin environment led to stress in L. vannamei. More immune factors in vivo were consumed, phenoloxidase and superoxide dismutase activity were decreased, and the growth rates were lowed down. An adequate level of carbohydrate provided in diets could not only improve the growth of L. vannamei significantly, but also have a protein-sparing effect.
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| Key words: dimethylhydantoin carbohydrate Litopenaeus vannamei growth immunity |
