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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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慢性氨氮胁迫对黄颡鱼摄食、生长及血液指标的影响
DOI: 10.3724/SP.J.1145.2011.00824, PP. 824-829
Keywords: 慢性氨氮胁迫,黄颡鱼,摄食,血液指标
Abstract:
挑选规格相近的健康黄颡鱼幼鱼分别饲养在氨氮浓度为3.36mgl-1（a1）、6.72mgl-1（a2）、13.44mgl-1（a3）、26.88mgl-1（a4）的水体中，对照组（a0）用不加外源氨氮的自然晾晒的自来水饲养.每组放养试验鱼30尾，暴露56d.结果表明，非离子氨对黄颡鱼幼鱼的摄食、生长及血液指标存在显著影响（p<0.05），而对鱼体成分的影响不显著（p>0.05）.随着非离子氨浓度升高，高浓度组摄食率明显下降，饲料利用率降低，生长缓慢，特定生长率（specialgrowthrate，sgr）和存活率都较对照组低.血氨浓度随非离子氨浓度升高而显著升高（p<0.01），各处理组血氨浓度远低于其所处环境总氨氮（totalammonia，tan）浓度，而血浆尿素氮（ureanitrogen，ur-n）水平逐渐降低但差异不显著.a3和a4碱性磷酸酶（alkalinephosphatase，akp）活性和皮质醇（cortisol）水平升高较快，a1和a2尽管呈上升趋势，但与对照组差异不显著（p>0.05）.血糖（glucose，glu）浓度总体上表现为降低的趋势，2个高浓度组（a3和a4）下降速度较快.谷丙转氨酶（alamineaminotransferase，alt）和谷草转氨酶（aspartateaminotransferase，ast）活性总体呈升高趋势，非离子氨浓度越大其升高趋势越明显.因此，黄颡鱼幼鱼不宜长期生活在高浓度的氨氮胁迫环境中，适宜的养殖水体中氨氮应该保持在低于6.72mgl-1水平.表5参22
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