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OALib Journal期刊
ISSN: 2333-9721
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摄食水平和温度对军曹鱼幼鱼生长及氮收支的影响
Keywords: 军曹鱼幼鱼,摄食水平,温度,生长,氮收支
Abstract:
？研究了不同摄食水平(从饥饿至饱食)和温度(21℃、27℃和33℃)对军曹鱼幼鱼(平均初始体重约10g)生长和氮收支的影响,并建立了生长-摄食/温度关系和不同摄食水平和温度条件下的氮收支方程。结果表明,在实验的温度范围内,军曹鱼幼鱼特定生长率均随摄食水平的增加呈显著增长趋势,生长-摄食关系在33℃时表现为线性相关,在27℃和21℃时表现为减速增长趋势,采用对数函数定量描述;在实验的摄食范围内(饥饿组除外),军曹鱼特定生长率随温度增加呈增长或先升后降的变化趋势,两者间的关系均采用二次函数定量描述。在实验的温度范围内,随摄食水平增加,军曹鱼幼鱼食物转化效率在水温33℃和21℃时呈增长趋势,在水温27℃时呈先升后降的变化趋势;在实验的摄食范围内(饥饿组除外),军曹鱼幼鱼食物转化效率随温度增加呈增长或先升后降的变化趋势,饱食时虽然食物转化效率最大值出现在33℃时,但方差分析显示33℃和27℃之间无显著性差异,其他摄食水平组在27℃时有最大值。在实验的摄食水平和温度范围内,军曹鱼幼鱼的排泄氮随摄食水平和温度的增加均呈显著增长趋势。
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