作　　者： ; ; ; ; ; ; ; ; ; (孙龙芳）;

机构地区： 华中农业大学水产学院农业部淡水生物繁育重点实验室

出　　处： 《广东农业科学》 2014年第11期126-130,共5页

摘　　要： 为了解早期分级筛选对加州鲈和乌斑的生长及水质影响,用网箱将加州鲈(3.15±0.12 cm)和乌斑鱼苗(1.59±0.08 cm)3次分级培养,每次分级将试验鱼按规格大小分成3个密度培养7 d。结果发现,经过21 d的分级培养,两种鱼体质量和全长随密度增加而降低,但差异不显著;乌斑成活率随着分级培养显著提高。加州鲈和乌斑的整齐度随分级显著提高,体长变异系数平均值却随分级下降,并且差异显著。经过分级培育,饲养水体中氨氮、总氮和亚硝酸水平显著升高,总磷指标也随分级升高,并且差异显著。结果表明,早期分级培养有助于提高加州鲈和乌斑鱼体规格齐整性,并让乌斑的成活率提高21.92%,但对加州鲈的成活率没有显著影响。 This experiment studied the effects of early size grading on growth and water quality of Micropterus salmoides and the hybrid of Channa orgus ♀ ×C. maculata ♂ . Juvenile M. salmoides （3.15 ± 0.12 cm） and the hybrid of C. orgus ♀ ×C . maculata ♂ （1.59 ± 0.08 cm） were size graded by net cage three times in the same pond. Moreover, the experiment fishes should be divided into three densities breeding for 7 d according to the size in each grading. After 21 d of classification, body weight and length of M. sdmoides and the hybrid of C. orgus ♀ ×C. maculata ♂ reduced with density increasing, but the difference was not significant. The survival rate of M. salmoides significant increased with hierarchical breeding. Uniformity of two experiment fishes significant increased with hierarchical breeding, while the average body length variation coefficient significant declined. The content of NH4^＋-N, TN, NO2-N and TP in breeding water significantly elevated with hierarchical breeding. Test results showed that the early classification could improve the uniformity of M. salmoides and the hybrid of C. orgus ♀ ×C. maculata 3 , also could effectively improve the survival rate of the hybrid of C. orgus ♀ ×C. maculata ♂ by 21.92%, but had no significant impact on the survival rate of M. salmoides.

关 键 词： 加州鲈 乌斑 分级培养 存活率 水质

领　　域： [农业科学] [农业科学]