作　　者： ; ; ; ; ;

机构地区： 广西水产研究所

出　　处： 《中山大学学报（自然科学版）》 2010年第5期87-92,共6页

摘　　要： 采用单因素方差分析等方法分析人工养殖条件下相对密度和季节对菲牛蛭繁殖习性的影响。结果表明,秋冬季节,相对密度对亲蛭产茧率、产茧数和死亡率无显著影响(P>0.05),而孵化率、孵化数、卵茧大小和湿质量在各组间差异显著(P<0.05),其中高相对密度组(50尾/箱)显著低于其他组(P<0.05)。春夏季节,相对密度对产茧率、孵化数和卵茧直径影响不显著(P>0.05),而对产茧数、孵化率、死亡率及卵茧长和湿质量影响显著,其中低相对密度组(5尾/箱)的产茧数和孵化率显著高于其他组(P<0.01),高相对密度组(50尾/箱)的死亡率显著高于其他组(P<0.01),而高相对密度组(50尾/箱)的卵茧长和湿质量却显著低于其他组(P<0.05)。结果显示,不同季节中亲蛭的繁殖指标均在低相对密度组(5尾/箱)获得最佳值,同时相同相对密度下季节对菲牛蛭繁殖具有显著影响,春夏季节的繁殖性能要明显优于秋冬季节,特别是春夏季节的卵茧孵化时间(44 d)明显较秋冬季节(100 d)短。研究获得了菲牛蛭繁殖的最佳相对密度,证实了在华南地区一年多季繁殖的可能性,可为其大规模人工繁殖提供参考。 The effects of broodstock density and season on the fecundity of the Hirudinaria manillensis under experimental conditions was evaluated using single factor analysis of variance and other methods.The results showed that,during autumn-winter,the broodstock density could not influence the fertilization ratio,the mean number of cocoons produced and mortalities of broodstock leeches significantly（P0.05）.Hatching rates,mean hatching numbers of cocoons and the cocoon size and wet weight under different densities were significantly different（P0.05）,and among the four density groups,the density of 50 ind·tank-1 were lower than other groups.In spring-summer,the fertilization ratios,mean hatching numbers of cocoons and the standard diameters of the cocoons produced by the broodstock leeches were not significantly different among the four density groups（P0.05）.The number of cocoon laid by the broodstock leeches,hatching rates of cocoons,mortalities of broodstock leeches,the standard lengths and cocoon wet weights were significantly different among the different densities（P0.05）,and the average number of cocoons laid and hatching rates of cocoons were the highest under the density of 5 ind·tank-1.Mortality under the density of 50 ind·tank-1 was the highest at 29.60±5.55 %,which was higher than those of other groups markedly.Furthermore,the group with 50 ind·tank-1 had the smallest cocoon length and wet weight.These results demonstrated that the reproductive indices of parent leeches were the best optimal at 5 ind·tank-1 density treatment in different seasons,and seasonal change significantly affects the reproductive efficiency of the leech H.manillensis at the same broodstock density.The reproductive efficiency of parent leeches in spring-summer was higher than that in autumn-winter significantly,especially the hatching period in spring-summer（44 d） was fewer than that in autumn-winter（100 d）.In conclusion,this investigation has obtained the optimal breeding density,and demonstrated that the pos

关 键 词： 繁殖习性 菲牛蛭 相对密度 季节

领　　域： [生物学]