嘉陵江下游短体副鳅繁殖群体结构的研究  

Study on the Composition of the Reproductive Population of Paracobitis potanini in the Lower Reaches of the Jialing River

作　　者：宋玉东[1] 熊丽娜[1] 赵桥弟[1] 邓玉江[1] 王志坚[1] 

机构地区：[1]西南大学生命科学院水产科学重庆市市级重点实验室,重庆400715

出　　处：《安徽农业科学》2009年第1期169-170,176,共3页Journal of Anhui Agricultural Sciences

基　　金：国家支撑计划项目资助(2006BAD03B0904)

摘　　要：[目的]研究短体副鳅繁殖群体的结构特征,积累副鳅属鱼类的生物学资料。[方法]对采自嘉陵江的208尾繁殖季节的短体副鳅成熟个体年龄、体长、体重及雌雄生长特性等进行研究。[结果]繁殖群体的性比为♀∶♂=5.71∶1.00。繁殖群体由1~5龄鱼组成,以2~3龄组为主。短体副鳅的体长范围为49.0~84.0 mm,体重范围为2.6~11.0 g。最小性成熟年龄是1龄;最小性成熟个体雌性体长49.0mm,体重2.6 g;雄性体长55.5 mm,体重3.7 g。群体体重（W）与体长（L）的关系：雌＋雄为W=0.000 2×L2.477 2;雌为W=7.0×10-5×L2.753 5;雄为W=0.002 1×L1.896 4。生长系数雌性大于雄性;繁殖群体（雌＋雄）的生长系数b=2.477 2〈3,说明短体副鳅个体发育正常呈异速生长趋势。[结论]短体副鳅的生长峰值均出现在性成熟后1~2年内,最佳捕捞期应该在3龄以后。[Objective] The composition of the reproductive population of Paracobitis potanini was researched to collect its biological data.[Method] The age,the length and weight of the body and sex of 208 Paracobitis potaninis collected from the Jialing River in the reproductive period were tested.[Results] The ratio of ♀∶♂ was 5.71∶1.00.The age of the reproduction population was 1-5 years old, and the dominator population was with 2-3 years old.The length and the weight of its ranged from 49.0 mm to 84.0 mm and from 2.6 g to 11.0 g,respectively.Both mature male and female fish at 1 year old could be founded in the reproduction population.The size of matured female was 49.0 mm in length and 2.6 g in weight while those of matured male were 55.5 mm and 3.7 g,respectively.The relationship between weight and length was described as follows： W=0.000 2×L2.477 2（N=208,R=0.822 3）（male and female）,W=7.0×10-5×L2.753 5（N=177, R=0.848 7）（female） and W=0.002 1×L1.896 4（N=31,R=0.746 9）（male）.The growth coefficient（value of b） of female was bigger than that of male,and the value b in reproductive population（female and male） was 2.477 2（less than 3）,which showed that the henogenisis of Paracobitis potanini was of the type： allometric growth.[Conclusion] The growth of Paracobitis potanini would achieve the peak in 1 or 2 years after maturing and the best catching time was after 3 years old.

关 键 词：短体副鳅 繁殖群体结构 特种鱼类 性比 生长特性 

分 类 号：S966.4[农业科学—水产养殖]