西藏曲松下洛国家湿地公园短尾高原鳅的体长体重关系和性腺相关特征

Relationship of Body Length and Weight and Gonadal Related Characteristics of Triplophysa brevicauda in the Xialuo National Wetland Park of Qusong County,Tibet

文章对短尾高原鳅的体长体重关系和性腺相关特征进行研究,为湿地公园短尾高原鳅资源保护及利用提供理论支持。于2020年11月,在西藏山南市曲松县江扎布河采集136尾短尾高原鳅,体长主要集中在60~70 mm,体重主要集中在2~3 g。雌鱼和雄鱼体长和体重关系呈幂函数,但雌、雄之间差异较显著(P<0.01),雌雄体长体重关系分别为W_(♀)=0.0001L^(2.4547)(R^(2)=0.8482),W_(♂)=0.0004L^(2.1612)(R^(2)=0.759),b值与理论匀速生长值3之间差异显著(P<0.05),雌雄群体均为异速生长,群体性比为0.6∶1。短尾高原鳅雌鱼性体指数、肥满度和肝体指数均显著高于雄鱼。

In this study,the relationship of body length and weight,and gonadal related characteristics of Triplophysa brevicauda in the Xialuo National Wetland Park were analyzed to provide scientific basis for the resources protection and utilization of T.brevicauda.136 samples of T.brevicauda were collected in the reaches of the Zhabu River of Xialuo National Wetland Park in November 2020 and measured the body length and weight.The results showed that body length and body weight of T.brevicauda were mainly concentrated in 60∼70 mm and 2∼3 g,respectively.The relationship between body length and body weight of females and males showed a power function,but the difference in the power function between females and males was significant(P<0.01).The relationship between body length and body weight could be expressed as W_(♀)=0.0001L^(2.4547)(R^(2)=0.8482)for female and W_(♂)=0.0004L^(2.1612)(R^(2)=0.759)for male,the b value of male and female fish was significantly different from theoretical uniform growth value of 3(P<0.05)and an allometric growth was detected in both male and female groups within the group sex ratio of 0.6/1 in male to female.The gonadal-somatic index,fatness and hepatosomatic index of females were significantly higher than those of male fish.