博斯腾湖草鱼生长特征的研究

The growth of Ctenopharyngodon idellus in Bositeng Lake in Xinjiang

根据2014年8月采集的33尾标本对博斯腾湖草鱼(Ctenopharyngodon idellus)的生长特征进行研究。以鳞片为年龄和生长退算材料,研究结果显示:博斯腾湖草鱼体重与体长表现为异速生长,关系式为W=0.0444SL^(2.8322)。用退算体长拟合的von Bertalanffy生长参数为:SL_8=103.7664 cm,k=0.1385/y,t_0=-0.0542 y。体重生长参数为:W_8=22.7674 kg,k=0.1385/y,t_0=0.0027 y。生长特征指数为3.16;生长拐点年龄为7.5龄,拐点时体长和体重分别为67.3 cm和6.6 kg。与1979年和2000年种群相比,受饵料供给不足的制约,博斯腾湖草鱼生长速度明显下降。草鱼增殖管理措施的制定应以恢复沉水植物资源为目标,具体措施包括:减少草鱼的投放量,草鱼最小捕捞规格降至3 kg,提高草鱼的捕捞强度和捕捞量。

This paper deals with growth characteristics of Ctenopharyngodon idellus based on the 33 specimens collected in Bositeng Lake in August 2014. The ages and growth characteristics of Ctenopharyngodon idellus were determined by scale reading. The body weight increasesallometrically with the body length. The length- weight relationship can be described by the following equations： W = 0. 0444SL^（2. 8322）. Growth could be described by von Bertalanffy equation with the growth parameters： SL_8= 103. 7664 cm,k = 0. 1385 / y,t_0=- 0. 0542 y,and weight growth parameters： W_8= 22. 7674 kg,k =0. 1385 / y,t_0= 0. 0027 y, = 9. 5875. The inflexion point of age for body weight growth and the corresponding body length and body weight is at 7. 5 years,67. 3 cm and 6. 6 kg. Constrained by the lack of food supply,the growth rate of Ctenopharyngodon idellus has significantly declined comparing with that of 1979 and 2000. In consequence,the recoverable resource of aquatic macrophyte should be as one important objective of the proliferation of Ctenopharyngodon idellus. The concrete measures include reduce Ctenopharyngodon idellus releasing,lowing the fishable size to 3 kg and increase the fishing intensity and quantity of Ctenopharyngodon idellus.