Study on Fecundity of Xenocypris Microlepis in Daoguanhe Reservoir, Hubei Province

研究了道观河水库细鳞鲴的个体生殖力。细鳞鲴样本由2+-5+龄鱼组成,其个体绝对生殖力与体长、体重和年龄分别呈直线、对数函数和幂函数相关,体长相对生殖力与体长、体重和年龄分别呈双曲线、对数函数和幂函数相关,体重相对生殖力与它们相关不显著。多元逐步回归分析其绝对生殖力和体长相对生殖力均与体重和成熟系数密切相关,而体重相对生殖力仅与成熟系数相关。;Daoguanhe Reservoir(30°52'N, 114°59'E)situated in Wuhan, Hubei Province of China, is a middle-sized hilly-lake reservoir built in 1968.X.microlepis is the main fish and made up of 15% of fish product in the reservoir during 1985-1988.But the production of X.microlepis declined in recent years, the fecundity of X.microlepis from Daoguanhe Reservoir was studied for utilizing its resource sustainably during April to May 2001.The scales used as aged material.The indices were measured with the routine method.All data was analyzed with STATISTCA soft Relationship between its' fecundity and indices imitated with 8 kinds of mathematic expressions.One hundred and ten specimens were colleted belonging to the age of 2+-5+.Relationship between its' absolute fecundity (F) and body length(L), body weight(W) and age(A) could be expressed with the linear, logarithmic and exponential equation, respectively.Relationship between relative fecundity per centimeter(FL) and body length, body weight and age could be described using the hyperbolic, logarithmic and exponential equation, respectively.The equations (P<0.01) as follow: F=-13.414+0.756 L R2=0.8786 FL=-1.459+0.521 InL R2=0.7664 F=-29.322+6.326 In W R2=0:8692 FL=-0.712+0.168 In W R2=0.7626 F=1.012 A1.266 R2=0.7877 FL=0.0666 A0.882 R2=0.6824 The number of felative fecundity per gram mainly ranged from 150-250 and averaged 212.Multi-regressive analyses showed its absolute fecundity and relative fecundity per centimeter were significant related with body weight and maturing coefficient, and relative fecundity per gram(Fw) only with maturing coefficient: F=-2.846+0.0192 W+0.216GSI, (n=110,R2=0.9182,P<0.001) FW=78.336+8.415 GSI,(n=110, R2=0.4104, P<0.001)