香鱼生长特性及体型变化的研究

GROWTH FEATURES AND PATTERN OF BODY FORM CHANGE OF PLECOGLOSSUS ALTIVELIC T. eT S.

本文分析研究了浙江凫溪香鱼的生长及体型变化规律。体重与体长关系为:W(♀)=6.5317×10^(-7)L^(3.6373);W(♂)=7.3756×10^(-7)L^(3.6073)。体长生长式为:L_t(♀)=204.2360/(1+21.8466e^(-0.3903t)),L_t(♂)=197.5000/(1+23.9079e^(-0.4276t)),体重生长式为:W_t(♀)=121.9960/(1+9691.6601e^(-0.8578t)),W_t(♂)=111.3113/(1+11211.5210e^(0.9184t))。体长、体重最快生长期分别在5月、8月。综合考虑香鱼的生长和肥满度变化规律,认为11月份是其合理起捕期。香鱼的体型变化主要发生在体长75mm之前,其中头长变化规律还证明与其食性的转变阶段有着密切关系。

In this paper the relations between body weight and body length of plecoglossus altivelic T. et S. of Fuxi, Zhejiang, is calculated using the formula of Keys (W=bL). The results are:W(fomales)=6.5317×10^(-7)L^3.0373; W(males)=7.3756×10^(-7)L^3.6073.Using the logistic equation (y=K(l+e^((?)+bx))) to check body length and body weight growths, it was found that the fastest rates of body length and body weight growths occurred in May and August respectively. The fullness index rises from November onwards. Body form changes of this fish take place mostly before the body length reaches 75 mm, with changes in head length showing a close relationship to changes in its feeding habits.On the basis of this study, it is considered rational to start capturing operations in November, but such operations in October may also be economic.