养殖型暗纹东方鲀生长与发育特性

观测养殖型暗纹东方鲀，获得4个年龄组的生长数据和解剖资料。拟合出雌、雄的体长体重关系和生长方程，分析其肥满度、胸腹围特点以及性腺和肝脏发育特点。结果显示，养殖型暗纹东方鲀雌雄体长生长规律相似；但体重在2．5龄前雄鱼生长速度大于雌鱼，2．5龄后则相反。养殖暗纹东方鲀体型比野生暗纹东方纯肥胖。体重／体长和肥满度皆大于野生型。研究还发现，养殖暗纹东方鲀性腺发育不良和肝脏脂肪变性发生率高，且两者的发生存在一定关系，致使全人工育成的成鱼繁殖难以成功。

Growth and development characteristics of captive Takifugu obscurus

The growth data of captive Takifugu obscurus at four ages were collected. The relationship between standard length(SL) and total weight(TW) was described by the von Bertalanffy growth equation. The Fulton's condition factors and characteristics of breast girth (BG) and venter girth (VG) were estimated, and the development characteristics of liver and gonad were analyzed by anatomical observation. It was found that length growth of captive ones was not significantly different between sexes. The weight of males increased more quickly than that of females before 2.5 age, but it was contrary after 2.5 age. The length growth rate decreased with the age, while weight growth rate rose with age before 2.0 and then declined gradually after that. The result also howed that captive Takifugu obscurus was fatter than wild ones due to the accumulation of nutrition, both its weight-to-length ratio and Fulton coefficients were higher than the latter's. In addition, poor development of gonad and hepatization often occurred to the captive ones. The study also explained the biological signification of the parameter b in the power function: W=aL~b