东海黄姑鱼年龄与生长的初步研究

根据2004年2~4月在舟山沈家门市场采集的117ind黄姑鱼样品,对黄姑鱼的年龄与生长进行了初步研究。结果表明:①目前舟山渔场渔获物中黄姑鱼年龄组成主要以1~2龄的低龄组为主,主要体长在161~263mm之间,主要体重在175.3~354.8g之间;②黄姑鱼体长与体重的关系为:W=1.633×10-5L3.0357;③体长和体重的生长方程分别为:Lt=529.51-e-0.262(t-0.281)]和Wt=2597.41-e-0.262(t-0.281)]2.4164;④体长生长速度方程为:dL/dt=138.729e-0.262(t-0.281),体重生长速度方程为:dW/dt=1644.4056e-0.262(t-0.281)×1-e-0.262(t-0.281)]1.4164,生长加速度方程分别为:d2L/dt2=-36.3470e-0.262(t-0.281)和d2W/dt2=430.8343e-0.262(t-0.281)×1-e-0.262(t-0.281)]0.4164×2.4164e-0.262(t-0.281)-1]。

Age and growth of Nibea albiflora in the East China Sea

Spotted maigre Nibea albiflora is one of the main economic fishes in the East China Sea. Based on the data of samples collected from February to May, 2004 the age and growth were researched. The results are summarized as follows: 1. The age composition in catches of Nibea albiflora on Zhoushan fishing grounds is dominated by 1- and 2- year old fishes. The main body length is between 161mm and 263mm, the main weight is 175.3 g-354.8 g; 2. The relationship between body length and body weight is: W=1.633×10 -5L 3.0357 ; 3. The growth equations of body length and body weight are L_t=529.51-e -0.262(t+0.281) ] and W_t=2597.41-e -0.262(t+0.281) ] 2.4164 , respectively; 4.The equation of growth rate in body length is dL/dt=138.729 e -0.262(t+0.281) , and that in body weight is dW/dt=1644.4056 e -0.262(t+0.281) ×1-e -0.262(t+0.281) ] 1.4164 , the equations of growth acceleration in body length and body weight are d 2L/dt 2=-36.3470e -0.262(t+0.281) and d 2W/dt 2=430.8343 e -0.262(t+0.281) ×1-e -0.262(t+0.281) ] 0.4164 ×2.4164 e -0.262(t+0.281) -1],respectively.