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=529.5[1-e -0.262(t+0.281) ] and W_t=2597.4[1-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.