大亚湾丽叶鲹的年龄、生长和个体生殖力

A study of age and growth and the individual fecundity of Caranx(Atule) kalla in Daya Bay

本文以耳石作依据对大亚湾丽叶鲹的年龄和生长进行了研究。报道了其年轮特征、年龄组成、体长与体重的分布;给出了丽叶鲹的体长与体重、体长与耳石长的关系和生长方程;采用重量法求得了180尾雌鱼的怀卵量,并计算了其绝对生殖力和相对生殖力及其与体长和体重的关系;分析了卵径分布、性成熟系数的月变化及幼鱼的生长情况。

Altogather 1973 specimens or Caranx(Atule) kalla were stuated oy examining me oto(?)s for age determination. The specimins were collected from the Daya Bay in the period from April to December in 1987. Growth study was made by moons of otoliths methods. The following expressions were derived: W=2.022×10^(-5)L^(2.967) (n=1387,r=0.9586) W=0.2584 exp(4.157×10^(-2)L) (n=623,r=0.9840) L_t=L_∞{1—exp[—k(t—t_0)]}=135.0{1—exp[—0.738 3(t+0.073)]} W_t=W_∞{1—exp[—k(t—t_0)}_b,= 45.4 {1—exp[—0.7348(t+0.0649]}^(2.967) where W and L respectively represent body weight and standard length. W_t is body weight in grains at the age of t and Lt is standard length in mm at the age of t. Based upon 180 speciments studied,the individual absolute fecundity varied between 21 392 and 98 280(average, 45 591);the individual relative fecundity E/L varied between 223 to 819 eggs/mm (average, 427 eggs/ram) and E/W range from 1337 to 3510 eggs/g (average, 2576 eggs/g). The relations of individual ablolute fecundity(E) and individual relative fecundity E/L to length are curred and to weight are linear. The individual relative fecundity E/W does not increase or decrease markedly with length and weight.