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通过对各周年生长阶段的养殖美洲鲥(Alosa sapidissima)体长、体重的测量与分析,研究了工厂化养殖美洲鲥的周年生长特性。养殖美洲鲥雌雄鱼的体长与体重关系均呈幂函数增长相关,其方程分别为,雌:W=0.8062×10~(-5) L~(3.1113)(n=122,R~2=0.997 5,P<0.01);雄:W=1.0047×10~(-5) L~(3.0574)(n=125,R~2=0.997 5,P<0.01),b均接近于3,呈等速生长;雌雄鱼生长均可分快速生长期(0~+龄)、稳定生长期(1~+龄)、生长衰老期(2~+龄)三个时期,雌鱼生长快于雄鱼。拟合出von Bertallanffy生长方程,雌:Lt=467.92(1﹣e~(-0.5748(t+0.1710))),Wt=1637.72(1﹣e~(-0.5748(t+0.1710)))~(3.1113);雄:Lt=389.21(1﹣e~(-0.7374(t+0.1975))),Wt=834.08(1﹣e~(-0.7374(t+0.7189)))~(3.0574)。雌雄鱼体重生长拐点分别位于1.517 8 a和1.224 7 a,属性成熟拐点,拐点前生长较快;拐点后,特别是性成熟后(2龄),2~+龄鱼的生长速度明显降低;同时,2龄鱼繁殖季节过后会出现大量死亡。建议商业化工厂化养殖美洲鲥以2龄前上市为宜。
Through the measurement and analysis of body length and body weight of Alosa sapidissima at each annual growth stage, the annual growth characteristics of industrialized breeding American jackal were studied. The relationship between body length and body weight of the cultured American and Japanese wild shrews was related to the power function growth. The equations were: W = 0.8062 × 10 ~ (-5) L ~ (3.1113) (n = 122, R ~ 2 = 0.997 (N = 125, R ~ 2 = 0.997 5, P <0.01); b was close to 3, showing a constant speed Growth; both male and female fish growth can be divided into three stages: rapid growth (0 ~ + age), stable growth (1 ~ + age), growth and senescence (2 ~ + age). The equation of growth of von Bertallanffy was fit to the equation: Lt = 467.92 (1-e ~ -0.5748 (t + 0.1710)), Wt = 1637.72 (1-e -0.5748 (t + 0.1710))) ); Male: Lt = 389.21 (1-e ~ (-0.7374 (t + 0.1975))), Wt = 834.08 (1-e ~ (-0.7374 (t + 0.7189))) (3.0574). The inflection point of body weight of males and females was 1.517 8 a and 1.224 7 a, respectively, with mature inflexion points and rapid growth before inflection point. The growth rate of 2 ~ + fish decreased significantly after inflection point, especially after sexual maturity (2nd instar) , 2-year-old fish will appear after the breeding season a large number of deaths. It is advisable to commercialize commercial aquaculture production in the United States to be listed before the second birthday.