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2008年～2011年研究了人工养殖条件下的施氏鲟Acipenser schrenckii(♂)×达氏鳇Huso dauricus(♀)杂交后代(俗称大杂交)的生长特性。结果表明:1～7龄大杂交体长、体重相对增长率及生长指标随年龄的增长而逐渐下降,呈“异速生长-等速生长-异速生长”的变化趋势。不同年龄大杂交的体长与体重均呈幂指数关系,R2值变幅为0.95～0.99。其中,1～3龄大杂交a值>3,呈强异速生长。此后随年龄的增加,异速生长减弱,发育趋向均匀。5龄时a值为2.94接近3,7龄a值为2.63<3。大杂交肥满度随年龄增加而增大,其与体重的相关性(R2=0.94)高于与体长的相关性。采用7种生长方程对不同年龄大杂交的体长生长和体重生长进行拟合,其中Gompertz、Quadratic、VBGF和Cubic 4种生长方程式对大杂交体长生长的拟合效果较好,除Cubic生长方程外,其它6种生长方程对其体重生长的拟合度均较低。7种生长模型中,均以Cubic生长方程对大杂交的体长生长和体重生长的拟合R2值最大,RSS值最小,说明Cubic生长方程对不同年龄大杂交的生长具有最好的拟合效果,拐点体重、体长和年龄分别为28.53kg、82.11cm和4.22龄。
From 2008 to 2011, the growth characteristics of Acipenser schrenckii (♂) × Huso dauricus (♀) hybrids under artificial culture were studied. The results showed that the body length, the relative growth rate and the growth index of 1 ~ 7 years old hybrids decreased gradually with age, showing a trend of “allometric growth - isokinetic growth - allometric growth”. The body length and body weight of hybrids of different ages all showed a power exponent, and the R2 value ranged from 0.95 to 0.99. Among them, a-3-year-old hybrid a value> 3, showed a strong all-time growth. Since then with increasing age, allometric growth weakened, the development trend of uniform. The 5-year-old a value of 2.94 close to 3,7-year-old a value of 2.63 <3. The crosshardenness increased with age and its correlation with body weight (R2 = 0.94) was higher than that with body length. Seven growth equations were used to fit body length growth and body weight growth of different age hybrids. The growth curves of Gompertz, Quadratic, VBGF and Cubic were fitted well to the growth curve of large hybrids except for the Cubic growth equation In addition, the other six kinds of growth equation for their body weight growth were lower. Among the seven growth models, the Cubic growth equation was the best for fitting the R2 value of body length growth and body weight growth, and the RSS value was the smallest, which indicated that Cubic growth equation had the best fitting effect on the growth of different age hybrids , Inflection point weight, body length and age were 28.53kg, 82.11cm and 4.22 respectively.