企鹅珍珠贝早期养殖生长性状的增长规律及生长曲线拟合研究

Study on development rules and growth curve fitting of early cultured winged pearl oyster (Pteria penguin)

  • 摘要: 该研究对海南新村港养殖17个月的企鹅珍珠贝(Pteria penguin)苗种生长性状进行测量,利用von Bertalanffy、Gompertz和Logistic 3种生长模型对其生长性状的增长规律进行拟合,通过Levenberg-Marquardt迭代法求出各模型中3个生长参数,综合各参数的最优值,得出不同生长性状拟合效果最佳的生长模型。结果表明,Gompertz模型为企鹅珍珠贝各生长性状的最优生长模型。根据生长参数得出壳长、壳高、壳宽和体质量的生长极限值分别为93.519 mm、90.641 mm、39.075 mm和157.755 g,生长拐点分别为2.86个月、4.04个月、5.63个月和9.61个月;各生长性状间的绝对生长速度在不同生长期内差异较大,但随着月龄的增大均呈现先增加后降低的趋势;性状间相对生长速度存在差异并随月龄的增长逐渐趋于0。研究结果可为企鹅珍珠贝的养殖生态研究、遗传育种及插核育珠提供理论依据和参考资料。

     

    Abstract: We measured the growth traits of cultured Pteria penguin in Xincun Port for 17 months and selected three growth models of Logistic, von Bertalanffy and Gompertz for fitting the growth model of growth traits in P. penguin to establish the optimum growth equation of growth traits. Growth parameters in each growth model were estimated by Levenberg-Marquardt iteration method. The results indicate that Gompertz model was the optimal growth model for growth curves of growth traits. The growth limits of shell length, shell height, shell width and total weight of P. penguin were 93.519 mm, 90.641 mm, 39.075 mm and 157.755 g, respectively. The growth inflection points of the growth traits were 2.86 months for shell length, 4.04 months for shell height, 5.63 months for shell width and 9.61 months for total weight. The absolute growth rate of growth traits varied in different growth periods, which increased firstly and then decreased with increase of months. The relative growth rates were different among the four growth traits and gradually tended to 0. The results provide references for prediction of future change in culture ecology, selection breeding and pearl production of P. penguin.

     

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