摘要
目前描述鱼的体重生长的方程主要有（1）和作者对该方程推广而导出的方程（2），本文对基于这两个方程的4种参数估计法，指出了其不足Z处，并提出了一种估计参数的新方法——搜寻逼近法。该方法比前4种方法具有更好的拟会化度，通过实例计算得到进一步的证实。此外，还对鱼的样本资料的处理作了论述。这对更好的掌握鱼的生长规律、进而合理利用和开发渔业资源具有重要意义。
In present, for equations describing the growth of fish, one of them is derived by von Bertalanffy, i. e. equation (1):another is equation (2) derived by author (1994)In this paper, four kinds of methods estimating, the parameters in equations (1), (2) are introduced. Meanwhile, it is pointed out that these methods have certain deficencies: either the models used are not appropriate or the assumptions made are unrealistic. Thus, in this study a new method (search and approximation method) is put forward based on equation (2) and less assumptions. To do this. R is discreted and remainder error is taken as a sca1e. Then mucli better parameters are obtained by searching and approxmating. on the basis of the measurered data of the Platyccphalus indicus, the equation of the body weight growth is derived as follows:where denothes the weight of the flathead at age i by using the kind i of methods, i = 1,2, 3,4,5. Thus, S1 = 88.13,S2 = 69.59,S3 = 78.71,S4 = 84.29,S5 = 65.46.Taking δj = (S j - S5)/S5, δ1 = 35 %, δ2 = 6%, δ3 = 20%, δ4 = 29%. obviously,the search and approximation method is advantege to the other methods.In addition, the process of the sample data correnspoding this method is also discussed much better in this paper.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1994年第5期499-504,共6页
Oceanologia Et Limnologia Sinica
基金
自选课题
关键词
鱼
生长方程
参数估计
生长规律
Fish Growth equatio Estimating parameter New method
