eCite Digital Repository

Effect of Individual Variability on the von Bertalanffy Growth Equation


Sainsbury, K, Effect of Individual Variability on the von Bertalanffy Growth Equation, Canadian Journal of Fisheries and Aquatic Sciences, 3, (2) pp. 241-247. ISSN 0706-652X (1980) [Refereed Article]

DOI: doi:10.1139/f80-031


The growth in length of a group of animals is examined. Each animal is assumed to grow according to the von Bertalanffy model with fixed parameters, but these parameters are allowed to differ between individuals. Equations governing the mean and variance of length at given age and growth increment at given length are provided, and their implications discussed. Results indicate that the traditional growth equation is likely to result in an underestimate of the mean value of K when either length at age or growth increment data are analyzed. This problem does not appear serious when using length at age data. However, the problems of interpretation are more serious in the case of growth increment data where serious overestimates of the reconstructed mean length at age can result. A thorough analysis of growth cannot be made for a population exhibiting individual variability in L and K from growth increment data alone. In particular a nonlinear relationship between growth increment and initial length does not necessarily imply that the von Bertalanffy model is inappropriate to the species in question. A topic urgently in need of examination is the form of the joint distribution of K and L in animal populations.

Item Details

Item Type:Refereed Article
Keywords:von Bertalanffy, growth models
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries sciences not elsewhere classified
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Fisheries - wild caught not elsewhere classified
UTAS Author:Sainsbury, K (Professor Keith Sainsbury)
ID Code:73254
Year Published:1980
Web of Science® Times Cited:195
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2011-09-22
Last Modified:2011-09-22

Repository Staff Only: item control page