A review of the fish feeding model MAXIMS

A review of the ICLARM fish feeding model MAXIMS is presented, including a literature review of previous publications using the model. This model calculates feeding period, ingestion and evacuation rates and daily ration from sets of 24-h stomach content field data without the need for laboratory studies to determine any of these parameters. The best fit to the data is determined by means of a lowest sum of squared residuals (SSR) approach. The model has four main routines, giving the option of either one (Model 1) or two (Model 2) feeding periods and ingestion rates that are either constant (Models 1.1 and 2.1) or inversely dependent on the level of stomach fullness (Models 1.2 and 2.2). When both the constant and inversely dependent model are fitted to the same data set, nearly the same fit and a slightly lower SSR value is obtained using the latter model; the mathematical reasons for and statistical significance of this phenomenon are discussed. The authors attempt to give biological guidelines on the choice of model for different fish species depending on feeding type and environmental circumstances, as well as a mathematical way to test the goodness of fit of the Models 1.1/2.1 curves against that of the Models 1.2/2.2 curves so that these biological consideration may gain statistical support. An improved version using the software package SAS for Windows is also presented, calculating confidence limits for the various parameters so that curves for different data sets may be compared against each other.