Biomass Dynamic Models

Abstract

Biomass dynamic models share most data requirements and assumptions with production models, however, they do not assume stocks are in equilibrium. They try to explain changes in an abundance index (normally CPUE) as a function of the removal of biomass by fishing, the biomass in the previous time period and the growth in biomass. Biomass dynamic models are very simple representations of the dynamics of fish stocks. A brief outline is given of some of the rules which should be remembered when using these models.