Abstract
"Simple" fishery models as treated herein are those requiring only catch and effort data for fitting. In the models described, the yield-on-biomass curve is considered equivalent to the growth curve of the population: Schaefer, logistic; Fox, Gompertz; Pella and Tomlinson, generalized. The Fox model is more realistic for fish populations than the Schaefer, eliminating the constraint of a symmetrical yield curve. The Pella–Tomlinson model is general, including the others as special instances. Tests against data from laboratory populations of guppies support the validity of the Fox and Pella–Tomlinson models. The Fox model is the simpler to fit of the two (as it has less parameters) and has been shown to be appropriate for a number of commercial fisheries. Advantages of the models include their minimal requirements for basic data and relative ease of fitting. Limitations include lack of provision for reproductive lag and waste of biological information other than catch and effort.
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