ESTIMATION OF GILLNET AND HOOK SELECTIVITY USING LOG-LINEAR MODELS

The log-linear modelling capabilities of existing statistical software permit a generalization of Holt's indirect estimation method by allow ing several different selection curve models to be fitted to catch dat a from an arbitrary number of mesh sizes. This also facilitates the us e of formal inferential procedures such as model selection, assessment of relative fishing powers, estimation of standard errors, and permit s inclusion of knowledge regarding the shape of the population length distribution. This methodology is equally applicable to estimation of hook selectivity. (C) 1997 International Council for the Exploration o f the Sea.