Abstract
We have utilised a relatively new modelling method, SELECT, to calculate size-selectivity curves for data from two escape-gap field experiments on southern rock lobster ( Jasus edwardsii) in Victoria, Australia. Size-selectivity curves based on an asymmetric Richards model fitted the data better than the commonly used logistic model, possibly because of higher than expected retention of small lobsters. Theoretical size-selectivity curves, calculated from morphometric data, were remarkably close to size-selectivity curves obtained from one experiment. In a second experiment, we showed that retention probabilities for lobsters close to the legal minimum length were lower than that predicted by the theoretical size-selectivity curves. Size-selectivity curves confirm that the current escape-gap size of 60 mm is close to optimum for the legal minimum lengths used in the Victorian southern rock lobster fishery. Our analyses failed to support the common assertion that escape-gaps increase the fishing power of lobster pots.
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