Standardization of catch and effort data in a spatially-structured shark fishery

The methods used to develop catch rate based indices of relative abundance for the school shark Galeorhinus galeus resource off southern Australia are outlined. These methods are based on fitting generalized linear models to catch and effort data for several regions in this fishery. This is to take account of the multi-gear nature of the fishery and the spatial structure o f the trends in catch rate. The data on whether or not the catch rate is ze ro and the catch rate given that it is non-zero are analysed separately and then combined to provide indices of abundance. The former analysis is base d on assuming the data are Bernoulli random variables. Given the uncertaint y about the appropriate error-model to assume when fitting generalized line ar models to catch and effort data, four alternative error-models - log-nor mal, log-gamma, Poisson, and negative binomial were explored when modelling the non-zero catch rates. (C) 2000 Elsevier Science B.V. All rights reserv ed.