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

• Published in: Fisheries research 2000-03, Vol.45 (2), p.129-145
• Main Authors: Punt, André E., Walker, Terence I., Taylor, Bruce L., Pribac, Fred
• Format: Article
• Language: English
• Subjects: Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; Catch rates; CPUE; Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.); Fundamental and applied biological sciences. Psychology; Galeorhinus galeus; Shark; Standardization
• ISSN: 0165-7836; 1872-6763
• DOI: 10.1016/S0165-7836(99)00106-X

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 of the trends in catch rate. The data on whether or not the catch rate is zero 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 based on assuming the data are Bernoulli random variables. Given the uncertainty about the appropriate error-model to assume when fitting generalized linear models to catch and effort data, four alternative error-models — log-normal, log-gamma, Poisson, and negative binomial — were explored when modelling the non-zero catch rates.