Journal Article

Bayesian estimation of fish school cluster composition applied to a Bering Sea acoustic survey

T. R. Hammond, G. L. Swartzman and T. S. Richardson

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 58, issue 6, pages 1133-1149
Published in print January 2001 | ISSN: 1054-3139
Published online January 2001 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1006/jmsc.2001.1103
Bayesian estimation of fish school cluster composition applied to a Bering Sea acoustic survey

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This paper applies BASCET, a Bayesian Spatial Composition Estimation Tool for clusters of acoustically identified schools, to Bering Sea acoustic survey data collected during 1994. As the method employs prior information from an acoustic expert, procedures for eliciting such information are suggested and pitfalls of the process are indicated. Techniques for model checking using the posterior predictive distribution are employed, as is a multi-chain method for evaluating the convergence of the Markov-Chain Monte Carlo algorithm used in BASCET. Unlike methods based on neural networks, BASCET is able to provide confidence regions for its estimates of school cluster composition. In addition, it can indicate which school cluster attributes were most influential in determining a given estimate, a useful tool for model checking that is here demonstrated on a randomly selected cluster. Estimated abundance ratios of juvenile to adult pollock (Theragra chalcogramma) were compared, in two regions, to the values used by expert technicians. Ratios differed from expert values by less than 0.03 in both regions. The encouraging results reported here suggest that the BASCET method, originally tested on simulated data, may be usefully applied to real surveys.

Keywords: acoustic survey; Bayesian; prior elicitation; species discrimination

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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