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A Multivariate Poisson Approach to Estimating Target Catch and Bycatch Production

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  • This paper develops a count data model of target species and bycatch production for an arbitrary number of species that handles correlation between species and over time. The model is applied to a large observer dataset for fishing trips taken from 1990 to 2008 for roughly 150 vessels participating in the California/ Oregon drift gillnet fishery. The fishery targets swordfish and thresher shark and produces leatherback turtle and marine mammal bycatch. Bycatch in commercial fisheries is an unwanted output which is commonly regulated by conservation measures such as quotas or time-and-area closures that directly impact the status and production of the associated fishery. Set level production is modeled within a multiproduct production system framework as conditionally dependent on temporal, spatial, technological, environmental, and regulatory explanatory variables. The model is empirically estimated utilizing the multivariate compound Poisson estimator with set level data to estimate the impact of explanatory variables on the rates of target species and bycatch production within the fishery. Empirical results suggest a statistically significant relationship between set and vessel level characteristics and production rates of target species and bycatch. The rare-event risk for protected species bycatch indicates that conservation measures to further reduce bycatch from current rates may have a statistically significant opportunity cost of target species production.
  • KEYWORDS: Fisheries economics, Fishery management, Bycatch, Discard, Selectivity
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  • Hilger, James and Stephen Stohs. 2010. A Multivariate Poisson Approach to Estimating Target Catch and Bycatch Production. In: Proceedings of the Fifteenth Biennial Conference of the International Institute of Fisheries Economics & Trade, July 13-16, 2010, Montpellier, France: Economics of Fish Resources and Aquatic Ecosystems: Balancing Uses, Balancing Costs. Compiled by Ann L. Shriver. International Institute of Fisheries Economics & Trade, Corvallis, Oregon, USA, 2010.
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  • US National Oceanic and Atmospheric Administration (NOAA) Fisheries Division, Agence Française de Développement, Ministère de l’Enseignement Supérieur et de la Recherche, Ministère de L’Alimentation de L’Agriculture et de la Pêche, Ministère de l’Énergie, du Développement Durable et de la Mer, La Région Languedoc Rouslilon, Département Hérault, Montpellier Agglomèration, The Department of Fisheries and Oceans, Canada, and AquaFish Collaborative Research Support Program (CRSP).
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