Scientia Marina, Vol 84, No 1 (2020)

A multivariate statistical analysis to determine catch intention in the pink cusk-eel (Genypterus blacodes) longline fishery in southern Chile


https://doi.org/10.3989/scimar.04953.30A

Rodrigo Wiff
Centre of Applied Ecology and Sustainability, Pontificia Universidad Católica de Chile, Chile
orcid https://orcid.org/0000-0001-7330-4206

Guillermo Martin Gonzalez
Marine Institute, Ireland
orcid https://orcid.org/0000-0002-1984-6140

Francisco Contreras
División de Investigación Pesquera, Instituto de Fomento Pesquero (IFOP), Chile
orcid https://orcid.org/0000-0003-3062-5477

Marcelo A. San Martín
División de Investigación Pesquera, Instituto de Fomento Pesquero (IFOP), Chile
orcid https://orcid.org/0000-0003-4284-6322

T. Mariella Canales
Centre of Applied Ecology and Sustainability, Pontificia Universidad Católica de Chile, Chile
orcid https://orcid.org/0000-0003-3238-5825

Abstract


The definition of catch intention in multispecies fisheries is a key step toward building abundance indexes based on commercial fishing data. Previous analysis to determine catch intention in the pink cusk-eel (Genypterus blacodes) has been based on the idea that fishing tactics remain constant over time (static fishing tactics). We propose a statistical procedure to determine the catch intention of each haul in the industrial longline fisheries in southern Chile, where fishing tactics may vary over time. This procedure is based on principal component analysis and agglomerative hierarchical analysis of the catch composition, and relaxes the assumption of static fishing tactics by selecting a subset of data that is informative for fishing intention (target versus by-catch) every year. Sensitivity analyses were conducted to assess the robustness of variable fishing tactics on the nominal catch rates in pink cusk-eel. Targeted and by-catch time series of nominal catch rates showed a different trend, so determining the catch intention became relevant. Sensitivity analyses showed that trends in targeted catch rates are robust to the variations of fishing tactic per year. We recommend the use of variable fishing tactics for further use in effort standardization and stock assessment of the pink cusk-eel fishery in southern Chile.

Keywords


by-catch; CPUE; catch intention; catch composition; fishing tactics; multivariate analysis

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