Standardization of catch-per-unit-effort in a multi-gear multi-species fishery
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1
Management of the Rural Environment of Canarias SAU, Spain
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2
University of Las Palmas de Gran Canaria, Departamento de Matemáticas, Spain
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3
Instituto Universitario de Acuicultura Sostenible y Ecosistemas Marinos (IU-ECOAQUA), Spain
Catch-per-unit-effort (CPUE) data are commonly standardized taking into account factors that influence catch rates that are not related to resource abundance. In this work we analyze catch rates and effort data of a small-scale fishery targeting multiple species in the Canary Islands. We developed a method that combines principal component scores derived from a Principal Component Analysis (PCA) of the effort data within a Generalized Additive Model (GAM) framework. From the PCA analysis we also estimated the relative fishing power of each vessel with reference to a standard vessel for which the principal components are equal to zero, and based on the results we define two categories; the first category includes the benthic and demersal species and the second category includes the oceanic and pelagic species. The GAM model described 66.1% of the total deviance and includes seasonal variables, fishing grounds, climate index, oceanographic and biological parameters and dummies for tuna season and medium-sized coastal pelagics. The variables with the highest contribution in order of importance were the tuna dummy, the first principal component, the medium-sized coastal pelagics dummy and the fishing ground. The standardized CPUE time series showed a slight positive trend throughout the analyzed period as well as a marked seasonal component due to the tuna harvest. However, when the CPUE is analyzed according to the target groups, a negative trend is observed in the herviborous and invertebrate feeders group, reef-associated fishes, shallow-water demersals and molluscs from 2010, and the benthic cephalopods show an appreciable downward trend from 2012. We consider the approach presented here has potentially useful for stock assessment in similar multi-species fisheries.
Acknowledgements
This work was developed within the framework of the PLASMAR Project (MAC/1.1a/030), with the support of the European Union (EU) and co-financed by the European Regional Development Fund (EDRF ) and the INTERREG V-A Spain-Portugal MAC 2014-2020 (Madeira-Azores-Canarias).
Keywords:
Small-scale fishery,
GAM (generalized additive model),
PCA principal component analysis,
CPUE,
standardization,
Multi-gear fisheries,
Multi-species fisheries
Conference:
XX Iberian Symposium on Marine Biology Studies (SIEBM XX) , Braga, Portugal, 9 Sep - 12 Sep, 2019.
Presentation Type:
Poster Presentation
Topic:
Fisheries, Aquaculture and Biotechnology
Citation:
Couce
L,
Santana
A,
Bilbao-Sieyro
A,
Perez
Y and
Castro
J
(2019). Standardization of catch-per-unit-effort in a multi-gear multi-species fishery.
Front. Mar. Sci.
Conference Abstract:
XX Iberian Symposium on Marine Biology Studies (SIEBM XX) .
doi: 10.3389/conf.fmars.2019.08.00161
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Received:
02 Jun 2019;
Published Online:
27 Sep 2019.
*
Correspondence:
Dr. Lorena Couce, Management of the Rural Environment of Canarias SAU, Agüimes, Spain, lorenacm@gmrcanarias.com