Characterization and standardization of Atlantic sailfish (Istiophorus albicans) catch rates in the east Atlantic from the Portuguese pelagic longline fishery

Coelho, Rui; Lino, Pedro; Santos, Miguel

http://hdl.handle.net/10400.1/14882

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Authors

Coelho, Rui

Lino, Pedro

Santos, Miguel

Abstract(s)

This document analyzes the catch, effort and standardized CPUE trends for the eastern Atlantic stock of Atlantic sailfish (Istiophorus albicans) captured by the Portuguese pelagic longline fleet from 1999-2015. Nominal annual CPUE were calculated as kg/1000 hooks and were standardized with Generalized Linear Models (GLM) with Tweedie distribution and using year, quarter, area and targeting effects (ratios) as explanatory variables. Model goodness-of-fit was determined with AIC and the pseudo coefficient of determination, and model validation was analyzed with residual analysis. The final standardized CPUE series shows a general decrease in the initial years, between 1999 and 2010, followed by a general increase in the more recent years, until 2015, with some inter-annual oscillations. This paper presents the first index of abundance for Atlantic sailfish estimated from captures from the Portuguese pelagic longline fleet in the east Atlantic and can be used for future stock assessments of the species

URI

http://hdl.handle.net/10400.1/14882

Citation

Coelho, R., Lino, P.G., Santos, M.N. 2016. Characterization and standardization of Atlantic sailfish (Istiophorus albicans) catch rates in the east Atlantic from the Portuguese pelagic longline fishery. Sailfish stock assessment session meeting, 30 May – 03 June 2016, Miami, USA: Collect. Vol. Sci. Pap. ICCAT, 73 (5): 1764-1777.