Standardized CPUE and size distribution of the shortfin mako shark in the portuguese pelagic longline fishery in the Atlantic

Coelho, Rui; Rosa, Daniela; Lino, Pedro

http://hdl.handle.net/10400.1/12613

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Authors

Coelho, Rui

Rosa, Daniela

Lino, Pedro

Abstract(s)

This document provides fishery indicators for the shortfin mako shark captured by the Portuguese pelagic longline fishery in the Atlantic (standardized CPUEs and size distribution). The analysis was based on data collected from fishery observers, port sampling and skippers logbooks (self sampling), between 1995 and 2015. The mean sizes were compared between years, seasons (quarters), stocks (north and south) and sampling areas. The CPUEs were analyzed for the North Atlantic and compared between years, and were standardized with Tweedie and Delta GLM approaches. In general, there was a large variability in the nominal CPUE trends in the North Atlantic, and the final standardized series was flatter than the nominal. For the size distribution there were no major trends in the time series, with the sizes tending to be larger in the South Atlantic. The data presented in this document can be considered for use in the upcoming 2017 shortfin mako stock assessment, specifically the standardized CPUE for the North Atlantic and the size distribution for both hemispheres.

Keywords

Bycatch Fishery indicators Nominal CPUE Pelagic longline fishery Sharks Size distribution

URI

http://hdl.handle.net/10400.1/12613

Citation

Coelho, R., Rosa, D., Lino, P. G., 2017. Standardized CPUE and size distribution of the shortfin mako shark in the portuguese pelagic longline fishery in the Atlantic. Collect. Vol. Sci. Pap. ICCAT, 74(4): 1579-1600