FAR 2017/12 Recalculation of historical landings of porbeagle shark.

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FAR-2017-12-Porbeagle-shark-historical-landings.pdf

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FAR-2017-12-Porbeagle-shark-historical-landings.pdf (895.3 kb)

Abstract
Historical conversion factors (CFs) applied to shark fin processed weights to determine landed whole weights have sometimes been inappropriate, leading to biased estimates of fishing mortality. A new time series of New Zealand annual porbeagle shark mortality was derived using appropriate CFs and an allowance for mortality of discards and released live sharks. The revised time series resulted in 6% more mortality by weight overall for 1998−2016, with annual values varying by –22% to +42%.

Document date
Friday, 17 March 2017

Document type
V 1.3

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Adobe PDF

File size
895.3 kb

Reference number
2017/12

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FAR-2017-12-Porbeagle-shark-historical-landings.pdf

Uploaded date
Friday, 17 March 2017

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FAR: 2017/12;
ISSN: 1179-5352;
ISBN: 978-1-77665-514-4;
ScienceStock: Highly migratory species;
Species: porbeagle;
ResearchField: fishing mortality; Historical conversion factors; historical landings; porbeagle shark; processed weights; shark mortality; time series;
Author: Francis;

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