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Assessing pinniped bycatch mortality with uncertainty in abundance and post-release mortality : a case study from Chile

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Date
03/2021
Author
Punt, André E.
Sepúlveda, Maritza
Siple, Margaret C.
Moore, Jeff Rey
Francis, Tessa B.
Hammond, Philip S.
Heinemann, Dennis
Long, Kristy J.
Oliva, Doris
Reeves, Randall R.
Sigurðsson, Guðjón Már
Víkingsson, Gísli
Wade, Paul R.
Williams, Rob
Zerbini, Alexandre N.
Keywords
Bayesian methods
Bycatch
Marine mammals
Precautionary management
Stock assessment
GC Oceanography
QA Mathematics
SH Aquaculture. Fisheries. Angling
Aquatic Science
3rd-DAS
SDG 3 - Good Health and Well-being
SDG 14 - Life Below Water
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Abstract
The effects of human-caused mortality, such as fisheries bycatch, of endangered, threatened and protected (ETP) species of marine mammals can be evaluated using population model-based stock assessments. The information available to conduct such assessments is often very limited. Available data might include fragmented time-series of abundance estimates, incomplete data on bycatch for the fisheries that interact with ETP species (often few years and low observer coverage), and perhaps some data on scale and trends in fishing effort. Such data are challenging to use as the basis for stock assessments, which generally assume that estimates of removals (bycatch, in our context) through time are available for at least the most recent decade or two. This paper describes a stock assessment method for use with sparse observer data on bycatch mortality, applied within the context of a Bayesian estimation framework. The method produces estimates, with associated measures of precision, of population size and historical time-series of bycatch mortality that are consistent with the observer and abundance data. It provides a rigorous way to account for the uncertainty arising from animals that are caught but released alive and then die subsequent to release, given a post-release mortality rate prior. Observer data from industrial and artisanal purse seine and trawl fisheries and survey data for South American sea lions (Otaria byronia) and South American fur seals (Arctocephalus australis) off Chile are used to illustrate the method.
Citation
Punt , A E , Sepúlveda , M , Siple , M C , Moore , J R , Francis , T B , Hammond , P S , Heinemann , D , Long , K J , Oliva , D , Reeves , R R , Sigurðsson , G M , Víkingsson , G , Wade , P R , Williams , R & Zerbini , A N 2021 , ' Assessing pinniped bycatch mortality with uncertainty in abundance and post-release mortality : a case study from Chile ' , Fisheries Research , vol. 235 , 105816 . https://doi.org/10.1016/j.fishres.2020.105816
Publication
Fisheries Research
Status
Peer reviewed
DOI
https://doi.org/10.1016/j.fishres.2020.105816
ISSN
0165-7836
Type
Journal article
Rights
Copyright © 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.
Description
We acknowledge funding from LENFEST and Project FIPA.
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/21164

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

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