Estimating post-release mortality of European sea bass based on experimental angling

Lewin, Wolf-Christian, Strehlow, Harry Vincent, Ferter, Keno, Hyder, Kieran ORCID:, Niemax, Jan, Herrmann, Jens-Peter and Weltersbach, Marc Simon (2018) Estimating post-release mortality of European sea bass based on experimental angling. ICES Journal of Marine Science, 75 (4). pp. 1483-1495. ISSN 1054-3139

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European sea bass (Dicentrarchus labrax) is an important target species for recreational and commercial fisheries. In recent years, the spawning stock biomass has declined markedly in some areas, and strict management measures have been introduced. However, the development of appropriate stock assessment and fisheries management has been hampered by a lack of information on post-release mortality. This study investigated post-release mortality of sea bass captured with common recreational fishing gear under experimental conditions in an aquaculture facility over 10 d. Three experiments investigated: (i) the effects of different bait types; (ii) the impact of prolonged air exposure; and (iii) the impact of deep hooking on post-release mortality. By combining the experimental results with country-specific information on sea bass angling practices, estimates of post-release mortality are provided for the northern sea bass stock. No mortality was observed for sea bass captured on artificial baits. The use of natural baits resulted in a mortality of 13.9% (95% CI = 4.7-29.5%), which was associated with deep hooking, hooking injuries, and prolonged air exposure. The use of artificial baits and short air exposure (°30 s) increased survival probability, whereas deep hooking resulted in 76.5% (95% CI 50.0-93.2%) mortality. Depending on country-specific angling practices, post-release mortality estimates ranged from 2.8% to 9.1% (mean 5.0%, 95% CI 1.7-14.4%) for northern sea bass. Despite these relatively low mortality estimates, post-release mortality should be considered in stock assessments as its cumulative impact may be high. Moreover, post-release mortality can be reduced by implementing species-specific best practice guidelines.

Item Type: Article
Additional Information: Funding Information: The authors are grateful to the staff of the Institute for Hydrobiology and Fisheries Science of the University of Hamburg for their support and provision of equipment. In particular, the authors would like to thank Steffen Funk and Richard Klinger for practical support during the experiments. Furthermore, the authors wish to thank Martin de Graaf, Tessa van der Hammen, Thomas Verleye, Frankwin van Winsen, and Manuel Bellanger for providing country-specific information on sea bass angling practices. The collection of this information was facilitated by the ICES Working Group on Recreational Fisheries Surveys (WGRFS). Annemarie Schütz helped with graphic design of the figures. This study has been co-funded by the European Commission’s Data Collection Framework (DCF). M.S.W and H.V.S were co-funded by DCF. K.F. has been funded by the projects “Effekter av fang-og-slipp” and “Kartlegging av turistfiske” through the Coastal Zone Ecosystem Program at the Institute of Marine Research. K.H. was supported by Defra contract MI001 (Management of Recreational Marine Fisheries). Publisher Copyright: © International Council for the Exploration of the Sea 2018. All rights reserved.
Uncontrolled Keywords: catch-and-release,deep hooking,dicentrarchus labrax,discard mortality,hook and line fishing,hooking injuries,recreational fisheries,reflex and condition indicators,stock assessment,oceanography,ecology, evolution, behavior and systematics,aquatic science,ecology,sdg 14 - life below water ,/dk/atira/pure/subjectarea/asjc/1900/1910
UEA Research Groups: Faculty of Science > Research Centres > Centre for Social and Economic Research on the Global Environment (CSERGE)
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Depositing User: LivePure Connector
Date Deposited: 25 Nov 2023 03:23
Last Modified: 27 Nov 2023 03:08
DOI: 10.1093/icesjms/fsx240

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