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Catch-and-release of Atlantic cod (Gadus morhua): post-release behaviour of acoustically pretagged fish in a natural marine environment


Ferter, K and Hartmann, K and Kleiven, AR and Moland, E and Olsen, EM, Catch-and-release of Atlantic cod (Gadus morhua): post-release behaviour of acoustically pretagged fish in a natural marine environment, Canadian Journal of Fisheries and Aquatic Sciences, 72, (2) pp. 252-261. ISSN 0706-652X (2015) [Refereed Article]


Copyright Statement

Copyright 2015 the Author licensed under Creative Commons Attribution 4.0 International License (CC BY 4.0)

DOI: doi:10.1139/cjfas-2014-0290


Studying the sublethal effects of catch-and-release (C&R) is challenging, as there are several potential sources of bias. For example, if behavioural alterations immediately after the release event are to be studied, separation of tagging effects from actual C&R effects is required, which is a challenge in the wild, particularly in marine environments. To investigate the effects of C&R on Atlantic cod (Gadus morhua) in their natural environment, 80 cod were caught in fyke nets, fitted with acoustic transmitters, and released. After recovery from tagging and handling for at least 14 days, nine individuals were recaptured and released at least once during experimental angling, following best release practice. All cod survived the C&R event and did not show any large-scale behavioural changes (i.e., changes in diel vertical migrations). However, analysis of small-scale vertical movements showed that three individuals underwent short-term alterations (e.g., reduced or increased swimming activity). This study showed that pretagging fish with acoustic transmitters before experimental angling is an option when investigating fish behaviour immediately after the release event in marine environments. Moreover, release guidelines for cod should be developed, as cod can recover quickly if caught in shallow waters (<20 m) and properly handled and released.

Item Details

Item Type:Refereed Article
Keywords:recreational fishing, atlantic cod, post release survival
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries management
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Assessment and management of coastal and estuarine ecosystems
UTAS Author:Hartmann, K (Dr Klaas Hartmann)
ID Code:96801
Year Published:2015
Web of Science® Times Cited:22
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2014-11-21
Last Modified:2017-11-04
Downloads:232 View Download Statistics

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