Mortality impact of recreational angling techniques and hook types on Trachynotus ovatus (Linnaeus, 1758) following catch-and-release |
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| Authors: | Josep Alós |
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| Affiliation: | 1. NSW Department of Primary Industries, Fisheries Conservation Technology Unit, PO Box 4321, National Marine Science Centre, Coffs Harbour, NSW 2450, Australia;2. Sterling Trawl Gear Services, 187 Ernest Street, Manly, QLD 4179, Australia;3. Department of Statistics, The University of Auckland, Private Bag 92019, Auckland, New Zealand;1. School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand;2. Department of Human Dimensions of Natural Resources, Colorado State University, Fort Collins, CO, USA;3. School of Psychology, Victoria University of Wellington, New Zealand;1. Fish Ecology and Conservation Physiology Laboratory, Ottawa-Carleton Institute for Biology, Carleton University, 1125 Colonel By Dr., Ottawa, ON K1S 5B6, Canada;2. Department of Environmental Conservation, University of Massachusetts Amherst, 160 Holdsworth Way, Amherst, MA 01003 USA;1. Department of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany;2. Division of Integrative Fisheries Management, Faculty of Life Sciences & Integrative Research Institute for the Transformation of Human-Environment Systems (IRI THESys), Humboldt-Universität zu Berlin, Invalidenstrasse 42, 10115 Berlin, Germany;3. Instituto Mediterráneo de Estudios Avanzados, IMEDEA (CSIC-UIB), C/Miquel Marqués 21, 07190, Esporles, Illes Balears, Spain;4. Angling Association of Lower Saxony (Anglerverband Niedersachsen e.V.), Bürgermeister-Stümpel-Weg 1, 30457 Hannover, Germany |
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| Abstract: | We evaluated the post-release mortality (PRM) following catch-and-release in Trachynotus ovatus, one of the main target species of north-western Mediterranean recreational fisheries. In this study, we observed the line-caught fish for 10 d in a holding tank in order to investigate the independence and impact on mortality of several explanatory variables, including fish size, surface temperature, anatomical hooking location, bleeding, hook type, and line cutting. We observed a total PRM of 24.1% and the most important mortality factor by far was the anatomical position of the hook. Anatomically deeper hooking events were highly correlated with fish size and the presence of blood during hooking injuries. The PRM obtained in this study was higher than values reported in previous studies of this species, mainly because we considered the effects of passive angling techniques. Passive angling increased the incidence of deep hooking and consequently increased mortality compared to active angling. This technique also led to an increase in deep hooking by circle hooks. Therefore, we recommend that active angling techniques be encouraged and we emphasize the need for education on the correct use of circle hooks. This study provides guidelines to managers, scientists, and anglers that will promote sustainable development of the recreational fisheries of the Mediterranean. |
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