Temperature affects activity and feeding motivation in Pacific halibut: Implications for bait-dependent fishing |
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| Institution: | 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, Humboldt-Universität zu Berlin, Invalidenstrasse 42, 10115, Berlin, Germany;3. Thünen Institute of Baltic Sea Fisheries, Alter Hafen Süd 2, 18069, Rostock, Germany;4. General and Specific Zoology, Institute of Biological Sciences, University of Rostock, Rostock, Germany;5. Mecklenburg‐Vorpommern Research Centre for Agriculture and Fisheries, Institute of Fisheries, Fischerweg 408, 18069, Rostock, Germany;1. Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental and Interdisciplinary Science, Carleton University, Ottawa, ON, K1S 5B6, Canada;2. Department of Environmental Conservation, University of Massachusetts Amherst, 160 Holdsworth Way, Amherst, MA 01003-9485, USA;1. Departamento de Pesca e Aquicultura, Universidade Federal Rural de Pernambuco, Recife, 52171-030, PE, Brazil;2. Marine and Environmental Sciences Center, Polytechnic of Leiria, Peniche, 2520-630, Portugal;3. Instituto do Mar, Universidade Federal de São Paulo, Santos, 11070-100, SP, Brazil;4. Departamento de Ciências Animais, Universidade Federal Rural do Semi Árido, Mossoró, 59625-900, RN, Brazil;1. Decapod Crustacean Laboratory, Federal University of Rio Grande, Av. Itália, km 8, Rio Grande, Brazil;2. NSW Department of Primary Industries, Fisheries Conservation Technology Unit, NSW DPI, National Marine Science Centre, PO Box 4321, Coffs Harbour, NSW 2450, Australia;3. Marine and Estuarine Ecology Unit, School of Biological Sciences, University of Queensland, Brisbane, QLD 4072, Australia;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: | Laboratory experiments were conducted to test the hypothesis that temperature (2–10 °C) and recent feeding history (1–14 days food deprivation) influence the activity and feeding motivation of Pacific halibut (Hippoglossus stenolepis). Activity was examined before and after presentation of a chemical cue prepared from squid (Loligo opalescens). Spontaneous activity in 2 °C was essentially zero and increased with temperature. Searching behavior increased with cue introduction in all treatments and search intensity was closely correlated with temperature. Food deprivation did not significantly affect either pre- or post-cue activity. The number of baits located, attacked and consumed increased with temperature, and the times required to accomplish those behaviors decreased significantly with temperature. In most cases, very slow responses occurred at 2 °C, differences between 4 and 6 °C were small and not significant, and times were shortest in 10 °C. Temperature did not have a significant effect on latency in attack or bait handling time, and feeding history had no significant effects on any of the timed measures. These results indicate a large potential impact of temperature on Pacific halibut catchability in longline surveys. Stock size could be significantly underestimated in a cold season or cold year and in deep water environments where temperatures are low. |
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