Linking environmental factors with reflex action mortality predictors, physiological stress, and post-release movement behaviour to evaluate the response of white sturgeon (Acipenser transmontanus Richardson, 1836) to catch-and-release angling.

Autor: McLean MF; Evolutionary Physiology and Animal Ecology Laboratory, Department of Biology, Dalhousie University, Halifax, Nova Scotia B3H 1J8, Canada. Electronic address: montana.mclean@dal.ca., Litvak MK; Fish Ecology and Aquaculture Laboratory, Department of Biology, Mount Allison University, Sackville, New Brunswick E4L 1E4, Canada., Stoddard EM; Resource Management Division, South Coast, B.C. Ministry of Forests, Lands, Natural Resource Operations and Rural Development, Surrey, British Columbia V3R 1E1, Canada., Cooke SJ; Fish Ecology and Conservation Physiology Laboratory, Department of Biology and Institute of Environmental and Interdisciplinary Sciences, Carleton University, Ottawa, Ontario K1S 5B6, Canada., Patterson DA; Fisheries and Oceans Canada, Cooperative Resource Management Institute, School of Resource and Environmental Management, Simon Fraser University, Vancouver, British Columbia V5A 1S6, Canada., Hinch SG; Pacific Salmon Ecology and Conservation Laboratory, Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, British Columbia V6T 1Z4, Canada., Welch DW; Kintama Research Services Ltd., 4737 Vista View Cr., Nanaimo, British Columbia V9V 1N8, Canada., Crossin GT; Evolutionary Physiology and Animal Ecology Laboratory, Department of Biology, Dalhousie University, Halifax, Nova Scotia B3H 1J8, Canada.
Jazyk: angličtina
Zdroj: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology [Comp Biochem Physiol A Mol Integr Physiol] 2020 Feb; Vol. 240, pp. 110618. Date of Electronic Publication: 2019 Nov 12.
DOI: 10.1016/j.cbpa.2019.110618
Abstrakt: White sturgeon are the largest freshwater fish in North America and are the focus of an intense catch-and-release (C&R) fishery; the effects are largely unknown. We assessed the effect of fight and handling time, water temperature, river discharge rate, and fish size on physiological and reflex impairment responses of wild white sturgeon to angling. Sixty of these fish were tagged with acoustic transmitters to assess survival and post-release behaviour. Survival was high (100%). Water temperature and discharge influenced post-capture blood physiology. Specifically, lactate, chloride, and cortisol concentrations were elevated in individuals fought longer, and captured at higher water temperatures and river discharge. Cortisol was affected by fish size, with lower concentrations found in larger individuals. Only lactate and chloride were positively related to reflex impairment scores. Post-release movements were correlated with physiological state, fight characteristics and the environment. Specifically, higher blood lactate and chloride and those with longer fight times moved shorter distances after release. Contrastingly, higher levels of circulating glucose and potassium, as well as larger fish captured during periods of high discharge moved longer distances. Sturgeon tended to move shorter distances and at slower rates when reflex impairment was high, although reflex impairment in general did not explain a significant proportion of the variance in any movement metric. Our results show intriguing variance in the physiological and behavioural response of individual white sturgeon to C&R angling, with some degree of environmental dependence, and highlights the importance of understanding drivers of such variation when managing fisheries.
(Copyright © 2019 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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