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Chill out: physiological responses to winter ice-angling in two temperate freshwater fishes

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Chill out; physiological responses to winter ice-angling in two temperate freshwater fishes.pdf (425.5Kb)

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Author

Louison, Michael J.
Hasler, Caleb T.
Raby, Graham D.
Suski, Cory D.
Stein, Jeffrey A.

Uri

http://hdl.handle.net/10680/1808

Date

2017-04-17

Doi

10.1093/conphys/cox027

Citation

Louison, Michael J., Caleb T. Hasler, Graham D. Raby, Cory D. Suski, and Jeffrey A. Stein. "Chill out: physiological responses to winter ice-angling in two temperate freshwater fishes." Conservation Physiology 5 (2017): cox027. DOI: https://doi.org/10.1093/conphys/cox027.

Abstract

A large body of research has documented the stress response of fish following angling capture. Nearly all of these studies have taken place during the open-water season, with almost no work focused on the effects of capture in the winter via ice angling. We therefore conducted a study to examine physiological disturbance and reflex impairment following capture by ice-angling in two commonly targeted species, bluegill Lepomis macrochirus and yellow perch Perca flavescens. Fish were captured from a lake in eastern Wisconsin (USA) and sampled either immediately or after being held in tanks for 0.5, 2 or 4 h. Sampling involved the assessment of reflex action mortality predictors (RAMP) and a blood biopsy that was used to measure concentrations of plasma cortisol and lactate. The capture-induced increase in plasma cortisol concentration was delayed relative to responses documented in previous experiments conducted in the summer and reached a relative high point at 4 h post-capture. Reflex impairment was highest at the first post-capture time point (0.5 h) and declined with each successive sampling (2 and 4 h) during recovery. Bluegill showed a higher magnitude stress response than yellow perch in terms of plasma cortisol and RAMP scores, but not when comparing plasma lactate. Overall, these data show that ice-angling induces a comparatively mild stress response relative to that found in previous studies of angled fish. While recovery of plasma stress indicators does not occur within 4 h, declining RAMP scores demonstrate that ice-angled bluegill and yellow perch do recover vitality following capture.

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