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- Title
Fish growth, physiological stress, and tissue condition in response to rate of temperature change during cool or warm diel thermal cycles.
- Authors
Eldridge, William H.; Sweeney, Bernard W.; Law, J. Mac
- Abstract
The effect of the rate of temperature change on fish was studied by exposing a variety of North American fish species to diel temperature cycles containing rates of change of 0.8, 1.1, 2.2, or 4.4 °C·h−1. During a simulated cool season (3.9-11.7 °C), bluntnose minnow ( Pimephales notatus), spotfin shiner ( Cyprinella spiloptera), and white sucker ( Catostomus commersonii), but not smallmouth bass ( Micropterus dolomieu), gained mass in response to 0.8, 1.1, or 2.2 °C·h−1 but not constant mean temperature. White sucker did not grow under 4.4 °C·h−1, which was slower than expected based upon bioenergetics models. Physiological indicators of acute stress (day 1 cortisol), chronic stress (day 44 cortisol and triglycerides), and histomorphological measures suggested no effect of treatment. During a simulated warm season (20.0-27.8 °C), growth by channel catfish ( Ictalurus punctatus), rosyside dace ( Clinostomus funduloides), smallmouth bass, and spotfin shiner was not altered by any rate of temperature change; however, walleye ( Sander vitreus) and white sucker grew slower than expected under 4.4 °C·h−1. Physiological indicators of acute stress (day 1 cortisol), chronic stress (day 29 cortisol and triglycerides), and histomorphological measures suggested no effect of treatment. Chronic exposure to temperature change of 4.4 °C·h−1 may not induce an acute or chronic stress response but may slightly impair growth for some species.
- Subjects
FISH growth; PHYSIOLOGICAL stress; EFFECT of temperature on fishes; FISH speciation; BLUNTNOSE minnow; WHITE sucker; CHANNEL catfish; FISHES
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2015, Vol 72, Issue 10, p1527
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/cjfas-2014-0350