Effects of nutritional status on metabolic rate, exercise and recovery in a freshwater fish |
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Authors: | Andrew James Gingerich David P Philipp Cory D Suski |
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Institution: | (1) Department of Natural Resources and Environmental Science, University of Illinois, C-519 Turner Hall (MC-047), 1102 South Goodwin Ave., Urbana, IL 61801, USA;(2) Center for Aquatic Ecology, Institute of Natural Resource Sustainability, University of Illinois, Champaign, IL 61820, USA |
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Abstract: | The influence of feeding on swimming performance and exercise recovery in fish is poorly understood. Examining swimming behavior
and physiological status following periods of feeding and fasting is important because wild fish often face periods of starvation.
In the current study, researchers force fed and fasted groups of largemouth bass (Micropterus salmoides) of similar sizes for a period of 16 days. Following this feeding and fasting period, fish were exercised for 60 s and monitored
for swimming performance and physiological recovery. Resting metabolic rates were also determined. Fasted fish lost an average
of 16 g (nearly 12%) of body mass, while force fed fish maintained body mass. Force fed fish swam 28% further and required
nearly 14 s longer to tire during exercise. However, only some physiological conditions differed between feeding groups. Resting
muscle glycogen concentrations was twofold greater in force fed fish, at rest and throughout recovery, although it decreased
in both feeding treatments following exercise. Liver mass was nearly three times greater in force fed fish, and fasted fish
had an average of 65% more cortisol throughout recovery. Similar recovery rates of most physiological responses were observed
despite force fed fish having a metabolic rate 75% greater than fasted fish. Results are discussed as they relate to largemouth
bass starvation in wild systems and how these physiological differences might be important in an evolutionary context. |
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