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Wednesday, January 31 • 8:20am - 8:40am
FISH PHYSIOLOGY & BEHAVIOR: Temperature Effects on Bluegill Sunfish and Largemouth Bass Metabolism

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AUTHORS. Israt Jahan, Robert Colombo, Anabela Maia - Eastern Illinois University

ABSTRACT. Fish have evolved physiologically to live within a specific range of environmental variation and existence outside of that range can be stressful or fatal. There is already evidence of loss of warm water fish habitat in the Midwest, due to an increase in temperature in local streams. To protect fish populations from climate change we need more information on how temperature affects physiological processes to improve management policies. This study investigates physiological processes impaired by thermal tolerance, specifically how changes in water temperature affect the metabolic cost of swimming in largemouth bass (Micropterussalmoides) and bluegill sunfish (Lepomis macrochirus). Fish were housed at 20°C and then tested in a recirculating flow tank 2 body lengths (BL)/s at 20°C, 25°C and 16°C, while recording decreasing concentrations in oxygen due to respiration. Mass corrected oxygen consumption (MO2) was different between fish swum at different temperatures. At the lower temperature (16°C), fish had lower metabolic rates in both species as expected. ANOVA also showed that MO2 was dependent on species. Active metabolic rates were 1.2 (in 20°C) and 1.3 (in 16°C) times higher in largemouth bass than in bluegill sunfish. The Q10 calculated at 2 BL/s was 1.43 for bluegill sunfish and 1.57 for largemouth bass which is less than the normal Q10 reported for percoid fish of 1.98. With increased temperature, the higher metabolic allocated to locomotion may affect the capacity of these species to allocate resources to growth and reproduction. Freshwater fish species that have higher site fidelity, e.g. bluegill sunfish, might have more problems seeking optimal habitats as temperature increases. However, largemouth bass, which has higher metabolic rates, might be more susceptible to stunted growth. Insight into physiological processes at the individual level will contribute to stronger community wide conservation efforts of these recreational species.

Wednesday January 31, 2018 8:20am - 8:40am CST