Effects of gas-supersaturated water on Rana catesbeiana tadpoles |
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| Authors: | John Colt Kris Orwicz Dale Brooks |
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| Institution: | 1. Teufel and Associates, 1303 Lake Boulevard, Davis, CA 95616 U.S.A.;2. Department of Mechanical Engineering, University of California, Davis, CA 95616 U.S.A.;3. Animal Resources Service, School of Veterinary Medicine, University of California, Davis, CA 95616 U.S.A. |
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| Abstract: | Rana catesbeiana tadpoles were exposed to gas supersaturated water which resulted in inflation of the gastrointestinal tract with gas. Affected tadpoles floated on the surface, either with their left sides elevated or on their backs. These clinical signs, similar to those of gas bubble disease, could be reversed by reducing the dissolved gas levels. Based on post-exposure observation for 30 days, a 4-day exposure to a ΔP of 160 to 170 mm Hg had no effect on survival. A 10-day exposure increased mortality and the levels of systemic Aeromonas hydrophila bacteria, the etiology of a serious amphibian disease, “Redleg”. Bacterial levels returned to control levels after a 6-day recovery period. |
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