Altered burst swimming in rainbow trout Oncorhynchus mykiss exposed to natural and synthetic oestrogens
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| Authors: | Osachoff, HL; Osachoff, KN; Wickramaratne, AE; Gunawardane, EK; Venturini, FP; Kennedy, CJ |
| Year: | 2014 |
| Journal: | Journal of Fish Biology 85: 210-227 Article Link (DOI) PubMed |
| Title: | Altered burst swimming in rainbow trout Oncorhynchus mykiss exposed to natural and synthetic oestrogens |
| Abstract: | Juvenile rainbow trout Oncorhynchus mykiss were exposed to two concentrations each of 17 beta-oestradiol (E2; natural oestrogen hormone) or 17 alpha-ethinyl oestradiol (EE2; a potent synthetic oestrogen hormone) to evaluate their potential effects on burst-swimming performance. In each of six successive burst-swimming assays, burst-swimming speed (U-burst) was lower in fish exposed to 0.5 and 1 mu g l(-1) E2 and EE2 for four days compared with control fish. A practice swim (2 days prior to exposure initiation) in control fish elevated initial U-burst values, but this training effect was not evident in the 1 mu g l(-1) EE2-exposed fish. Several potential oestrogen-mediated mechanisms for U-burst reductions were investigated, including effects on metabolic products, osmoregulation and blood oxygen-carrying capacity. Prior to burst-swimming trials, fish exposed to E2 and EE2 for 4 days had significantly reduced erythrocyte numbers and lower plasma glucose concentrations. After six repeated burst-swimming trials, plasma glucose, lactate and creatinine concentrations were not significantly different among treatment groups; however, plasma Cl- concentrations were significantly reduced in E2- and EE2-treated fish. In summary, E2 and EE2 exposure altered oxygen-carrying capacity ([erythrocytes]) and an osmoregulatory-related variable ([Cl-]), effects that may underlie reductions in burst-swimming speed, which will have implications for fish performance in the wild. (C) 2014 The Fisheries Society of the British Isles |
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