The effects of acclimation and surface access on the resistance of fish to hypoxic stress Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9w032593w

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  • Rainbow trout (Salmo gairdneri) and bluegill (Lepomis macrochirus) were exposed to flows of water containing low DO concentrations produced by bubbling nitrogen through the water. Abrupt exposure of fish to critical DO concentrations (The standard dose response) and by a more gradual changing of DO levels (The "stepdown" approach) were employed to investigate fish reactions. The stepdown test was explored as an alternative or supplement to the standard dose response. Rainbow trout held at 15°C and bluegill at 22°C during acclimation and test periods exhibited lower LC-50s and longer median resistance times than unacclimated fish. Tests were conducted in which some fish had access to an air/water interface, some had access to a nitrogen/water interface, and some were blocked away from the surface by screens. Both species were shown to benefit from access to an air/water interface. Hematocrit values for rainbow trout showed that acclimated and unacclimated test fish produced larger numbers of red blood cells when DO concentrations were reduced. This was not the case for bluegills.
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  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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