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Responses by Pacific Halibut to Air Exposure: Lack of Correspondence among Plasma Constituents and Mortality

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https://ir.library.oregonstate.edu/concern/articles/8g84mm640

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  • Age-1 and age-2 Pacific halibut Hippoglossus stenolepis were exposed to a range of times in air (0-60 min) and air temperatures (10 degrees C or 16 degrees C) that simulated conditions on deck after capture to test for correspondence among responses in plasma constituents and mortality. Pacific halibut mortality generally did not correspond with cortisol, glucose, sodium, and potassium since the maximum observed plasma concentrations were reached after exposure to 30 min in air, while significant mortality occurred only after exposure to 40 min in air for age-1 fish and 60 min in air for age-2 fish. Predicting mortality in discarded Pacific halibut using these plasma constituents does not appear to be feasible. Lactate concentrations corresponded with mortality in age-1 fish exposed to 16 degrees C and may be useful predictors of discard mortality under a limited set of fishing conditions.
  • Keywords: discard mortality, Hippoglossus stenolepis, stress reaction
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  • Davis, M. W., & Schreck, C. B. (2005, July). Responses by Pacific halibut to air exposure: Lack of correspondence among plasma constituents and mortality. Transactions of the American Fisheries Society, 134(4), 991-998.
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  • 134
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