Fisheries Behavioral Ecology - Abstracts
Davis, M.W. and C.B. Schreck. 2005. Responses by Pacific halibut to air exposure: lack of
correspondence among plasma constituents and mortality. Transactions of the American Fisheries Society 134:991–998.
Abstract
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°C or 16°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°C and may be useful predictors
of discard mortality under a limited set of fishing conditions.
Last updated
26 April, 2007
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