Effects of Acute Temperature Change on Respiration and Toxicant Uptake by Rainbow Trout, Salmo gairdneri (Richardson)

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Abstract
The effects of an acute reduction in temperature (from 17° to 8° C) on respiration and the uptake of benzo[a]pyrene, 2,2′,5,5′-tetrachlorobiphenyl, and naphthalene by the gills of rainbow trout (Salmo gairdneri Richardson) were investigated with a fish metabolic chamber. As the temperature was lowered, decreased respiratory functions coupled with decreased O₂ and toxicant uptake efficiencies resulted in reduced O₂ consumption and toxicant uptake. Changes in trout respiration had no consistent effect on either O₂ or toxicant uptake efficiencies. Linear correlations were observed between O₂ and toxicant uptake eficiencies and between O₂ consumption and toxicant uptake. The reductions in O₂ and toxicant uptake are attributed to the combined effects of temperature change on gill membrane permeability and on trout O₂ demand. A framework for predicting changes in toxicant uptake on the basis of changes in O₂ consumption is proposed based on quantitative relationships observed between O₂ and toxicant uptake.

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