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Am J Physiol Regul Integr Comp Physiol 278: R545-R555, 2000;
0363-6119/00 $5.00
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Vol. 278, Issue 3, R545-R555, March 2000

Effects of hypoxia, anoxia, and endogenous ethanol on thermoregulation in goldfish, Carassius auratus

Richard N. Rausch1, Larry I. Crawshaw1,2, and Helen L. Wallace1

1 Department of Biology, Organismal Section, Portland State University, Portland 97207; 2 Department of Behavioral Neuroscience and Portland Alcohol Research Center, Oregon Health Sciences University, Portland, Oregon 97201

Effects of hypoxia, anoxia, and endogenous ethanol (EtOH) on selected temperature (Tsel) and activity in goldfish were evaluated. Blood and brain EtOH concentrations ([EtOH]) and brain oxygen partial pressure (PO2) were quantified at crucial ambient oxygen pressures. Below a threshold value near 31 Torr, Tsel decreased as a function of environmental PO2. Tsel of 15°C-acclimated fish was ~10°C at the onset of anoxia and changed little over 2 h. Activity showed a similar response pattern. Brain [EtOH] was significantly elevated above control levels after 1 h anoxia. In normoxic water, Tsel remained different in previously anoxic and normoxic control fish for ~20 min. Blood [EtOH] of previously anoxic fish remained significantly elevated ([EtOH] >4.0 µmol/g blood), and activity was significantly depressed at 20 min. Brain PO2 reached normal levels in <3 min. We conclude that [EtOH] (brain or blood) and brain PO2 are not proximal causes of either behavioral anapyrexia (hypothermia) or inactivity in goldfish exposed to oxygen-depleted environments.

alcohol; temperature selection; fish; behavioral thermoregulation


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