title: Effects of hypoxia, anoxia, and endogenous ethanol on thermoregulation in goldfish, Carassius auratus.
abstract: Effects of hypoxia, anoxia, and endogenous ethanol (EtOH) on selected temperature (T(sel)) and activity in goldfish were evaluated. Blood and brain EtOH concentrations ([EtOH]) and brain oxygen partial pressure (PO(2)) were quantified at crucial ambient oxygen pressures. Below a threshold value near 31 Torr, T(sel) decreased as a function of environmental PO(2). T(sel) of 15 degrees C-acclimated fish was approximately 10 degrees 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, T(sel) remained different in previously anoxic and normoxic control fish for approximately 20 min. Blood [EtOH] of previously anoxic fish remained significantly elevated ([EtOH] >4.0 micromol/g blood), and activity was significantly depressed at 20 min. Brain PO(2) reached normal levels in <3 min. We conclude that [EtOH] (brain or blood) and brain PO(2) are not proximal causes of either behavioral anapyrexia (hypothermia) or inactivity in goldfish exposed to oxygen-depleted environments.
authors.affiliation: Department of Biology, Organismal Section, Portland State University, Portland 97207, Oregon.
authors.forename: R N
authors.initials: RN
authors.lastname: Rausch
authors.forename: L I
authors.initials: LI
authors.lastname: Crawshaw
authors.forename: H L
authors.initials: HL
authors.lastname: Wallace
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D001833:Body Temperature Regulation / Q000502:physiology*; D000431:Ethanol; D006054:Goldfish / Q000502:physiology*; D000860:Hypoxia
chemical_list: D000431:Ethanol