Portland State University. Department of Biology
Larry I. Crawshaw
Date of Award
Master of Science (M.S.) in Biology
1 online resource (64 p.)
Goldfish -- Physiology, Brown bullhead -- Physiology, Temperature -- Physiological effect
Two species of fish, Carassius auratus and Ictalurus nebulosus, were subjected to cold acclimation regimes. Acclimation temperatures were slowly lowered to 3°c, then held for a period of time. At various times during this regime, fish were taken out and allowed to spend time in a temperature gradient to determine their preferred temperatures. Carassius were left in the gradient just long enough to determine a measure of the acute temperature preference, while Ictalurus were left in the temperature gradient for longer periods of time to observe any changes that might occur as the fish adjusted to selected temperatures. In both species of fish, lower acclimation temperatures and increased time spent at low temperatures caused a preference for lower temperatures in the gradient.
Lord, Alfred, "The effect of cold acclimation on the temperature preference of the goldfish, Carassius auratus, and the brown bullhead, Ictalurus nebulosus" (1987). Dissertations and Theses. Paper 3736.