Internal convective and conductive heat loss in the mudpuppy,Necturus maculosus

• 1.1. Intestinal temperatures of 10 mudpuppies (Necturus maculosus) subjected to an instantaneous decrease of 6.0°C in water temperature were monitored while animals were alive, alive with gills tied and dead.
• 2.2. The rates of cooling: alive > alive gills tied > dead, were consistent in all animals.
• 3.3. Comparisons of data for live and dead mudpuppies indicated that conduction accounted for a mean of 68.5 and therefore convection 31.5% of total heat loss in these experiments.
• 4.4. The external gills were the site of approximately half (54.4%) of total internal convective heat transfer with the remainder occurring through the body surface.