A NOTE ON WATER BALANCE IN THE GOLDFISH, CARASSIUS AURATUS L., DURING LETHAL HEAT SHOCK

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Abstract
Heat death in goldfish acclimated to 20[degree]C and abruptly transferred to temperatures between 36 and 38[degree]C was accompanied by a decrease in plasma chloride concentration, but not by marked change in tissue chloride levels. Tissue water content increased by approximately 3%. Variations in chloride space indicated that water taken up during heat death was localized in the extracellular compartment. A progressive shift of fluids from the cellular to the extracellular phase also contributed to the expansion of the latter compartment. Although the data indicate some degree of osmoregulatory breakdown during exposure to lethal increases in temperature, the changes observed were not considered to have been of sufficient magnitude to constitute the sole cause of thermal death.

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