Abstract
Partial ultimobranchialectomy significantly increased the extent of the increase in plasma calcium and chloride concentrations in goldfish during acute transfer from fresh water to 30% sea water. The operation did not affect plasma calcium or chloride in goldfish held continuously in fresh water nor did it affect plasma sodium concentrations in fresh water-adapted fish or in fish subjected to acute transfer to 30% sea water. Partial ultimobranchialectomy did, however, produce a consistent reduction in hematocrit. These data are consistent with the hypothesis that the ultimobranchial tissue of this fresh water teleost performs at least some function in hydromineral adjustments to acute exposure to 30% sea water.
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