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Abbreviations: IPHP, isolated, perfused head preparation; TAP, triaminopyrimidine; TEP, transepithelial potential.* Since the eiasmobranch fishes (sharks, skates, etc.} maintain isotonicity to sea water via the retention of urea, they are an exception to this statement about net movements of water. However, it is important to note that their body fluids contain significantly less NaCl than sea water, so they still face net influxes of these ions in sea water (see Evans, 1979, for a more complete examination of eiasmobranch osmoregulation).** Henceforth we will he dealing with teleost fish, with only slight reference to the elasmobranchs, until the last section of this review.

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