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I would wager there must be a term of art describing what a fish does as it breathes, normally, underwater. Any thoughts?
According to various source, Aquatic Respiration appears to be the definition for the act of acquiring oxygen for a fish although "aquatic" would be redundant in context of the OP.
Literarily, inspire could be used, if only by its secondary definition.
Both the following words suit perfectly to express the referred action of the fish when they
for breath or air.