Is there a term describing a fish's mouth action as it breathes? [duplicate]
Solution 1:
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.
Solution 2:
Both the following words suit perfectly to express the referred action of the fish when they
- gasp
- gulp
for breath or air.