Every year in late spring and early summer, along coastlines from Alaska to the Gulf of Mexico, a fish called the plainfin
midshipman uses its swim bladder to emit an odd droning sound in hopes of attracting a mate.
Thus, to sustain an hour - long mating call, the
midshipman muscle releases, and subsequently pumps, only two times as much calcium as the toadfish
uses to make intermittent calls over the same time period.