"...A researcher named Dr. Marie Poland Fish once auditioned every species
of North Atlantic fish she could collect and found that they thump, cluck,
croak, bark, rasp, hiss, growl, swish, spit, scratch, and quack. Eels
bubble and fish grunt, and striped bass utter an 'unk.' During World War
II, croakers in the Chesapeake Bay made such an underwater rumpus with their
rhythmic chugging that they fooled the coastal defense network into thinking
it was under invasion.
Some fish produce their sounds by grinding teeth or rasping spines, but
most are percussionists. They make a drumming noise by contracting special
muscles on each side of a resonating air bladder. Nearly all fish
experience a deepening of their voice as they grow, except the trout, which
remains a treble all of its life...."*

Wouldn't you just know it.......a fish that never grows up, pursued
by.......well, you know.

Wolfgang
*from "Notes from the Shore", by Jennifer Ackerman, Penguin Books, 1995,
p.68.