werefish

plural werefishes

1. rarefantasyA shapeshifter who can change between fish and human form.

   I do not believe Dr. Canard’s preposterous story. I do not believe in werewolves, wereducks, were-elephants or werefish.

   1986, Tales from Isaac Asimov's Science Fiction Magazine: Short Stories for Young Adults, San Diego, CA: Harcourt Brace Jovanovich, →ISBN, page 287

   2 more examples

   “That is indeed true,” said The Last Wizard. “But suppose you become a werebug, which could be crushed underfoot? Or a werefish, which would flip and flop in death throes on the floor of this cave?”

   1961, Ray Russell, Sardonicus and Other Stories, New York, NY: Ballantine Books, page 60

   First, does a fishman need water every time he transforms? Can he breath air? The scary thing about a werefish is that his species has a lot to be upset about: A "small" amount of pollution in his ocean affects the delicate balance under the waves.

   2006, Ben Dunn, David Hutchison, Rod Espinosa, How to Draw: Pocket Manga, volume 3, San Antonio, TX: Antarctic Press, →ISBN, unnumbered page