Do Fish Sleep?From the fifty one foot whale shark Rhincodon typus to a less than one half inch fish in the minnow family the tiny Paedocypris progenetica fish certainly carry a lot of weight . . . or do they? A fish's heft in water may vary, but these diverse aquatic animals certainly carry a lot of weight in our ecosystems and environment. From freshwater to ocean habitats, Judith S. Weis offers a fascinating look at these deceptively simple creatures. Fishes may