All the fish in the world

"What makes a fish a fish? . . . As Trout and Mudskipper explore below and above the world's waters, they are introduced to a multitude of fish in various shapes, colors, and sizes, forcing Trout to rethink about his notion of what a fish is. Maybe there is a vast watery world of unimagined possibilities (like a walking fish, or a fish with a transparent head!). And maybe, just maybe, there's not just one way to be a fish-but many, many ways!"--Provided by publisher.