Presents an introduction to fish, in simple text with illustrations, describing the physical characteristics, habitat, and life cycle of a variety of aquatic life, including sharks, eels, catfish, coral reef, and more.

Watery worlds -- Inside a fish -- Fish through the ages -- Fins, tails, and swimming -- Gills and breathing -- Skin, scales, and color -- Fishy senses -- How fish breed -- The shark group -- "Snakes of the sea" -- Catfish, cod, and anglerfish -- Flattened fish -- Fish of lakes and rivers -- Seashore fish -- The colorful reef -- Open ocean dwellers -- Fish of the deep -- Fish in trouble -- Animal classification -- Animal phyla.