Marine Life Learning Center: Kid's Corner: Describes how different kinds of fish look, what they eat, and how they stay clean.
Oceanography in Atlantic Canada: An interactive exercise which explores animal adaptations, specifically fish camouflage. Users drag fish images to their correct location in the ocean based on their camouflage.
Photo Gallery of Paul Humann and Ned DeLoach: Underwater pictures of different types of fish from different parts of the world.