We have selected Fish FAQ as the world's very best website on Fish.
The Fish FAQ website is published by the National Marine Fisheries Service, part of the National Oceanic & Atmospheric Administration, which is turn part of the US Department of Commerce.
The Fish FAQ website contains short illustrated articles answering hundreds of questions about fish, group as follows: Miscellaneous Fish, Salmon FAQs, Lobster FAQs, Crab FAQs, Shark FAQs, Shrimp FAQs, Shellfish FAQs, Cetacean (Whales, Dolphins & Porpoises) FAQs, Pinniped (Seals, Sea Lions & Walrus) FAQs, and Turtle FAQs. The questions answered in the Miscellaneous Fish section cover: Number of Fish Species, Oldest Fish, Largest Fish, Smallest Fish, Whether Fish Sleep, and Whether Fish Can Swim Backwards.
There is also a Fish Species List, with detailed illustrated articles on more than forty types of fish, grouped into the following categories: Principal Groundfish, Other Groundfish, Invertebrates, Principal Pelagics, Anadromous Fish, Flounders, and Other Fish.