The reason I came to Amazon in the first place. This is an excellent guide. It is complete, a vast array of fish. Information on identification, with (through still pictures) an idea how the fish look underwater. Also information on behaviour. The only minor point are the drawings. Although they are clear, they are quite dull (B+W) and when a key identification is a colour, well, that just doesn't work. A good idea would be do use arrows for key identification features (like in birdwatching-books). Recommended for cold water divers and other people with a biological interest.