This is an outstanding fish ID manual for the Pacific and Indian ocean region. It beats out others books of a similar nature with the number of photos (6 on every page for a total of over 2,500 pics) and the helpful identification notes below each pic along with the average size of the fish, localised habitat(if any)and pictures of the juvenile fish alongside the adult as well distinguishing feature between male and female forms and arrows pointing to distinguishing marks between similar fish of the same species. Fish are easily found from a photo you took or memory, as it places them into 20 identification groups according to body shape. The pictures are not quite the same quality as The Asia Pacific Reef Guide by Helmut Debelius but they are good enough. Unlike most books of this type it is fish specific so does not include any pics of molluscs, crustaceans, cephalopods, nudibranches, corals or other denizens of the ocean. You have to go to his Reef Creatures ID book for that in the excellent 3 volume Reef Set. Great book, highly recommended.