The ultimate reference for snorkeling and diving the Caribbean. Weights an absolute ton but allowed us to name everything (contrary to some of the others diver's guide books!) It is well organized in sections that regroup fishes with similar features or behavior (bottom dwellers vs swimmers, odd shaped vs oval, lips, color etc) so it is very easy to narrow down ID. The schematic drawings that points out specific distinguishing features to look for are great, if you cannot come to a positive identification from memory, at least you know what to look for on your next dive! All the information you want is there : expected depth, size, behavior, reaction to divers as well as description and pictures of juveniles. Coral and Creature books offer the same perfect balance between easy use and rigorous information. A must!