This book, like all publications from these guys, is a fairly comprehensive field guide for marine species in the region, including some notes about behaviors and ranges of habitation. However, I continue to struggle with its non-scientific arrangement, where species are lumped together according to their morphology (i.e., "large bodies with fat lips"). It may be an easy way for the novice to locate something he/she has seen underwater, based upon physical characteristics, but it doesn't necessarily work well for the more advanced user. Nonetheless, I bought it, knowing what to expect, and it's worth the money.