These books are a must for any self-professed ardent marine naturalist because together, they are probably the best marine identification guide ever published. I bought the World Atlas of Marine Fauna (Pub. July 2009) from the book store at the Singapore Garden Festival. I didn't get the companion book for Marine Fish as I thought the one on Marine Fauna is probably more relevant to the reef trips which I have been participating in. Although a tad pricey at $180, it is truly a worthy and invaluable investment.