This is one of my favorite books. It provides information and more importantly photos on nearly 2000 fish. The information gives you the basics about each fish, how big they get, what they eat, are they agressive, etc. But the best aspect is the photos. With over 1900 photos it is the first book I go to when I want to look up a fish. Or when I'm thinking of what to put in that empty tank I'll often browse through this book looking for neat fish.This book gives you the most for your money!