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I found that the Humann books for the Caribbean helped immensely with my ability to ID fish in Hawaii. There are some good ID books for Hawaii, but they are very hard to use at the beginning. The fish outlines and the organization of the the Humann book really helped me get a handle on the most basic ID of "butteryfly vs. parrotfish vs grouper, etc."I took the course live, so don't know how well the CD teaches but it should show you how to ID the 50 most commonly seen fish by family characteristics (which will help later when you see an unknown fish)
I'm a big fan of the 24 page waterproof books. Very little text, but it has photos of the most common fish. I have it in my gearbag and often use it during the SI when people are describing a fish they saw. Since it's waterproof it's convenient to use while dripping wet right after getting back on the boat. It doesn't work as a standalone book -- it really is just a companion tool for someone that already is familiar with the main Humann book.Another great item, if you don't want to pack those heavy books and do travel with a laptop, is the REEF/Reefnet Fish ID DVD.