I just received my copy of this book from the DEP online store, and I have to agree with Adrian about the value. The department could easily be charging twice as much for this book.
In addition to what Adrian has related, I also like the info on stratification. If a body of water is deep enough to stratify, this book will tell you where the oxygen gets too depleted to actually hold fish. This alone is worth the $19.95 price!
Already planning for the spring......