I realize the message of this book is that man is the true predator, etc, etc, but I seem to have taken away from it another, unintended message: Don't ever go swimming again. And hey, while you're at it, also stay away from the edges of bodies of water, you never know. Also, proselytize to all your friends about the dangers of water, fresh and salt alike.
On a serious note, I loved this book and I've read it twice. I recommend it without reservation if you live in any of the land-locked states.