Greenberg uses salmon, sea bass, cod, and tuna to illustrate the potential disaster of overfishing and destroying the seemingly infinite stocks of food fish in our oceans.  Combining hard scientific information with anecdotes about his own fishing, interesting personalities ( a Greek sea bass farmer, an Alaska salmon farmer, an Israeli endocrinologist, a Hawaiian fish farmer developing an alternative to tuna), Greenberg writes an engaging and informative story about the oceans and their fish inhabitants. From early man’s fishing in rivers for salmon, to the coastal fishing for bass, to the offshore fishing for cod, and the deep ocean worldwide search for tuna, man has continuously ratcheted up his pressure on the ocean food stocks.  Greenberg offers strategies for enabling these stocks to recover including expanding ‘no fish’ zones, developing farm fish more intelligently based on how much protein in feed is needed for one pound of protein in the fish, etc.  Good book.