Peterson Field Guide to Freshwater Fishes, Second EditionThere are nearly 1,000 species of freshwater fishes in North America alone, and identifying them can sometimes be a daunting task. In fact, in just the twenty years since publication of the first edition of the Peterson Field Guide to Freshwater Fishes, the number of species has risen by almost 150, including 19 marine invaders and 16 newly established nonnative species. This second edition incorporates all of these new species, plus all new maps and