Based on his study of the nearly vanished aquatic economy of Chimalhuacán in the Valley of Mexico, Parsons describes the surviving vestiges of aquatic insect collection and fishing and considers their developmental and archaeological implications within a broad context of historical, ethnographic, biological, ecological, and archaeological information from Mexico, North and South America, the Near East, and Africa. Activities, implements, artifacts, and landscapes are richly illustrated, in many cases with the author’s own photos and a number of vintage photographs. The study concludes that aquatic resources were fully complementary with agricultural products during prehispanic times in Mesoamerica where a pastoral economy was absent.