Why Civilization Is Older Than We Thought:

The Calusa of southwestern Florida might provide a natural experiment for thinking about our Turkish neolithic site: a complex hierarchical society that built mounds, towers, and wide canals, yet engaged in no agriculture. A grand temple—if that is what Göbekli Tepe was—wouldn’t have been beyond their abilities. Instead of the granaries posited by conventional accounts of the origin of civilization, they built “watercourts” to store the rich catches of fish they harvested from the waters of the Florida Keys. The Calusa were a relatively advanced society built on aquaculture instead of agriculture.

Well worth a read (it’s long). It’s not crazy anymore to suggest such things.