By chowing down on tilapia and enjoying the lake's unbounded cover, bass numbers have exploded. Other than a few herons and cormorants, adult bass have no natural predators in Picachos. The lake is all catch and release. A quick side note on this: When officials dammed the river to build the lake, they flooded seven villages and displaced hundreds of people. The Mexican government set up those villagers (who were mostly cattle ranchers) in new homes, whereupon the villagers banded together and fought for shares in all the businesses that run out of Lake Picachos—including Chapman's. This means Chapman is working closely with the locals. They are his business partners, and he's also hiring them as guides, cooks, waiters, and maintenance men. If the bass fishery thrives and Billy's business does well, everybody prospers. In short, nobody is poaching fish out of the lake.