I waited a day to calm down. You can buy all those fish you mention including tilapia caught fresh every day at the fish mongers upstairs in the Chapala Mercado. Agua Milpa has commercial fishing for tilapia which grow up to about 2+ pounds there and a sport fishery for largemouth bass so they obviously get along. Although the bass is called largemouth it's mouth is generally not anatomically large enough to munch on turtles,baby ducks and, i'll throw in eggs too just for fun, along with other birds.If it does happen it's an anomaly and belongs in the Guiness Book of Records and would have to be a very large bass in the 10 pound+ range. I would take those youtube videos you've been watching with a bit of scepticism. Tilapia has become the commercial fish of choice here because of their rapid growth. They are farmed in pens off Mezcala Island as well as on land too.