You guys shouldnt use "In the Wild" argument. Fish in tanks arent in the wild. Also, how do you know if fish in the wild dont die from eating snakes or other things people say they eat in the wild? Sure they can eat it, but do you know if they all live?
Anyway, you should be more careful on what you feed your fish. If you wanna be risky and give them something you caught outside, be my guest.