I have caught tilapia in my pond on almost anything. I've caught them on minnows, worms, corn, green beans and dead shrimp. I have found however that if it is a sunny day it is very difficult to catch them until dusk. I think that there must be thousands of them in the pond ranging in size from minnows to two pounds. I have also found them to be excelent to eat and plan on putting them in the pond again next year. I only have good things to say about them and would reccomend them to anyone wanting to increase the productivity of their pond and at the same time remove pond algae.