Frogs, glass shrimp, sand shrimp, sw ghost shrimp, crayfish, gambusia, guppies, zebras, any local minnows, baby flounders, earthworms, pileworms, crickets, moths, tubifex, brine shrimp, fairy shrimp, sunnys, perch, ducklings, lizards, garter snakes, centipedes, and once a rat. Sort of depends on the fish, and what is around. As you can see, I am a fan of live food. I did feed a marbled goby and a couple of eels cat food for a while.