i always go to the local pond or river and catch tons of crayfish. they are dirty, but the gars haven't complained yet. i keep an eye out for parasites, all looks good so far after several years. since most of us keep illegal fish, another option is to go fishing and keep the small fish instead of throwing back like your supposed to...lol...i know i know...but its fun and cheap source or large food. red bellies love trout!!