I have been looking into a cheap animal protein source as a supplement to layer pellets and scratch grains for winter. Fish such as common, grass, bighead and silver carps (a.k.a. Asian carps) are at top of list owing to local availability. I live next to Missouri River where all four carps are abundant. For fun I also have been setting aside some salmon steaks to see how the birds respond. They go after such with same zeal they go after meal worms. Initially I thought the salmon was going to be a great deal more expensive than mealworms but on the basis of crop fill / chicken happiness, the mealworms cost about ten times as much. The salmon I am using is the highend individually packaged stuff. The birds are particularly partial the skin. This will be used with future training sessions to offset some of the mealworm costs. Down side is it might attract more predators. Chickens appear able to smell the fish very well and will peck at anything the fish came into contact with.