Picture Source: http://www.thebiopod.com
I recently discovered a nice population of Soldier Fly Larvae in my compost pile. They tend to be under moist newspaper, rotting tomatoes and other fruits and veggies. The great thing about Soldier Fly Larvae is it's free food for the chickens.
On the weekends or after work, we will take the girls out of there chicken tractor and let them have the lay of the land. They usually run straight towards the compost pile. And if you have ever seen a chicken run, it's worth the price of admission just watching there heads bobble back and forth trying to be the first to the food.
The good thing about Soldier Fly Larvae is it's 42% protein and 30% fat. It can also be frozen. Which means being able to give your chickens a high protein food in the winter months when food is harder to come by (that is if you let your chickens free range or you pasture them in cages, which helps supplement there feed).
Anyway, hope this helps you to think outside the box when looking for protein supplements for your chickens (or fish).
"We can complain because rose bushes have thorns, or rejoice because thorn bushes have roses." ~ Abraham Lincoln