We recently stopped feeding pet food fish b/c of the rancidity factor that BCnut refers to and also the ethoxyquin.
http://healthypets.mercola.com/sites/healthypets/archive/2012/01/03/fish-as-a-protein-source.aspx
You could use a pre-mix with fresh fish, canned sardines if you can’t bring yourself to feed other types of animals, and alternate with some veg meals (humane certified eggs, veg pet food, etc).
You can also buy the highest humanely rated meats (already prepared or raw) at Whole Foods and use with a pre-mix. If you can’t deal with the preparation aspect, Primal and Answers pet food are certified by the Global Animal Partnership…the same system used by Whole Foods that rates humane conditions and certifies feed gmo-free. And there are hopefully more out there I don’t know about.
Some companies use pasture raised and pasture finished so no factory farms or feed lots, like Healthy Pet Products, Stella and Chewys and Dogs for the Earth.
Dogs for the Earth raises their chickens above and beyond humane guidelines. Generally pet foods with wild boar/bison are free range too. Just some options you may want to consider.
