It is only used in fish meal and is used in some human spices......
I did a huge study on this and the problem is the US Coast Guard requires it's use if the meal is ""made at sea"". Manufactures can get a specil permit but it cost money....Here is what I found.
Canadian manufactures are not bound by that law and Champion foods(Orijen & Acana), Horizon/Horizon Legacy and Petcurean (Go,Now and Smmit) DO NOT USE IT nor do their supplies.
American manufactures Wellness and Artemis have the special permits.
Every other dog food manufacture in America that has fish meal in it most likely has been preserved by the big bad E by their suppliers. I emailed every decent dog food manufacture and I certainly got a lot of BS.
Nature's Variety says their fish meal is frozen by their suppliers.
Merrick, Breeders Choice, Timberwolf, Nature's Logic and Fromm all stated that they did not buy from suppliers that did use it.These were the only companies who stated that their suppliers did not use it.
Naturapet, (Evo, Innova, California Natural, Health Wise and Karma) states it loud and clear on their web site, that they do not buy from suppliers who use it. But P & G bought this company so I know this company well change that, because it is a added cost to the manufacturing process.