It's on the price sticker from the fish counter, read the tiny print. "May contain phosphate as a preservative agent". Joe, Christy, and I saw this the last time we were making food. Some items said "may", others said "contains", while others said nothing at all. We soaked everything in RO/DI for a while before blending. I'm battling a little cyano right now, which might or might not be attributed to the phosphate in the food.
I'm also looking for a fresh seafood source.