It could have been anything inside the fish, anything that came in with the fish, and anything that fell in with the fish or the giant machine that cut the fish up and shoved it in cans to be cooked.
This reminds me of the thread where someone had found a growth in a bell pepper, like this one. Panic and cries of “Gross!” ensued.
You people are sissies. You pay more for "perfect"veggies and other food that has been carefully prepared so it looks factory made, instead of coming from a living thing. Oh, well, more for me.
You people are eating the little baby peppers, ripping them from the big red pepper womb? If Rick Santorum finds out about this, you will be in big big trouble, you baby pepper murderers!
I always inspect the contents of a can of salmon very carefully, taking great pains to remove bones and icky black skin. That stomach-y thing would give me pause, as would finding an eyeball in a can.