Critters can occasionally burrow in the nooks and crannies and especially in the tube connecting the stem to the cap.
Once you’re encountering Morels in a restaurant, all that should have been brushed and flushed out. At home, it’s one you to do it yourself. Clean, brush and wash out Morels - though a good wild source will know to do this too.
When I was in college I spent a couple summers working at a salmon cannery in Alaska. I was amazed at the number of worms in the fish, although it was interesting how the number varied based on the species. The Chinook, Coho, and Sockeye had very few worms, while the Pink and Chum (Keta) salmon were totally infested.
Found this one today, soaked it in salt water and one little roly-poly bug ended up coming out. I don’t know about others, but when I cook morels, I clean them inside and out, and then slice them up. Otherwise, they’re a bit too big…unless they are little ones. Then I’d halve them.
Is your photo of the nerve thingy you found in the flounder?
Was the salmon wild or farmed? And is there any greater likelihood in one or the other? I could imagine that farmed fish might be more prone to parasites – or less, if they are fed something to ward them off.
As it happened, my wife insisted on buying salmon yesterday – after I’d read this thread. “Thanks, Alan, for spoiling my appetite completely,” I was thinking.
Fortunately, neither of us was in the mood for a full meal when we got home from the store, so the nauseous thought have been postponed. (It’s frozen sockeye.)
By the way, what did you preserve that nerve before taking it to the lab? Do you have formaldehyde around the house? Grain alcohol? Or did you use leftover Coche Dury?