"Grayling guts with unknown pearl like cyst or tapeworm. Never seen this before in our grayling."
These eggs from a trout caught in the Fish River, had unusual milky translucent capsules in it.
White cysts in the muscle of salmon could be caused by Henneguya salminicola also called "tapioca disease". It affects the texture of the meat but is not a health concerns for people. White cysts could also however, be from a tape worm. That is a human health concern. Guidance on how to check the cysts to confirm and how to prepare food so it is safe to eat, is provided.
If the cysts contain milky, white fluid, they are likely Henneguya, a harmless and relatively common parasite. But if they contain a larvae, they are likely tape worms which can infect people.
Silver salmon, caught 10 miles up the Twin Hills River, had small white patches in flesh.