Not my cup of tea, but if you like em, more power to you!
I like utilizing everything I can out of the animals I kill, I smoke the bellies and bones, and I am frequently appalled at how wasteful people are with wild caught fish. When I look in the dumpster, I am disgusted by the lack of skill, care and efficiency that people process fish and game with.
I save the livers, hearts and gizzards out of the birds I shoot, share em with the dog or grind em into sausage. Fish offal is not something I have explored, maybe I will.
Benthic fish like rockfish and halibut almost always have anasakis on their liver and in their abdominal cavity. Salmon can have anasakis, although I have never seen it all over their liver like a halibut. The interwebs say the pic below is from a chum salmon liver.
I am not super interested in a roundworm infection, so I would be very careful about cooking everything pretty thoroughly before I ate any.