Making a fish fillet

How do I make a fish fillet that can be used with recipes from a fish corpse? I tried activating my hunting knife and using the ‘Cut’ action, but the game is saying the fish is made of material that can’t be cut up. Activating or Disassembling the fish similarly doesn’t work. What am I missing?

'B’utcher the fish.

Thanks! I’m not sure why that didn’t occur to me before.