Mounted Fishes Collectibles?

Hi! I was wondering, is there a way to mod the mounted fishes so that they count as collectibles when the collection progress is randomly reset by the game? Because, as things are now, you have to keep the fishes alive in aquariums (or probaby in chests) to be able to make them valid collectibles when put into the inventory (but I prefer to mount the fishes to display them instead of having tons of aquariums in the house).
I know nothing about modding but I can give it a try if someone knows what things need to be changed to make this possible.