The information until a fish is spoiled and that a fish is spoiled is not available as long as the fish is in the inventory, only when we take the fish out.
There is also no way to tell as long as our Zois are on a boat because they refuse to take the fish out as long as they’re still on the boat.
So if we’re out fishing to display fish the tanks, it’s often too late and the fish is spoiled/dead.
Also the fish spoil pretty quickly, which might be realistic, but it’s a hassle when we’re out fishing. We’d need to go back to put the fish in the tank soon after we caught it.
Maybe a bucket or vessel with water to keep the fish alive would be an option.

