Cats and ocelots don't attack cods, salmons and tropical fishes.
Considering that cats eat fish, now fish have entities.
So the cat must be able to attack the fish, like a wolf attack skeleton.
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Though this seems more like a feature request and is probably WAI, I will say it makes sense. In the off chance that it was a bug though it's still in 20w11a
Relates to MC-141082