If you try to put a fish into anything other than an aquarium or fishbowl it will just flop around.
You cannot put a fish into a swimming pool.
You cannot put a fish into the ‘sea’ outside a basic condo.
I suspect this is as these areas have not been mapped (or whatever) to allow fish to swim.
Pls can this be fixed, my aquarium is not big enough for a 20 metre long fish.