Why fish visible in water?
It adds a new possibility, such as to go into the water to kill them with a knife or gun or to catch them with a fish trap, It immediately gives you a better view in the environment.
Different fish
I think Unturned 4.x will definitely get more maps with different climates, It seems convenient to let different fish species swim in the water in different maps!
How to catch a fish
Normally you always fish with a fishing rod to catch a fish, if fish swim in the water you can catch them by hand or with different weapons, or with a fish trap!
When a fish dies it floats up, it also seems to me a nice addition if you throw a grenade into the water that you can kill a large amount at once with a grenade. ‘‘What I would do x)’’
End / Question
I hope this will be added in Unturned 4.x, it would be nice to see birds flying because I thought its strange when I played Unturned 3.0 that I heard birds but did not see them, hopefully everything will go smoothly that we can play Unturned 4.x soon!
I covered this in my Wildlife, Hunting, Fishing, and Foraging [Long Post] post. You didn’t even include “tickling.” Otherwise your post is fine.
Oh and by the way, shooting fish in generally a bad idea, as water drastically slows down bullets.