SOLUTION TO KILLABLE FISH!!

I think a good compromise would be to add a decomposing mechanic where if you kill a creature, eventually after like 3 ish days or maybe the body decomposes and disappears, and then respawning. That way you can still defend yourself and clear an area, while the local ecosystem and level design of the area stays intact! Idk if anyone has thought of that but it seems like something that could be doable.