Water or electricity don&#x27;t lead to infection in other nearby starfish, which is probably needed here because it&#x27;s going to be hard for a robot to find and kill all, or enough, of them. Which at the same point is also something to take care of: I hope the inventors checked the range of starfish etc, so that this won&#x27;t lead to massive starfish death in places far away from the coral reef being meant to be protected.