That does seem kind of neat, but it still doesn&#x27;t make sense to me. You have to carry a poison supply that will run out. You need 12 mL per starfish.<p>Is that really more effective than just injecting lots of seawater? You could pump in seawater by the kL, not mL, and you&#x27;ll never run out. The starfish will surely die after all bodily fluids have been washed out with seawater.<p>The other idea that comes to mind is a needle with an electrified tip. Depending on voltage and current, this kills in various different ways. You can heat the animal, zap the nerves, or (via electrolysis of salt) fill the animal with either chlorine or sodium hydroxide.