User blog comment:Neowitch/Of Swamps, Curses and Turtles/@comment-5640399-20130519020659/@comment-4493594-20130519100650

Thanks for commenting. Productive comments are always appreciated.

About the Gasu Gasu no Mi, you certainly can hold your breath for several minutes and survive but only if you prepare yourself. If someone just suddenly cuts off your oxygen without warning, you won't be able to hold your breath for as long as you normally could. And in this little time you have to think fast, find your attacker and do something, which might involve a lot of moving around. All of which is hard to do without oxygen.

I didn't know about the Axolotl. This certainly makes a lot of sense. And explains a lot. Then again, wouldn't a starfish be a more suitable animal for such a regeneration ability? You can cut those things into half and both halfs can live on.