I just find all these things that produce venom really strange. How does a creature evolve the ability to make such a thing and then know that it will successful against things it hasn't even run into yet? That sucks about no antivenom but taking some stuff to boost up your metabolism should work enough. The blue ring octopus is deadlier than that. There's a reason we have lungs and not gills, we're not supposed to mess with those things in the water.