Keep a Xbow and arrows on you, mix scuba and riot gear. When tame gets shocked try to swim away and pelt with arrows. Only way I have managed to save my tames. Especially dangerous to squids. They get stuck in body much like anglers and mantas. Lvl health on all water tames. Will need it for your pet to survive long enough for you to rescue them. Of course try and avoid them at all costs. They will sneak up on you, and when they do heed the above advice. Good luck.