Sharks become immobile when turned over

California orcas can flip over young great white sharks,inducing TI for so long the immobilized sharks,who must move to respire, essentially suffocate.Humans can also flip sharks into TI.By stroking a shark’s electrically-sensitive snout and gently turning it over,researchers can induce TI that lasts up to 15 minutes.That’s enough time to insert tags,remove hooks,and even perform surgeries.There are risks however:TI can hamper respiration and induce hyperglycemia, a sign of stress.So this technique should only be used when necessary.