The point is to get one free, then you can work on the rest.
Don't you get the fact that Atlantis 'lied' to everyone from the start! It was never in distress, never floundering, never starving, they paid fishermen to catch it!
They have never had any intention of letting her go. It will die in captivity, 2 died in the states last year alone. These animals do not survive captive. They are protected and very little is known about them. Better to tag her and set her free.