Hi Carol and Eileen.Is it a river where people fish? I detest fishing with a vengeance,BUT surely if some one could be persuaded to try and get them out(probably the only way to catch them) with obviously a barbless hook and some means of then transporting them,plus a home lined up,it would be worth a go,surely.I expect they will survive,as they survive in cold ponds in the winter,but they won't be used to getting their own food.Also an unscrupulous fisherman,or some horrible ignorant kid,could fish them out and show them off as a rariity.Worth a try?