I just got back from a visit to Ucluelet on Vancouver Island. They have a mini-aquarium there that is phenomenal! Every spring they dive to collect local oceanic animals and set up this aquarium. Then, every fall they dismantle it and put the animals back in the ocean.
You do need a permit to harvest animals from the ocean! They obviously have one.
My point, however, is that you may get information on keeping or releasing Himself's critters from the biologist at the aquarium. They are huge into education there and very helpful.
The website is
http://www.uclueletaquarium.org/
I'm sure if you email them they can help you.