I don't know about doing that, even when you take fish from a pond you cannot just put it in another pond without some acclimating, the water temperature, native bacteria will be different. A lot of times fish raised in aquariums die when they are put in ponds because they are not acclimated to the water or environment. Is the fish coming from the same source water or is this an entirely new set up?
Happy gardening in Hawaii. Gardens are where people grow.