@birdsandbats They'll be pure, LRWC is big on pure breeding programs. They also have a great history with Hawaiian species, holding the first breeding records for both Laysan Teal and Hawaiian Goose. The only other place I've seen this species is Plzen Zoo.
@birdsandbats Update: I've recently learned that no Hawaiian Ducks are 100% pure, at least not in captivity including in Hawaii. These birds are about as pure as they come, though. Also, Sylvan Heights keeps this species as well.