Not sure how effective UV is on parasites attached to the fish, or intestinal parasites.
Believe UV work's best by killing that which is free floating, and passes through the UV.
Prolly could catch equal number of Oscar's from stream's, lakes in Florida, and other warm water states.
Yeah I was thinking of the free swimming life cycle. Although you're right, you'd need to treat with metronidazole - mebendazole etc at the same time.
Florida eh? Releasing fish also releases diseases. Double whammy.