This episode of Wild On The Fly follows the team on their long quest for gold, a monster sized Golden Dorado on the fly in Argentina. Essentially a giant ill-tempered goldfish, these big predators are valued for their beauty and acrobatic aggression. After having some good luck around the hydro-electric dams on the Uruguay River, the team ventures into the wild to the Rio Juramento, a tributary of the mighty Amazon. Drifting down the river and casting into the snags proves hard work with these rare beasts, but all of a sudden, the fish come on the feed. Deep in the jungle, one of the crew feels a heavy pull and hooks into the biggest Dorado ever found on the Rio Juramento. This is fly fishing at its most extreme.