Off the Hook (S01E08)

Abandoned by their guides in a treacherous region, the crew is compelled to navigate through uncharted land, confronting real peril as they traverse stingray-infested waters. They stumble upon a menacing poachers' camp and come face-to-face with armed hunters. With their scientific mission hanging in the balance, the team ventures deeper into the jungle in search of a massive 200-pound piraiba for sampling. Just as Cyril hooks the colossal fish, he finds himself in a fierce struggle, being pulled into a river teeming with enormous black piranhas.