Warning: Video features sharks being caught and killed.

MrWeinerProductions has shared a mini-documentary on YouTube about shark fisherman Mark Quartiano, aka “Mark the Shark.” The segment is part of Cadillac’s Business Unusual series and follows Quartiano’s charter fishing business, which specializes in “monster” fish.

While Quartiano has achieved fame from killing sharks, the video does reveal that he also participates in catch-and-release tagging of some protected species in cooperation with marine researchers.