Sharks have patrolled the oceans for hundreds of millions of years, yet Eli Roth's documentary Fin argues the species is vanishing faster than most viewers realize.
What is Fin about?
Director and on-camera guide Eli Roth trades his usual genre-film instincts for a globe-spanning investigation, joining scientists, researchers, and conservationists as they track the commercial fishing operations pushing sharks toward extinction. The film moves between fishing ports, laboratories, and open water, laying out how demand for shark products has quietly emptied stretches of ocean that once teemed with predators. Rather than treating sharks as horror-movie villains, Fin reframes them as a keystone species whose collapse would ripple through entire marine food chains. Roth leans on his own history of casting sharks as monsters to interrogate the cultural fear that has made their slaughter easy to ignore, turning a genre filmmaker's toolkit toward a conservation argument.
About the cast
Eli Roth anchors the documentary both as director and as its central presence on screen, a deliberate choice given his earlier work built audiences around fear of sharks rather than concern for them. His conversations with the scientists and activists who join the voyage give the film its shape, letting expert testimony carry the argument instead of narration alone, and his own visible shift in perspective becomes part of the story.
Context & significance
Fin arrives in a documentary lineage stretching back decades, part of a growing wave of nature filmmaking willing to name industries rather than simply mourn outcomes. Its 2021 release and United States production place it squarely within that conservation-documentary tradition, and its genre-savvy pacing keeps a data-heavy subject watchable for audiences who might otherwise skip a straight nature film. The choice of a genre director as guide is itself part of the argument the film is making.
Watching Fin on Ktime
Fin is free to read about on K-Time, and streaming the documentary only requires signing in with a K-Time account, with no separate purchase involved. The platform's Farsi-language interface makes it easy for Persian-speaking households to browse alongside English-language titles like this one and queue it up for a family movie night.