Using custom boats and expert aim, four generational harpoon fishermen compete to land the first monster bluefin tuna of the season, worth thousands.

Captains Joe and Tyler hit bluefin gold as struggling strongman Niko Chaprales changes tactics in hopes of living up to his famous father’s legacy.

As Joe fights to keep his lead, all bets are off when a legend joins the derby. Emmett struggles without a plane until his dad harpoons a giant.

At the mid-season peak, three centuries-old fishing strategies compete. Joe relies on instinct, Tyler turns to science, and Niko relies on tradition.

Battling with Tyler for the lead, Joe partners with Niko. But when Niko's zapper fails at the worst possible moment, Tyler steps in to save the day.

As the giant bluefin gorge themselves on schools of fatty baitfish, captains battle to capture oversized "quota-killer" tuna. Young gun Joe scores a rare hat trick, landing three in a day, while veteran Tyler struggles with both science and technology.

A change in weather forces Tyler to shift his strategy, and he scores big. Joe takes to the air instead, racing to find a lone tuna he spots at sea.

As Joe and Tyler fight for the top spot in the season finale, Niko tries to steal it -- but everything comes down to the final weigh-ins at the dock.