Harpoon Hunters

A group of harpooners chase some of the highest-priced fish using fast boats and good aim.

Captains Joe and Tyler hit bluefin gold as harpooner Niko Chaprales fails to land even one

Captain Joe Dion takes his sons to sea, witnessing a great white shark feeding on a humpback whale.

As the fleet spots the first giants, Joe fights for his lead; Dylan gets a $6,000 tuna.

Bluefin season peaks as three old fishing methods vie for supremacy

With the use of spotter planes, veteran Tyler and young gun Joe battle for the most monster bluefin

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.

With less than a quarter of the bluefin quota still available to catch, a change in weather forces captains to shift their strategy. As Tyler quickly scores three big fish, Joe takes to the air -- he spots a lone tuna, then races to find it at sea

Captains Joe and Tyler are in a heated battle in the season finale. Fighting for the top spot, dark horse Niko spots a chance to steal the lead. With the biggest catches of the season yet to come, it all comes down to the final weigh-ins at the dock.