The fishermen search for locations where bluefin tuna are known to congregate and feed. Meanwhile, Captain Tyler begins a search for new hot spots.

A fishing tournament in Gloucester kicks off; and the crew of the Pin Wheel play a prank on the Odysea's Captain Ralph.

The fishing teams are threatened by great white sharks. Included: A shark slams into the Christina; Tyler must risk life and limb to untangle a harpoon line from the Pin Wheel's propeller in the shark-infested waters.