EACH STEP OF THE WAY, EVA PILGRIM, THANK YOU. >>> TURNING TO THE INCREDIBLE VIDEO OF SHARKS IN A FEEDING FRENZY OFF THE COAST OF LOUISIANA, WHIT JOHNSON IS HERE WITH THAT AND THE FISHERMAN WHO CAME ACROSS THIS SCENE AND WHAT HE IS SAYING ABOUT THIS DAY. COULD IT BE WE NEED A BIGGER BOAT. >> DEFINITELY. GOOD MORNING TO YOU. THIS DRAMATIC FEEDING FRENZY IS KNOWN AS FOAMING. SHARKS ALL REVVED UP WITH BLOOD IN THE WATER BITING IN ALL DIRECTIONS TO EAT AS MUCH FOOD AS POSSIBLE AND ONE GROUP OF FISHERMEN FOUND THEMSELVES RIGHT IN THE MIDDLE OF THIS KILLING FIELD. CHAOS IN THE WATER OFF THE COAST OF VENICE, LOUISIANA. DOZENS OF SHARKS IN A FEEDING FRENZY, THE WATER APPEARING TO BOIL IN A STEW OF GRAY FINS. FISHERMAN MARK HARDESTY SAID THEY CAME ACROSS THIS WILD SCENE. >> ALL OF A SUDDEN WE STARTED EXPERIENCING THE SCHOOLS OF FRANTIC FEEDING SHARKS THAT WERE DEVOURING BAIT PODS AND THEY ERUPTED ALL AROUND US AND THEN UP UNDER THE BOAT. >> Reporter: THE SHARKS STARTING VIOLENTLY UNDER AND AROUND THE BOAT SENDING A SPRAY OF WATER ON BOARD. >> I'M GETTING SOAKING WET. >> Reporter: HARDESTY SAYS THEY WERE 15 MILES OFF THE COAST WHEN HE THIS NOTICED THE DISTURBANCE AND REALIZED IT WAS A LARGE POD OF FISH. THE SHARKS SUDDENLY APPEARED. >> IF A PERSON HAD FALLEN IN YOU WOULD NOT HAVE FOUND THEM AGAIN. >> Reporter: HE'S BEEN FISHING IN THE GULF FOR 15 YEARS AND SHARK SIGHTINGS ARE BECOMING MORE FREQUENT. BUT THIS DAY ON THE WATER IS ONE HE'LL NEVER FORGET. >> WE COULDN'T EVEN FISH AROUND THEM BECAUSE THEY TOOK EVERY LINE WE HAD. IT WAS JUST A MESS. >> Reporter: NOW WE SPOKE TO A MARINE BIOLOGIST WHO TOLD US IT'S DIFFICULT TO KNOW WHAT KIND OF SHARKS THESE ARE BUT SAYS BOTH SPINNER AND BLACK-TIPPED SHARKS CAN BE SEEN IN LARGE NUMBERS DURING THEIR ANNUAL MIGRATIONS. EXPERTS REMIND US IT'S BETTER TO RESPECT THE SHARKS THAN FEAR THEM, GUYS. >> THAT'S PRETTY GOOD ADVICE. >> OH, OKAY. >>