Gigantic Shark Caught During Reality-TV Shoot

Texas fisherman shooting for "Jim Shockey's The Professional" reeled in a 1,300-pound mako shark.
1:40 | 06/06/13

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Transcript for Gigantic Shark Caught During Reality-TV Shoot
fisherman reeling in what might be the world's largest known shark, mako shark. 11 feet long, over 1300 pounds. Abc's john muller has the story. Oh! Reporter: It was a long battle. Man versus beast, wet and wild. Take a look as texas fisherman jason johnston reels in this giant mako shark, more than 1300 pounds of sheer force. When they pulled it up the boat, you're in shock. Disbelief. You have a 1300-pound creature as wide as the boat. Reporter: During several intense moments it looks like johnston and hi crewmates could fall into the water or those ominous jaws but then victory. Reporter: He has a volkswagen on the end of a fishing reel and makes you feel so small. Reporter: It's not a coincidence this was caught on tape. They were shooting footage for "jim shockey's the professional." Waiting four years to see this thing. Mako shark right here. Reporter: He and his buddies would later learn he could set a record at 1,320 pounds. It's 102 pounds heavier than the largest mako catch on record but not everybody is happy about it. Some conservationists say they're a threatened species worldwide and should be released if caught. They say it's needed for scientific research. The whole spirit was to go out and have a lot of camaraderie and do something good to preserve the species. For "good morning america," john muller, abc news, new york.

This transcript has been automatically generated and may not be 100% accurate.

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