Isaac Brumaghim, 37, caught a kawakawa tuna while fishing from a kayak in the Pacific Ocean, 2 miles off Waianae, Hawaii -- but a 9-foot-long tiger shark grabbed the fish as Brumaghim tried to reel it in.
The shark then bumped the boat and swam away with the fish, KHNL-TV, Honolulu, reported.
"The shark made a circle, came around and ate the kawakawa under my boat," Brumaghim said, "and then it kind of hit me what had happened. Yeah, I did get the shivers a bit, on just thinking about the whole thing."
Marine biologist Wayne Samiere said it was likely a 400- to 500- pound tiger shark.
The incident was caught on a camera Brumaghim mounted on his boat. He posted the footage online, calling it "Chompy the shark," and says he is astounded by the attention he is receiving, Sky News said.