US rescuers searched for a third day on Tuesday for a Hawaii fisherman who went overboard from a boat after hooking a tuna over the weekend.

Mark Knittle, 63, of Captain Cook, was fishing with a friend off Honaunau on the Big Island on Sunday, when he hooked an ahi, or tuna, police said.

“The friend heard Knittle say, ‘The fish is huge,’ then saw Knittle go overboard into the water,” according to a police news release.

Mark Knittle went overboard from a boat after hooking a tuna over the weekend, authorities said.
Mark Knittle went overboard from a boat after hooking a tuna over the weekend. (Hawaii Police Department via AP)

The friend tried to grab the line, but Knittle disappeared within seconds, the release said.

The friend jumped in but couldn’t see Knittle.

The search was expected to continue through Tuesday, US Coast Guard spokesperson Petty Officer Ryan Fisher said.

The Hawaii County Fire Department was helping the Coast Guard search from the sea and air.

a yellowfin tuna fish with a hook in its mouth from fishing
Ahi can weigh more than 180kg. (Getty Images/iStockphoto)

“Usually our incidents like this are along the coastlines. This is a different situation because it’s out in the deep,” Darwin Okinaka, Hawaii County Fire Department assistant chief of operations, said.

According to police, Knittle and his friend were 6.4km from the Honaunau Boat Ramp.

“If there’s a fish that’s actually pulling him around, you don’t know where he could go,” Okinaka said.

Ahi can weigh more than 180kg.

Police described Knittle as weighing 84kg.

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