The man appears to have been trying to feed fish when one latched onto his arm.
Video of the incident shows him wrestling with the huge fish for over a minute, dragging it along the jetty in an attempt to free his arm.
Some onlookers screamed while other pulled at its tail.
After almost being dragged into the water the man finally managed to shake the creature off and it swam away.
The video has been watched over 100,000 times on YouTube since it was posted two days ago.
Video of the incident shows him wrestling with the huge fish for over a minute, dragging it along the jetty in an attempt to free his arm.
Some onlookers screamed while other pulled at its tail.
After almost being dragged into the water the man finally managed to shake the creature off and it swam away.
The video has been watched over 100,000 times on YouTube since it was posted two days ago.