A fisherman caught a huge barramundi from a river in the central province of Quang Binh early Friday, Sai Gon Tiep Thi newspaper reported.
Nguyen Van Phuong, 37, was rowing a boat on the Son River to pick up tourists for a tour to Phong Nha Cave at around 4 a.m. when he saw the fish.
Phuong used a javelin to stab the fish but it struggled and pulled him and the boat along for more than 500 meters.
The fish stopped when it became weak. Phuong jumped into the water and managed to pull it ashore with the help of his wife.
The barramundi weighed 40 kilograms and measured more than 1.5 meters in length.
Phuong later sold the fish to a local restaurant for VND6.7 million (US$325).
He said he would use the money to build a new house since his house was swept away by floods in October 2010, while he was busy with his boat trying to rescue fellow residents.
The barramundi (Lates calcarifer), also known as Asian seabass, is a species of catadromous fish, widely distributed in the Indo-West Pacific region from the Persian Gulf, through Southeast Asia to Papua New Guinea and Northern Australia.
Its average length and weight are 1 meter and 20 kilograms respectively.