Beijing - Fishermen in the eastern Chinese province of Zhejiang caught on Thursday an unknown fish weighing more than 10 tons, the Sina news service reported.

The unusual fish, which was 12 meters (39 feet) in length and more than 1 meter in body diameter, was caught in a trawler's net and towed to the nearest port, where it was pulled from the water by a 15-ton cargo crane, the news service said.

Scientists will not get the opportunity to solve the mystery of the fish as it was sold to a Chinese man for about $220.

The world's biggest fish is believed to be Whale Shark (Rhinodon typus) which can often grow to 13.7 meters (45 feet) and 15 tons.