A photo shows two fishermen using long knives to cut the tail of "the world's biggest whale shark" with several passers-by watching and taking photos on a dock at Pingtan County in Yangjiang City, Guangdong Province, on August 6. [Photo: weibo.com]

Two fishermen suspected of involving in a viral video called "killing the world's biggest whale shark" are being sought by the fishery department in Guangdong Province.

It's believed the two are out on the water now, in the fishing boat that was also seen in the video.

In the video, two men use a long knife to kill a whale shark and cut it into pieces, as they are crowded by screaming people and others who took pictures with the whale.

The uploaded video has been criticized by many Chinese netizens, saying it is cruel and heartbreaking.