Fishermen have caught a giant grouper that weighed 683 pounds (310kg) near the Nansha Islands. The fish was sold to a hotelier in Dongyuan, because apparently that's what one does upon catching an utterly massive mutant fish.
Groupers are deep sea fish that usually weigh under about 3.3 pounds, or 1.5 kilograms.
Just last month, a 50kg bighead carp was cooked in the 23nd Chinese Chef Festival in Changsa, but that was nothing compared to this monstrosity.
http://shanghaiist.com/2013/11/12/photos_a_683_pound_giant_grouper_ca.php