Adult grouper are usually 20 to 30 centimeters in length. Different species, the size is slightly different. Such as red spot grouper body length of 340 ~ 400 mm, oblique banded grouper female fish full-length 25 ~ 30 cm when mature (2 or 3 age fish), and sexual transformation often occurs in the 55 ~ 75 cm body length. the afternoon of November 9, 2013, a length of 2.65 meters, weighing 683 pounds of giant grouper appeared in the town of Dalang, Dongguan, the grouper, a breakthrough in Guinness Book of Records, is known as the king of grouper.