Grouper

Groupers are large fish of the perch type.Oxford University Press, "Oxford Dictionary: 'grouper'" , Oxford English Dictionary, Retrieved 11 September 2014. They are genera in the subfamily Epinephelinae.

Groupers and the sea basses are in the family Serranidae. Most groupers are in one of two large genera: Epinephelus and Mycteroperca. Also, species in the small genera Anyperidon, Cromileptes, Dermatolepis, Gracila, Saloptia, and Triso are also called groupers.  Fish in the genus Plectropomus are referred to as coral groupers.  These genera are all in the subfamily Epiphelinae.  

Sometimes other fish have common names with the word "grouper".  Nonetheless, "grouper" on its own is usually taken to mean the subfamily Epinephelinae.

Groupers and octopuses often work together to catch prey on coral reefs.David Attenborough in Blue Planet II series 1:3 Coral Reefs. 

 References 

Category:Perciformes