Grouper
Groupers are large, stout-bodied fish important as food and game.
Groupers are marine ray-finned fish belonging to the family Epinephelidae, within the order Perciformes. For a long time, they were classified as a subfamily of the seabasses (Serranidae), but scientists now consider them a separate family. The term "grouper" typically refers to species in the two large genera *Epinephelus* and *Mycteroperca*, but it also applies to fish in smaller genera such as *Anyperidon*, *Chromileptes*, *Dermatolepis*, *Graciela*, *Saloptia*, and *Triso*. Those in the genus *Plectropomus* are called "coral groupers." All these genera fall under the subfamily Epinephelinae. However, this subfamily also includes hamlets (*Alphestes*), hinds (*Cephalopholis*), lyretails (*Variola*), and a few other small genera (*Gonioplectrus*, *Niphon*, *Paranthias*). Occasionally, species from other serranid genera have common names that include the word "grouper." Still, when used alone, "grouper" is generally understood to mean the family Epinephelidae.
**Description** Groupers are teleosts with a stout body and a large mouth, not built for fast, long-distance swimming. They can grow quite large—over a meter in length. The Atlantic goliath grouper (*Epinephelus itajara*) is the biggest, recorded at 399 kilograms (880 pounds) and 2.43 meters (7 feet 11½ inches), though sizes vary widely across the group. Rather than biting off pieces, they swallow their prey whole. Their jaw edges have few teeth, but they possess heavy crushing tooth plates inside the pharynx. Their diet typically includes fish, octopuses, and crustaceans. Some species ambush prey, while others actively hunt. Reports of fatal attacks on humans by the largest species, like the giant grouper (*Epinephelus lanceolatus*), remain unconfirmed. Their mouths and gills create a powerful vacuum that pulls prey in from a distance. They also use their mouths to dig shelters under large rocks, expelling sand through their gills. Research shows that roving coralgroupers (*Plectropomus pessuliferus*) sometimes cooperate with giant morays while hunting. Groupers are also among the few animals that eat invasive red lionfish.
**Systematics**
**Etymology** The word "grouper" comes from the Portuguese *garoupa*, which may trace back to an indigenous South American language.
Quick Facts
- Taxon
- Epinephelidae
Facts from the source article.
Lore & Background
Groupers are teleosts with a stout body and large mouth, not built for fast, long-distance swimming. They can be quite large, over a meter in length; the largest is the Atlantic goliath grouper, weighed at 399 kilograms and 2.43 meters long. They swallow prey whole rather than biting pieces, using heavy crushing tooth plates inside the pharynx, and their mouths and gills create a powerful vacuum to pull in prey. They habitually eat fish, octopuses, and crustaceans; some ambush prey, while others are active predators. Reports of fatal attacks on humans by the largest species are unconfirmed. Research indicates roving coralgroupers sometimes cooperate with giant morays in hunting, and groupers are one of the only animals that eat invasive red lionfish.
Reader's Guide
Groupers are important food fish, with many species farmed and usually sold alive in markets. They are popular game fish for big-game fishing, and some small species are kept in aquaria, though they grow rapidly. Groupers are commonly reported as a source of ciguatera fish poisoning; DNA barcoding might help control this by identifying fish from meal remnants. The word 'grouper' comes from the Portuguese 'garoupa', possibly from an indigenous South American language. The family name Epinephelidae means 'clouded over' in ancient Greek, referencing the cloudy membrane covering the eyes of most groupers. In Australia, 'groper' is used for several species; in New Zealand, 'groper' refers to a wreckfish called hapuka. In the Philippines, groupers are known as lapu-lapu in Luzon and pugapo in the Visayas and Mindanao; in Indonesia and Malaysia as kerapu; in the Middle East as hammour; and in Latin America as mero. Groupers are mostly protogynous hermaphrodites, maturing as females and changing sex after maturity, though some are gonochoristic, a strategy that evolved independently at least five times.
The Taxonomic Puzzle Behind One Common Name
Sea bass is not a single species but an umbrella common name applied to fish spanning multiple families, genera, and even different orders. Within the suborder Percoidei alone, the label covers members of Serranidae (rock basses, Atlantic dwarf sea basses, pygmy sea bass), Anthiadidae (fairy basslets and streamer basses), and Epinephelidae (the groupers). Beyond Percoidei, the term stretches into the order Acropmatiformes, encompassing Lates perches, Moronidae (European and striped sea basses), Stereolepididae (giant sea bass), Lateolabracidae (Japanese sea basses), Malakichthyidae, and Ostracoberycidae. Families outside both orders—Sciaenidae (drums and croakers) and Nototheniidae (cod icefishes)—also contribute species marketed under the sea bass label. In Ireland and the United Kingdom, the term is restricted exclusively to the European seabass or Branzino, though the closely related spotted seabass may also qualify. This sprawling usage means two fish both called sea bass at a market stall could be separated by vast evolutionary distance.
The Grouper Family and Its Reef Dwellers
Within the family Epinephelidae, commonly known as the groupers, several species carry the sea bass name. The genus Epinephelus includes the potato cod (also called potato bass or potato grouper), a large reef fish inhabiting the Indian and Pacific Oceans, alongside the dusky grouper and the dogtooth grouper. The genus Cephalopholis, referred to as hinds, contributes the vermilion sea bass (or coral grouper), the blue-spotted sea bass, and the tomato seabass (also known as tomato hind or tomato grouper). The lyretails, genus Variola, add the moontail sea bass, chameleon sea bass, or yellow-edged lyretail. These reef-dwelling fish represent a distinct branch of the sea bass nomenclature, separate from the more familiar European or Japanese sea basses. Their association with coral reef ecosystems in tropical and subtropical waters sets them apart from the temperate species that dominate commercial fisheries in Europe and North America.
Commercial Fisheries and the Politics of a Name
The commercial and culinary landscape of sea bass is shaped by regional traditions and marketing choices. In Ireland and the United Kingdom, the fish sold as sea bass is exclusively the European seabass (Dicentrarchus labrax), also known as Branzino or sea dace, which holds major importance in aquaculture. The closely related spotted seabass (Dicentrarchus punctatus) may also be included. In Japanese, Korean, and Chinese cuisines, the Japanese sea basses of the genus Lateolabrax, commonly called suzuki, are staples of the kitchen. A striking example of marketing nomenclature is the Patagonian toothfish (Dissostichus eleginoides) and the Antarctic toothfish (Dissostichus mawsoni), both cod icefishes from Nototheniidae, sold commercially as Chilean sea bass despite having no true relation to the European or Japanese sea basses. Hybrid striped bass, a cross between Morone chrysops and M. saxatilis known as the wiper, may also enter commerce as hybrid seabass.
From Tropical Reefs to Polar Waters
The species collectively called sea bass occupy an extraordinary range of marine environments. Reef fish such as the potato cod and the various hinds and lyretails thrive in the warm waters of the Indian and Pacific Oceans. The giant sea bass (Stereolepis gigas), which can exceed 225 kilograms, patrols the cold currents off California and Baja California. In the eastern Indian Ocean and the southwest Pacific, including southern Australia and New Zealand, the butterfly perch and pink maomao add to the regional fauna. The striped giant sea bass and the spinycheek seabass extend the range further into Pacific waters. At the opposite extreme of the thermal spectrum, the Patagonian and Antarctic toothfishes inhabit the frigid Southern Ocean. Along the Pacific coast of the United States, the white seabass, a member of the drum and croaker family, completes a picture in which the single common name sea bass bridges tropical reefs, temperate coasts, and polar waters.
Frequently Asked Questions
What is a grouper?
Groupers are large, stout-bodied marine fish in the family Epinephelidae (order Perciformes), a name most commonly applied to species in the genera Epinephelus and Mycteroperca. They are widely valued as both a food source and a popular game fish.
What is the largest grouper species?
The Atlantic goliath grouper (Epinephelus itajara) is the biggest, with a maximum documented length of 2.43 m and a top weight of 399 kg.
How do groupers reproduce?
Many grouper species are protogynous hermaphrodites, meaning individuals begin life as females and can later transition to males. In those species the testicular tissue accounts for roughly 1 percent of total gonad mass, a small proportion that reflects the sex-reversal biology.
Are groupers a type of sea bass?
Not under current taxonomy—groupers were once treated as a subfamily of the seabasses (Serranidae), but scientists now recognize them as a separate family, Epinephelidae. They still share the broader order Perciformes with true sea basses, which is why the old grouping persisted in common usage.
How fast do groupers grow?
On average a grouper gains about 1 kg per year, and females generally reach sexual maturity at around 3 kg. This slow growth rate makes wild populations particularly vulnerable to overfishing.
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