The redmouth grouper (''Aethaloperca rogaa''), also known as the red-flushed rock cod is a species of

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

, a

grouper Groupers are a diverse group of marine ray-finned fish in the family Epinephelidae, in the order Perciformes. Groupers were long considered a subfamily of the seabasses in Serranidae, but are now treated as distinct. Not all members of this f ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Epinephelidae Groupers are a diverse group of marine ray-finned fish in the family Epinephelidae, in the order Perciformes. Groupers were long considered a subfamily of the seabasses in Serranidae, but are now treated as distinct. Not all members of this f ...

. It has a wide distribution in the Indian and Pacific Oceans. It is considered a game fish.

Description

The redmouth grouper is laterally compress and oval shaped with a relatively deep body which is around half of the

standard length Fish measurement is the measuring of individual fish and various parts of fish anatomy, their anatomies, for data used in many areas of ichthyology, including Taxonomy (biology), taxonomy and fishery biology. Overall length Standard length (SL) is ...

and a large head. The dorsal profile of the head is straight or slightly concave while the anterior dorsal profile between the eye and the origin of the

dorsal fin A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous. They are found ...

is convex. It jaw extends past its eye. The dorsal fin has 9 spines and 17-18 soft rays while the

anal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported o ...

has 3 spines and 8-9 soft rays. The middle soft rays of the dorsal and anal fins are elongated in the adults which results in them having an angular profile. They have a

caudal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only ...

which is truncate and asymmetrical

pectoral fins Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only b ...

. The

pelvic fins Pelvic fins or ventral fins are paired fins located on the ventral (belly) surface of fish, and are the lower of the only two sets of paired fins (the other being the laterally positioned pectoral fins). The pelvic fins are homologous to the hi ...

extend beyond the anus. The colour is dark brown to black, sometimes tinged with orange and a pale vertical bar on the lower flank. The rear part of the spiny portion of the dorsal fin varies in colour from dark orange to brownish red. The oral cavity, gill cavity, and upper jaw membranes are reddish to orange, thus the common name. The juveniles have a wide white rear margin to the caudal fin and a thin white margin along the soft-rayed portion of the dorsal fin. The maximum

total length Fish measurement is the measuring of individual fish and various parts of their anatomies, for data used in many areas of ichthyology, including taxonomy and fishery biology. Overall length Standard length (SL) is the length of a fish measured f ...

is .

Distribution

The redmouth grouper has an

Indo-West Pacific The Indo-Pacific is a vast biogeographic region of Earth. In a narrow sense, sometimes known as the Indo-West Pacific or Indo-Pacific Asia, it comprises the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the s ...

distribution which extends from the

Red Sea The Red Sea is a sea inlet of the Indian Ocean, lying between Africa and Asia. Its connection to the ocean is in the south, through the Bab-el-Mandeb Strait and the Gulf of Aden. To its north lie the Sinai Peninsula, the Gulf of Aqaba, and th ...

and

Persian Gulf The Persian Gulf, sometimes called the Arabian Gulf, is a Mediterranean seas, mediterranean sea in West Asia. The body of water is an extension of the Arabian Sea and the larger Indian Ocean located between Iran and the Arabian Peninsula.Un ...

south along the East African court to South Africa, east to the

Phoenix Islands The Phoenix Islands, or Rawaki, are a group of eight atolls and two submerged coral reefs that lie east of the Gilbert Islands and west of the Line Islands in the central Pacific Ocean, north of Samoa. They are part of the Kiribati, Republic ...

in Kiribati, and north to southern

Honshu , historically known as , is the largest of the four main islands of Japan. It lies between the Pacific Ocean (east) and the Sea of Japan (west). It is the list of islands by area, seventh-largest island in the world, and the list of islands by ...

, Japan. In Australia it has been recorded from

Rowley Shoals The Rowley Shoals is a group of three atoll-like coral reefs south of the Timor Sea, about west of Broome on the northwestern Australian coast, centred on , on the edge of one of the widest continental shelves in the world. Each atoll covers a ...

and the

Kimberley Kimberly or Kimberley may refer to: Places and historical events Australia Queensland * Kimberley, Queensland, a coastal locality in the Shire of Douglas South Australia * County of Kimberley, a cadastral unit in South Australia Ta ...

region in

Western Australia Western Australia (WA) is the westernmost state of Australia. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to the south, the Northern Territory to the north-east, and South Australia to the south-east. Western Aust ...

Ashmore Reef The Territory of Ashmore and Cartier Islands is an uninhabited Australian external territory consisting of four low-lying tropical islands in two separate reefs (Ashmore and Cartier), as well as the territorial sea generated by the islands ...

, the

Timor Sea The Timor Sea (, , or ) is a relatively shallow sea in the Indian Ocean bounded to the north by the island of Timor with Timor-Leste to the north, Indonesia to the northwest, Arafura Sea to the east, and to the south by Australia. The Sunda Tr ...

, and the northern

Great Barrier Reef The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching for over over an area of approximately . The reef is located in the Coral Sea, off the coast of Queensland, ...

as far south as

Wheeler Reef Wheeler may refer to: Places United States * Wheeler, Alabama, an unincorporated community * Wheeler, Arkansas, an unincorporated community * Wheeler, California, an unincorporated community * Wheeler, Illinois, a village * Wheeler, Indiana, a c ...

Queensland Queensland ( , commonly abbreviated as Qld) is a States and territories of Australia, state in northeastern Australia, and is the second-largest and third-most populous state in Australia. It is bordered by the Northern Territory, South Austr ...

. This species is likely found around all the tropical islands of the Indian Ocean, although it has not been reported from Mauritius yet. It has been recorded from

Europa Island Europa Island (, ), in Malagasy Nosy Ampela is a low-lying tropical atoll in the Mozambique Channel, about a third of the way from southern Madagascar to southern Mozambique. The island had never been inhabited until 1820, when the French fa ...

in the

Mozambique Channel The Mozambique Channel (, , ) is an arm of the Indian Ocean located between the Southeast African countries of Madagascar and Mozambique. The channel is about long and across at its narrowest point, and reaches a depth of about off the coa ...

Biology and habitat

The redmouth grouper is a tropical fish which occurs in coastal reefs and lagoons, it has been recorded over silt substrates as well as in and around caves and crevices in reefs. It has a depth range of . The small juveniles mimic angelfish of the genus ''

Centropyge ''Centropyge'' is a genus of ray-finned fish, marine angelfish belonging to the family (biology), family Pomacanthidae found in the Atlantic Ocean, Atlantic, Indian Ocean, Indian and Pacific Ocean. These species do not exceed 15 centimeter, cm in ...

''. This is a predatory species which mainly feeds on small fishes, including ''

Pempheris ''Pempheris'' is a genus of sweepers native to the Atlantic, Indian and Pacific Ocean. Species There are currently more than 70 recognized species in this genus: * '' Pempheris adspersa'' Griffin, 1927 (New Zealand bigeye) * '' Pempheris adusta ...

'' spp., but also on

stomatopod Mantis shrimp are carnivorous marine crustaceans of the order Stomatopoda (). Stomatopods branched off from other members of the class Malacostraca around 400 million years ago, with more than 520 extant species of mantis shrimp known. All li ...

s and

crustacean Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthrop ...

s. The redmouth grouper spawns throughout the year and attains sexual maturity at around in standard length, although they have not been reported to form spawning aggregations.

Uses

The redmouth grouper is probably caught by line and spear fisheries throughout its range, although it is not a target species and is normally considered to be of low value. It has been recorded being taken by line fisheries in the

Solomon Islands Solomon Islands, also known simply as the Solomons,John Prados, ''Islands of Destiny'', Dutton Caliber, 2012, p,20 and passim is an island country consisting of six major islands and over 1000 smaller islands in Melanesia, part of Oceania, t ...

Micronesia Micronesia (, ) is a subregion of Oceania, consisting of approximately 2,000 small islands in the Northwestern Pacific Ocean. It has a close shared cultural history with three other island regions: Maritime Southeast Asia to the west, Poly ...

, the

Maldives The Maldives, officially the Republic of Maldives, and historically known as the Maldive Islands, is an Archipelagic state, archipelagic country in South Asia located in the Indian Ocean. The Maldives is southwest of Sri Lanka and India, abou ...

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

and

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

. It is rarely sold in markets, although it has been stated that it is an important component of the fresh-chilled grouper fishery in the Maldives.

Taxonomy

The redmouth grouper was first formally described by the

Swedish Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by ...

naturalist Natural history is a domain of inquiry involving organisms, including animals, fungi, and plants, in their natural environment, leaning more towards observational than experimental methods of study. A person who studies natural history is cal ...

Peter Forsskål Peter Forsskål, sometimes spelled Pehr Forsskål, Peter Forskaol, Petrus Forskål or Pehr Forsskåhl (11 January 1732 – 11 July 1763) was a Sweden, Swedish exploration, explorer, oriental studies, orientalist, natural history, naturalist, and ...

(1732-1763) as ''Perca rogaa'' with the type locality given as

Jeddah Jeddah ( ), alternatively transliterated as Jedda, Jiddah or Jidda ( ; , ), is a List of governorates of Saudi Arabia, governorate and the largest city in Mecca Province, Saudi Arabia, and the country's second largest city after Riyadh, located ...

. The description was published by

Carsten Niebuhr Carsten Niebuhr, or Karsten Niebuhr (17 March 1733 Cuxhaven, Lüdingworth – 26 April 1815 Meldorf, Dithmarschen), was a German mathematician, Cartography, cartographer, and Geographical exploration, explorer in the service of Denmark-Norway. He ...

in 1775 from filed notes edited by

Johann Christian Fabricius Johann Christian Fabricius (7 January 1745 – 3 March 1808) was a Danish zoologist, specialising in "Insecta", which at that time included all arthropods: insects, arachnids, crustaceans and others. He was a student of Carl Linnaeus, and is cons ...

and so the name is sometimes written as ''Perca rogaa'' Fabricius (ex Forsskål) in Niebuhr 1775. Some authorities place the redmouth grouper as the only species in the

monospecific In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

genus ''

Aethaloperca The redmouth grouper (''Aethaloperca rogaa''), also known as the red-flushed rock cod is a species of ray-finned fish, a grouper in the family Epinephelidae. It has a wide distribution in the Indian and Pacific Oceans. It is considered a game f ...

'' which was created in 1904 by the

American American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, p ...

ichthyologist Ichthyology is the branch of zoology devoted to the study of fish, including bony fish (Osteichthyes), cartilaginous fish (Chondrichthyes), and jawless fish (Agnatha). According to FishBase, 35,800 species of fish had been described as of March 2 ...

Henry Weed Fowler Henry Weed Fowler (March 23, 1878 – June 21, 1965) was an American zoologist born in Holmesburg, Philadelphia, Holmesburg, Pennsylvania. He studied at Stanford University under David Starr Jordan. He joined the Academy of Natural Sciences in Ph ...

as a subgenus of ''

Bodianus ''Bodianus'' is a genus of fish in the family of wrasses, the Labridae, which are commonly known as hogfishes. They are found in the Atlantic, Indian and Pacific Ocean. These species have many parasites. Taxonomy ''Bodianus'' belongs to ...

''. Recent molecular analyses challenge the placement of this species in the genus ''Aethaloperca''. In a study based on five different genes, it was included in the '' Cephalopholis'' clade, thus suggesting that the species should be included in the

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

'' Cephalopholis'' and referred to as ''Cephalopholis rogaa''.

References

External links

* {{Taxonbar, from=Q338003 Epinephelini Fish of the Indian Ocean Fish of the Pacific Ocean Fish of Thailand Fish described in 1775 Taxa named by Peter Forsskål