''Chlorurus gibbus'', the heavybeak parrotfish, gibbus parrotfish or Red Sea steephead parrotfish, is a species of marine

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

parrotfish Parrotfish (named for their mouths, which resemble a parrot's beak) are a clade of fish placed in the tribe Scarini of the wrasse family (Labridae). Traditionally treated as their own family (Scaridae), genetic studies have found them to be dee ...

from 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 ...

Scaridae. It is found in 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 ...

Taxonomy

''Chlorurus gibbus'' was first formally described as ''Scarus gibbus'' in 1829 by the

German German(s) may refer to: * Germany, the country of the Germans and German things **Germania (Roman era) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizenship in Germany, see also Ge ...

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 ...

and

explorer Exploration is the process of exploring, an activity which has some Expectation (epistemic), expectation of Discovery (observation), discovery. Organised exploration is largely a human activity, but exploratory activity is common to most organis ...

Eduard Rüppell Wilhelm Peter Eduard Simon Rüppell, also spelled Rueppell (20 November 1794 – 10 December 1884) was a German Natural history, naturalist and List of explorers, explorer, best known for his collections and descriptions of plants and animals from ...

(1794–1884), the type locality was given as Al Muwaylih,

Tabuk Province Tabuk Province, also known as Tabuk Region ( '), is a province in Saudi Arabia, located along the northwestern coast of the country, facing Egypt across the Red Sea. It also borders Jordan to the north. History The history of Tabuk province ...

in Saudi Arabia. When

William Swainson William Swainson Fellow of the Linnean Society, FLS, Fellow of the Royal Society, FRS (8 October 1789 – 6 December 1855), was an English ornithologist, Malacology, malacologist, Conchology, conchologist, entomologist and artist. Life Swains ...

created 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 ...

Chlorurus ''Chlorurus '' is a genus of parrotfish from the Indian and Pacific Oceans. Etymology The word ''Chlorurus'' comes from the Greek language, Greek words 'chloros', which means green and 'oura', which means tail. Evolution ''Chlorurus'' is mos ...

'' in 1839 he designated ''Scarus gibbus'' is its

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

. ''C. gibbus'' along with '' C. strongylocephalus'' in the Indian Ocean and '' C. microrhinos'' in the west-central Pacific form a

species complex In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily with each oth ...

Description

''Chlorurus gibbus'' is a large species of parrotfish which can attain a

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 ...

of and a weight of . The solitary juveniles are marked with longitudinal black and white stripes, the adults are blue in colour with a green and purple sheen in the males and a yellow sheen in the females.

Distribution

''Chlorurus gibbus'' is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to the

and the

Gulf of Aqaba The Gulf of Aqaba () or Gulf of Eilat () is a large gulf at the northern tip of the Red Sea, east of the Sinai Peninsula and west of the Arabian Peninsula. Its coastline is divided among four countries: Egypt, Israel, Jordan, and Saudi Arabia. ...

. It has not been recorded in the

Gulf of Aden The Gulf of Aden (; ) is a deepwater gulf of the Indian Ocean between Yemen to the north, the Arabian Sea to the east, Djibouti to the west, and the Guardafui Channel, the Socotra Archipelago, Puntland in Somalia and Somaliland to the south. ...

where the closely related species '' Chlorurus strongylocephalus'' has been recorded. A report of ''C. gibbus'' from

Socotra Socotra, locally known as Saqatri, is a Yemeni island in the Indian Ocean. Situated between the Guardafui Channel and the Arabian Sea, it lies near major shipping routes. Socotra is the largest of the six islands in the Socotra archipelago as ...

requires verification.

Habitat and biology

''Chlorurus gibbus'' occurs in shallow reefs and in nearby areas of sandy substrate in lagoons and bays at depths between . The adults school over the outer reef where there is an abundant growth of algae. They graze on filamentous algae. They have been recorded as attaining 14 years of age. They are

protogynous hermaphrodite Sequential hermaphroditism (called dichogamy in botany) is one of the two types of hermaphroditism, the other type being simultaneous hermaphroditism. It occurs when the organism's sex changes at some point in its life. A sequential hermaphrodite ...

s and have a social structure consisting of

harems A harem is a domestic space that is reserved for the women of the house in a Muslim family. A harem may house a man's wife or wives, their pre-pubescent male children, unmarried daughters, female domestic Domestic worker, servants, and other un ...

with a single dominant male. However, they are not

territorial A territory is an area of land, sea, or space, belonging or connected to a particular country, person, or animal. In international politics, a territory is usually a geographic area which has not been granted the powers of self-government, ...

and will live and feed alongside peaceably with other species. The teeth of parrotfish are fused together to form a powerful beak which they use to graze on filamentous algae growing on dead coral, often found feeding among a cloud of sediment. They are

oviparous Oviparous animals are animals that reproduce by depositing fertilized zygotes outside the body (i.e., by laying or spawning) in metabolically independent incubation organs known as eggs, which nurture the embryo into moving offsprings kno ...

and the male and female form a pair to

spawn Spawn or spawning may refer to: * Spawning, the eggs and sperm of aquatic animals Arts, entertainment and media * Spawn (character), a fictional character in the comic series of the same name and in the associated franchise ** ''Spawn: Armageddon' ...

. During the night they create a bag from mucus and bubbles which provides protection from nocturnal predators.

Relationship with humans

''Chlorurus gibbus'' is fished in the central Red Sea, in the

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 ...

fish market it was shown to be a significant part of the parrotfish catch.

References

{{Taxonbar, from=Q3499521 gibbus Taxa named by Eduard Rüppell Fish described in 1829