Emperor angelfish

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At Reunion Island
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Scientific classification Edit this classification
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Binomial name
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(Bloch, 1787)
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Synonyms[1]
List
    • Chaetodon imperator Bloch, 1787
    • Acanthochaetodon imperator (Bloch, 1787)
    • Holacanthus imperator (Bloch, 1787)
    • Pomacanthodes imperator (Bloch, 1787)
    • Chaetodon nicobariensis Bloch & Schneider, 1801
    • Acanthochaetodon nicobariensis (Bloch & Schneider, 1801)
    • Holacanthus nicobariensis (Bloch & Schneider, 1801)
    • Pomacanthus nicobariensis (Bloch & Schneider, 1801)

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The emperor angelfish (Pomacanthus imperator) is a species of marine angelfish. It is a reef-associated fish, native to the Indian and Pacific Oceans, from the Red Sea to Hawaii and the Austral Islands. This species is generally associated with stable populations and faces no major threats of extinction.[2] It is a favorite of photographers, artists, and aquarists because of its unique, brilliant pattern of coloration.[citation needed]

Taxonomy

The emperor angelfish was first formally described in 1787 as Chaetodon imperator by the German physician and naturalist Marcus Elieser Bloch (1723–1799) with the type locality given as Japan.[3] Some authorities place this species in the subgenus Acanthochaetodon. The specific name imperator means "emperor" and reflects the Dutch name Keyser van Iapan meaning "Emperor of Japan" coined by the publisher Louis Renard (ca. 1678–1746) in 1719, possibly reflecting its majestic appearance.[4]

Distribution

The emperor angelfish has a wide Indo-Pacific distribution. It occurs from the Red Sea southwards along the East African coast to Mozambique and Madagascar, eastwards through the Indian and Pacific Oceans as far as the Tuamotu Islands and the Line Islands. It extends north to the Kansai region and to the southern regions of Japan and south to the Great Barrier Reef of Australia, New Caledonia and the Austral Islands in French Polynesia. Vagrants have been recorded from Hawaii.[2] It has been recorded at several sites off the coast of Florida and off Puerto Rico,[5] and since 2009 as a Lessepsian migrant to the eastern Mediterranean basin where it now found in low numbers in a number of localities.[6][7]

Description

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File:Pez ángel emperador (Pomacanthus imperator), islas Ad Dimaniyat, Omán, 2024-08-14, DD 47.jpg
File:Emperor Angelfish, , , imported from iNaturalist photo 167963377 (cropped).jpg
File:Emperor angelfish (Pomacanthus imperator) (32827796637).jpg
From juvenile (left) to adult (right)

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File:Emperor angelfish (Pomacanthus imperator).jpg
In Indonesia, with dorsal filament
File:Pez ángel emperador (Pomacanthus imperator), mar Rojo, Egipto, 2023-04-17, DD 104.jpg
In the Red Sea, without dorsal filament

The emperor angelfish shows a marked difference between the juveniles and the adults. The juveniles have a dark blue body which is marked with concentric curving lines, alternating between pale blue and white with the smallest which are completely enclosed within each other located posteriorly. These lines become vertical at the anterior end.[8] The dorsal fin has a white margin and the caudal fin is transparent.[5] The adults are striped with blue and yellow horizontal stripes, a light blue face with a dark blue mask over the eyes and a yellow caudal fin. There is a blackish band above the pectoral fins, the top of which is at the level of the upper orbit. The front margin of this band is bright blue and the rear margin is a thin yellow line.[8] The anal fin has a dark blue background with lighter blue horizontal stripes.[5]

The dorsal fin has 13–14 spines and 17–21 soft rays while the anal fin has 3 spines and 18–21 soft rays. This species attains a maximum total length of Template:Cvt.[1]

Adult individuals of the Pacific Ocean population sport a filament trailing from the rear of the dorsal fin, while this is absent in the Indian Ocean population.[9]

Habitat

The emperor angelfish is found at depths between 1 and 100 metres (3.3 and 328.1 ft).[2] The adults are found in areas where there is a rich growth of corals on clear lagoon, channel, or seaward reefs. Here they are normally observed underneath ledges and within caves. The subadults are frequently recorded in cavities in reefs and along surge channels on seaward reefs. The juveniles frequently shelter below ledges, in reef cavities and in relatively sheltered areas in channels and over outer reef flats.[10]

Biology

Its diet comprises sponges and other encrusting organisms, as well as tunicates. They form pairs. The juveniles and adults may act as cleaner fish, cleaning ectoparasites off larger fishes.[1] When frightened, these fish can produce a knocking sound.[5]

Utilisation

The emperor angelfish is common in the aquarium trade.[2]

References

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Wikispecies has information related to Pomacanthus imperator.

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  1. ^ a b c Script error: No such module "Cite taxon".
  2. ^ a b c d e Template:Cite iucn
  3. ^ Template:Cof genus
  4. ^ Page Module:Citation/CS1/styles.css has no content.Christopher Scharpf & Kenneth J. Lazara (21 July 2020). "Order ACANTHURIFORMES (part 1): Families LOBOTIDAE, POMACANTHIDAE, DREPANEIDAE and CHAETODONTIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf and Kenneth J. Lazara. Retrieved 28 February 2021.
  5. ^ a b c d Page Module:Citation/CS1/styles.css has no content."Pomacanthus imperator (Bloch, 1787)". Nonindigenous Aquatic Species. USGS. Retrieved 28 February 2021.
  6. ^ Atlas of Exotic Fishes in the Mediterranean Sea (Pomacanthus imperator). 2nd Edition. 2021. 366p. CIESM Publishers, Paris, Monaco.https://ciesm.org/atlas/fishes_2nd_edition/Pomacanthus_imperator.pdf
  7. ^ Page Module:Citation/CS1/styles.css has no content.Daniel Golani; Oren Sonin; Dor Edelist (2011). "Second records of the Lessepsian fish migrants Priacanthus sagittarius and Platax teira and distribution extension of Tylerius spinosissimus in the Mediterranean". Aquatic Invasions. 6 (1, supplement): s7–s11 (specific ref page s9). doi:10.3391/ai.2011.6.S1.002.
  8. ^ a b Page Module:Citation/CS1/styles.css has no content."Pomacanthus imperator". Saltcorner!. Bob Goemans. 2012. Retrieved 1 March 2021.
  9. ^ Page Module:Citation/CS1/styles.css has no content.Ye, Jeng-Jia; Shen, Kang-Ning; Chen, Ching-Hung; Hsiao, Chung-Der; Chang, Chih-Wei (2016-11-01). "The complete mitochondrial genome of the Emperor angelfish, Pomacanthus imperator (Perciformes: Pomacanthidae)". Mitochondrial DNA Part A. 27 (6): 4126–4127. doi:10.3109/19401736.2014.1003875. ISSN 2470-1394. PMID 25585498.
  10. ^ Page Module:Citation/CS1/styles.css has no content.Dianne J. Bray. "Pomacanthus imperator". Fishes of Australia. Museums Victoria. Retrieved 1 March 2021.

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