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Overview

Comprehensive Description

Biology

Inhabits reef slopes (Ref. 9710). Feeds on benthic algae (Ref. 30573).
  • Randall, J.E. 1986 Red Sea reef fishes. London, Immel Publishing. 192 p. (Ref. 8883)
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Distribution

Range Description

This species is found only in the Red Sea and the Gulf of Aden.
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Western Indian Ocean: Red Sea and the Gulf of Aden.
  • Randall, J.E. 1986 Red Sea reef fishes. London, Immel Publishing. 192 p. (Ref. 8883)
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Gulf of Aden (northwestern Indian Ocean) and Red Sea.
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Physical Description

Size

Maximum size: 310 mm TL
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Max. size

31.0 cm TL (male/unsexed; (Ref. 8883))
  • Randall, J.E. 1986 Red Sea reef fishes. London, Immel Publishing. 192 p. (Ref. 8883)
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Type Information

Paratype for Chlorurus genazonatus
Catalog Number: USNM 223879
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): J. Randall
Year Collected: 1975
Locality: Red Sea; Gulf of Aqaba, Eilat, Off Desalination Plant, Israel, Red Sea, Indian
Depth (m): 15 to 15
  • Paratype: Randall, J. E. & Bruce, R. W. 1983. Ichthyological Bulletin of the J. L. B. Smith Institute of Ichthyology, Rhodes University, Grahamstown. No. 47: 19.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species is a small excavating parrot fish found on outer reef slopes. It inhabits coral reefs at depths between about 6-31 m, but most commonly encountered below 20 m (G. Allen pers comm. 2009). It has been observed to be solitary or in small groups to depths of 30 m.

Systems
  • Marine
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Environment

reef-associated; marine; depth range 6 - ? m (Ref. 9710), usually 20 - ? m (Ref. 9710)
  • Lieske, E. and R. Myers 1994 Collins Pocket Guide. Coral reef fishes. Indo-Pacific & Caribbean including the Red Sea. Haper Collins Publishers, 400 p. (Ref. 9710)
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Trophic Strategy

Inhabits reef slopes. Feeds on benthic algae.
  • Randall, J.E. 1986 Red Sea reef fishes. London, Immel Publishing. 192 p. (Ref. 8883)
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2012

Assessor/s
Choat, J.H., Carpenter, K.E., Clements, K.D., Rocha, L.A., Russell, B., Myers, R., Lazuardi, M.E., Muljadi, A., Pardede, S. & Rahardjo, P.

Reviewer/s
McIlwain, J. & Craig, M.T.

Contributor/s

Justification
This species is found only in the Red Sea but is not targeted due to small size and depth of occurrence. It occurs in marine reserves in parts of its range. It is therefore listed as Least Concern.

History
  • 2010
    Least Concern
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Population

Population
This endemic species is relatively rare in the Red Sea. In Duba, Saudi Arabia, an average of 33 individuals per hectare were recorded. It is more abundant in the northern Red Sea (Duba, Saudi Arabia as opposed to Jedda, Saudi Arabia) (A.M. Ayling pers comm. 2009).

Population Trend
Unknown
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Threats

Major Threats
There are no major threats known for this species.

Parrotfishes show varying degrees of habitat preference and utilization of coral reef habitats, with some species spending the majority of their life stages on coral reefs, while others primarily utilize seagrass beds, mangroves, algal beds, and /or rocky reefs. Although the majority of the parrotfishes occur in mixed habitat (primarily inhabiting seagrass beds, mangroves, and rocky reefs) approximately 78% of these mixed habitat species are experiencing greater than 30% loss of coral reef area and habitat quality across their distributions. Of those species that occur exclusively in coral reef habitat, more than 80% are experiencing a greater than 30% of coral reef loss and degradation across their distributions. However, more research is needed to understand the long-term effects of habitat loss and degradation on these species populations. Widespread coral reef loss and declining habitat conditions are particularly worrying for species that depend on live coral reefs for food and shelter especially as studies have shown that protection of pristine habitats facilitate the persistence of adult populations in species that have spatially separated adult and juvenile habitats. Furthermore, coral reef loss and declining habitat conditions are particularly worrying for some corallivorous excavating parrotfishes that play major roles in reef dynamics and sedimentation (Comeros-Raynal et al. 2012).
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Least Concern (LC)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation measures in place for this species. However, its distribution overlaps several marine protected areas within its range.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: minor commercial; price category: high; price reliability: very questionable: based on ex-vessel price for species in this family
  • Bruce, R.W. and J.E. Randall 1984 Scaridae. In W. Fischer and G. Bianchi (eds.) FAO species identification sheets for fishery purposes. (Western Indian Ocean fishing area 51). volume 3. [var. pag.] FAO, Rome. (Ref. 3488)
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