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Overview

Comprehensive Description

Biology

Found around deep rocky reefs up to a depth of at least 30 m (Ref. 9710). Solitary or in small groups (Ref. 9710). Also caught with nets and other kinds of artisanal gear. Mainly sold fresh.
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Distribution

Range Description

This species is found in East Africa and the southwestern tropical Indian Ocean.
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Western Indian Ocean: known only from Natal (South Africa), Zanzibar (Tanzania), Madagascar, and Mauritius, but probably more widespread.
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Western Indian Ocean: East Africa and South Africa east to Madagascar and Mascarenes (Mauritius and Rodrigues).
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Physical Description

Size

Maximum size: 500 mm TL
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Max. size

50.0 cm TL (male/unsexed; (Ref. 5490))
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species inhabits outer reef slopes (Randall and Bruce 1983), and rich coral areas in depths between about 3-30 m (G. Allen and R.F. Myers pers comm. 2009).

Systems
  • Marine
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Environment

reef-associated; non-migratory; marine; depth range 5 - ? m (Ref. 9710)
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Depth range based on 1 specimen in 1 taxon.

Environmental ranges
  Depth range (m): 15 - 15
 
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Chlorurus cyanescens

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1
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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 is a large species with relatively restricted distribution. There are no reliable records of fishery or information on its biology. It is captured by subsistence fisheries but is unlikely to be heavily fished. It occurs in a number of marine protected areas in parts of its range. It is therefore listed as Least Concern.

History
  • 2010
    Least Concern
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Population

Population
This species is relatively rare. There are no abundance estimates or market records.

Population Trend
Unknown
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Threats

Major Threats
There are no major threats known for this species. Localized threats in Madagascar include habitat destruction by sedimentation and coral bleaching events (G. Allen pers comm. 2009).

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)
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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation measures in place for this species. It occurs in marine reserves in parts of its range.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: commercial; aquarium: commercial
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