Facts about Greenfish (Thalassoma ascensionis)

Comprehensive Description

Biology

Littoral, near rocks and seagrass (Ref. 5292). Protogynous hermaphrodite, with distinct sexual dichromatism (Ref. 5292).

Gomon, M.F. and P. Forsyth 1990 Labridae. p. 868-882. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon, SEI, Paris; and UNESCO, Paris. Vol. 2. (Ref. 5292) http://www.fishbase.org/references/FBRefSummary.php?id=5292&speccode=7633

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Distribution

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Eastern Atlantic: Ascension Island and St. Helena. Reported from São Tomé Island (Ref. 34088).

Gomon, M.F. and P. Forsyth 1990 Labridae. p. 868-882. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon, SEI, Paris; and UNESCO, Paris. Vol. 2. (Ref. 5292) http://www.fishbase.org/references/FBRefSummary.php?id=5292&speccode=7633

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Range Description

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This species is present in the tropical east-central Atlantic only around Ascension Island.

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Eastern Atlantic.

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Size

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Maximum size: 100 mm SL

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Max. size

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10.0 cm SL (male/unsexed; (Ref. 5292))

Gomon, M.F. and P. Forsyth 1990 Labridae. p. 868-882. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon, SEI, Paris; and UNESCO, Paris. Vol. 2. (Ref. 5292) http://www.fishbase.org/references/FBRefSummary.php?id=5292&speccode=7633

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Habitat

Environment

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reef-associated; marine; depth range 1 - 30 m (Ref. 5292)

Gomon, M.F. and P. Forsyth 1990 Labridae. p. 868-882. In J.C. Quero, J.C. Hureau, C. Karrer, A. Post and L. Saldanha (eds.) Check-list of the fishes of the eastern tropical Atlantic (CLOFETA). JNICT, Lisbon, SEI, Paris; and UNESCO, Paris. Vol. 2. (Ref. 5292) http://www.fishbase.org/references/FBRefSummary.php?id=5292&speccode=7633

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Habitat and Ecology

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Habitat and Ecology

This species is generally reef associated, inhabiting shallow insular waters around rocky shores and rocky reefs to depths of 30 m, and also in seagrass beds (Gomon and Forsyth 1990).

Like its eastern Atlantic congeners, it probably feeds on small benthic invertebrates. It is a protogynous hermaphrodite, and shows distinct sexual dichromatism (Gomon and Forsyth 1990). Its eggs and larvae are planktonic.

Systems

Marine

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Depth: 1 - 30m.
From 1 to 30 meters.

Habitat: demersal.

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Molecular Biology

Statistics of barcoding coverage: Thalassoma ascensionis

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Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 9
Species With Barcodes: 1

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Conservation Status

IUCN Red List Assessment

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Red List Category

DD

Data Deficient

Red List Criteria

Version

3.1

Year Assessed

2010

Assessor/s

Pollard, D.

Reviewer/s

Craig, M.T. & Carpenter, K.E.

Contributor/s

Justification

This species is only known from Ascension Island and is abundant. However, more research is needed to determine any major threats for this species, given its very restricted range. It is listed as Data Deficient.

History