Overview

Comprehensive Description

Biology

Found in schools, mainly along outer reef walls to moderate depths in pursuit of plankton (Ref. 48637).
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Distribution

Range Description

Naso caeruleacauda is found from the Philippines, Indonesia and the northern Great Barrier Reef, Australia. It was also recorded from northwest Madagascar (Allen 2005).
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Western Central Pacific: Philippines and Indonesia.
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West Pacific.
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Physical Description

Morphology

Dorsal spines (total): 45; Dorsal soft rays (total): 2830
  • Randall, J.E. 2001 Acanthuridae. Surgeonfishes (tangs, unicornfishes). p. 3653-3683. In K.E. Carpenter and V. Niem (eds.) FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Vol. 6. Bony fishes part 4 (Labridae to Latimeriidae), estuarine crocodiles. FAO, Rome. (Ref. 9808)   http://www.fishbase.org/references/FBRefSummary.php?id=9808&speccode=12625 External link.
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Size

Maximum size: 254 mm SL
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Max. size

40.0 cm SL (male/unsexed; (Ref. 48637))
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Diagnostic Description

No narrow dark bars on body. Caudal fin blue in life. Dorsal profile of head from above upper lip to above centre of eye straight. Anterior interorbital region and adjacent space between nostrils strongly convex. Body depth 2.75 to 2.8 times in SL (Ref 9808).
  • Randall, J.E. 2001 Acanthuridae. Surgeonfishes (tangs, unicornfishes). p. 3653-3683. In K.E. Carpenter and V. Niem (eds.) FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Vol. 6. Bony fishes part 4 (Labridae to Latimeriidae), estuarine crocodiles. FAO, Rome. (Ref. 9808)   http://www.fishbase.org/references/FBRefSummary.php?id=9808&speccode=12625 External link.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Naso caeruleacauda forms aggregations off seaward slopes, generally at depths greater than 15 m where it feeds on zooplankton. It sometimes swims in mixed schools with Naso hexacanthus.

Reproduction

The sexes are separate among the acanthurids. In Papua New Guinea, it is known to form spawning aggregations in open water above the reef every month of the year during the first and third quarter moon phase. It was reported to spawn early morning and late afternoon with group and pair spawning observed. N. caeruleacauda and N. caesisus are reported to aggregate bimonthly, just prior to the new and full moons. Several hundred species were observed to spawn (Hamilton et al. 2004).

Systems
  • Marine
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Environment

reef-associated; marine; depth range 20 - 25 m (Ref. 48637)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Naso caeruleacauda

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
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
Russell, B., Choat, J.H., Abesamis, R., Clements, K.D., McIlwain, J., Myers, R., Nanola, C., Rocha, L.A. & Stockwell, B.

Reviewer/s
Edgar, G. & Kulbicki, M.

Contributor/s

Justification
Naso caeruleacauda is widely distributed in the Coral Triangle Region. It occurs in moderately deep water. It is caught only incidentally in subsistence fisheries and there is no evidence of declines from harvesting. It is found in a number of marine reserves in the Coral Triangle. It is therefore listed as Least Concern.
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Population

Population
Naso caeruleocauda was recorded as occasional in terms of relative abundance in the northern Bismarck Sea, Papua New Guinea and in Raja Ampat, Indonesia (Allen 2009, 2003b). It is occasional in the Philippines (R. Abesamis, C. Nanola and B. Stockwell pers. comm. 2010). There was only one school recorded from northwest Madagascar (Allen 2005).

Population Trend
Stable
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Threats

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

Surgeonfishes show varying degrees of habitat preference and utilization of coral reef habitats, with some species spending the majority of their life stages on coral reef while others primarily utilize seagrass beds, mangroves, algal beds, and /or rocky reefs. The majority of surgeonfishes are exclusively found on coral reef habitat, and of these, approximately 80% are experiencing a greater than 30% loss of coral reef area and degradation of coral reef habitat quality across their distributions. However, more research is needed to understand the long-term effects of coral reef habitat loss and degradation on these species' populations. Widespread coral reef loss and declining habitat conditions are particularly worrying for species that recruit into areas with live coral cover, 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 (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. However, its distribution overlaps several marine protected areas within its range.
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Wikipedia

Naso caeruleacauda

The bluetail unicornfish, Naso caeruleacauda, is a tropical fish found in coral reefs around Indonesia and the Philippines.[1] It was first named by J.E. Randall in 1994,[1] and is also sometimes called the blue unicorn.[2]

References[edit]

  1. ^ a b Naso caeruleacauda at www.fishbase.org.
  2. ^ Common names for Naso caeruleacauda at www.fishbase.org.


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