Tag Archive: unicornfishes


TAXONOMY
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii (ray-finned fishes)
Order: Perciformes (Perch-likes)
Family: Acanthuridae (Surgeonfishes, tangs, unicornfishes)

Genus/species: Naso lituratus

IMG_5124

Photo above Male

 

GENERAL CHARACTERISTICS: The Orange Spine Unicornfish is a hornless unicornfish. Coloration varies among populations. A prominent vertical black stripe from eyes to mouth is present on its face. The continuous unnotched dorsal fin is black with with a pale blue line at base and a broad outer white zone. The anal fin is orange.  The bright orange caudal peduncule has two forward-directed venomous knife-like keeled bony plates.   The caudal fin is emarginate (slight inward curve) with adult males having trailing filaments from each corner.

Length to 46 cm (18 inches)

DISTRIBUTION/HABITAT: Indo-Pacific over coral, rock or rubble of lagoon and seaward reefs from the lower surge zone to 90 m (300 ft). Introduced Florida and Georgia.

DIET IN THE WILD: Primarily leafy brown algae especially Sargassum spp.

REPRODUCTION: Fertilization is external with open water pair spawning. Nonguarders

CONSERVATION: IUCN Least Concern (LC)

References

California Academy of Sciences Steinhart Aquarium Philippine Coral Reef 2016

Rons flickr http://www.flickr.com/photos/cas_docents/2979734770/in/set 72157608332652056

Ron’s WordPress Shortlink   http://wp.me/p1DZ4b-HQ

fishbase  http://www.fishbase.org/summary/1264

USGS  http://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=2553

IUCN www.iucnredlist.org/details/177950/0

TAXONOMY

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii (ray-finned fishes)
Order: Perciformes (Perch-likes)
Family: Acanthuridae  (Surgeonfishes, tangs, unicornfishes)

Genus/Species: Naso vlamingii

GENERAL CHARACTERISTICS: The Bignose Unicornfish has a convexly rounded prominent snout and extremely tall dorsal and anal fins. A broad blue band extends from eye to front of rostral protuberance. The body is gray, ovate and compressed with blue vertical lines which break up into small blue spots dorsally and ventrally. The tips of the tail fin are unusually long.

Length to 60 cm (23 in)

DISTRIBUTION/HABITAT: Found in the Indo-Pacific in deep lagoons and seaward reefs from 4–50 m (12-150 ft) off steep slopes.

DIET IN THE WILD: Omnivorous, feeds on zooplankton.

REPRODUCTION: External fertilization. Egg scatterers, non-guarding. Remarks: Courting males are able to instantaneously turn iridescent blue.

CONSERVATION: IUCN Least concern (LC)

References

California Academy of Sciences Steinhart Aquarium Philippine Coral Reef 2016

fishbase  www.fishbase.org/summary/6024

EOL eol.org/pages/213847/hierarchy_entries/44696490/details

Ron’s flickr http://www.flickr.com/photos/cas_docents/sets/72157608332652056/with/3120136472/

Ron’s WordPress Shortlink  http://wp.me/p1DZ4b-HF

TAXONOMY
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Acanthuridae (Surgeonfishes, Tangs and Unicornfishes)

Genus/species: Naso unicornis

GENERAL CHARACTERISTICS: Naso unicornis is gray to olive with blue tail spines.  The short forehead horn does not project past mouth. The peduncular plates and spines are blue; dorsal and anal fins yellowish with narrow blue stripes. Adult males tend be larger and have a better developed horn, peduncular spines, and caudal filaments than females.

Length to 70 cm (27.5 in)

DISTRIBUTION/HABITAT: Indo-Pacific. The Bluespine Unicornfish inhabits channels, moats, lagoons and seaward reefs with strong surge. It typically occurs  in small groups at depths of 1–80 m (3-250 ft.).

DIET IN THE WILD: It is diurnal feeding on macro- and micr oalgae, including brown algae like Sargassum.

REPRODUCTION: External fertilization. Pair-spawning has been observed; pelagic larvae.

PREDATORS: An important food fish on most tropical islands. Long-lived, up to 35
years. Preyed upon by other fishes.

CONSERVATION: IUCN; least concern.

REMARKS: Rostral horn responsible for species’ common name. Surgeonfishes have a single scalpel-like peduncular spine which folds into a groove while unicornfishes have 1 or 2 sharp, fixed keel-like peduncular plates. The spines are used offensively and defensively.

References

California Academy of Sciences Steinhart Aquarium Philippine Coral Reef 2016

Ron’s flickr http://www.flickr.com/photos/cas_docents/sets/72157608332652056/with/3185901763/

Ron’s WordPress shortlink http://wp.me/p1DZ4b-Hx

fishbase http://www.fishbase.org/summary/1265

EOL  http://eol.org/pages/213498/details

TAXONOMY
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii (ray-finned fishes)
Order: Perciformes (Perch-likes)
Family: Acanthuridae (Surgeonfishes, tangs, unicornfishes)

Genus/species: Naso brevirostris

GENERAL CHARACTERISTICS: The Spotted Unicornfish is olive-brown to blue-grey with dark spots on head and vertical rows of spots and lines on sides. The tail is whitish with a dark area at base. A long, tapering horn on forehead of adults is lacking in juveniles.

Max length: 60 cm (23.5 in)

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DISTRIBUTION/HABITAT: Naso brevirostris is found in the Indo-Pacific: East Africa, the Hawaiian Islands, southern Japan and Australia  It prefers mid-waters along steep outer lagoon and seaward reef drop-offs, from 4–45 m (12-150 ft).

DIET IN THE WILD: Juveniles: benthic algae; adults: mainly zooplankton.

REPRODUCTION: Pelagic spawners

CONSERVATION: IUCN Red List Least Concern (LC)

REMARKS: Unicornfishes (Naso spp.) are characterized by 2 sharp, fixed (not moveable as in surgeonfishes), keel-like plates on the caudal peduncle. The skin is leathery with tiny non-overlapping scales, and teeth have finely serrate edges. Males of many Naso species are able to display spectacular iridescent markings during courtship.

References

California Academy of Sciences Steinhart Aquarium Philippine Coral Reef 2016

Ron’s flickr  http://www.flickr.com/photos/cas_docents/sets/72157608332652056/with/4332770529/

fishbase  fishbase.org/summary/SpeciesSummary.php?ID=6021&genus…

Encyclopedia of Life  eol.org/pages/213852/details

IUCN www.iucnredlist.org/details/177990/0

Ron’s WordPress Shortlink: http://wp.me/p1DZ4b-Ho

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