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Johnrandallia nigrirostris  (Gill, 1862)

Blacknosed butterflyfish
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Image of Johnrandallia nigrirostris (Blacknosed butterflyfish)
Johnrandallia nigrirostris
Picture by Allen, G.R.

Classification / Names Noms communs | Synonymes | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinoptérygiens (poissons à nageoires rayonnées) > Perciformes (Perch-likes) > Chaetodontidae (Butterflyfishes)
Etymology: Johnrandallia: After John Randall, marine biologist, Bishop Museum of Hawaii; he worked in systematic ichthyology with fishes of Indopacific region.

Environment: milieu / climate zone / depth range / distribution range Écologie

; marin récifal; profondeur 6 - 40 m (Ref. 9286), usually 6 - 12 m (Ref. 9286).   Tropical; 40°N - 10°S, 120°W - 70°W

Distribution Pays | Zones FAO | Écosystèmes | Occurrences | Point map | Introductions | Faunafri

Eastern Pacific: Gulf of California to Panama, including the Cocos, Malpelo and Galapagos Islands.

Taille / Poids / Âge

Maturity: Lm ?  range ? - ? cm
Max length : 20.0 cm TL mâle / non sexé; (Ref. 9286); common length : 14.0 cm TL mâle / non sexé; (Ref. 55763)

Description synthétique Morphologie | Morphométrie

Épines dorsales (Total): 11 - 12; Rayons mous dorsaux (Total): 24-25; Épines anales 3; Rayons mous anaux: 18 - 20. Body deep, compressed, and disk-shaped; dorsal profile of head steep and concave; snout pronounced; teeth very small and se in a comb-like band; base of pelvic spine with an axillary process; lateral line complete, extending over caudal peduncle; body yellowish; snout with a dark stain; eye bordered with black; posterior edge of operculum, base of pectoral fins, nape, and dorsal border (at base of dorsal fin) black (Ref. 55763).

Biologie     Glossaire (ex. epibenthic)

Often in large schools (Ref. 5227) over coral and rocky reefs (Ref. 9286). Feed on algae, gastropods, and small crustaceans (Ref. 9286). Pick parasites from larger fishes like Paranthias colonus and Mulloides dentatus (Ref. 28023). Oviparous (Ref. 205). Form pairs during breeding (Ref. 205).

Life cycle and mating behavior Maturité | Reproduction | Frai | Œufs | Fécondité | Larves

Form pairs during breeding (Ref. 205).

Référence principale Upload your references | Références | Coordinateur | Collaborateurs

Schneider, M., 1995. Chaetodontidae. Peces mariposa. p. 1000-1003. In W. Fischer, F. Krupp, W. Schneider, C. Sommer, K.E. Carpenter and V. Niem (eds.) Guia FAO para Identification de Especies para lo Fines de la Pesca. Pacifico Centro-Oriental. 3 Vols. FAO, Rome. (Ref. 9286)

Statut dans la liste rouge de l'IUCN (Ref. 115185)

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Menace pour l'homme

  Harmless




Utilisations par l'homme

Aquarium: Commercial
FAO(Publication : search) | FishSource |

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Écologie
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Estimates of some properties based on models

Preferred temperature (Ref. 115969): 17.9 - 29, mean 26.6 (based on 144 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 1.0000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02754 (0.01639 - 0.04628), b=3.08 (2.93 - 3.23), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
Niveau trophique (Ref. 69278):  3.0   ±0.44 se; Based on food items.
Résilience (Ref. 69278):  Haut, temps minimum de doublement de population inférieur à 15 mois (Preliminary K or Fecundity.).
Vulnérabilité (Ref. 59153):  Low vulnerability (15 of 100) .