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Stegastes fasciolatus


Stegastes fasciolatus 
Pacific Gregory 
Family tree:
Animalia (Kingdom) > Chordata (Phylum) > Actinopterygii (Class) > Perciformes (Order) > Pomacentridae (Family) > Stegastes (Genus) > fasciolatus (Species) 
Initial determination:
(Ogilby, ), 1889 
Austral Islands, Réunion , Midway Islands, Northern Mariana Islands, Raja Amat, the Society Islands, the Cocos Islands / Keeling Islands, Tasman Sea, Vietnam, Ashmore and Cartier Islands, Hong Kong, Lord Howe Island, United States Minor Outlying Islands, Norfolk Island, Papua, the Chagos Archipelago (the Chagos Islands), Komodo (Komodo Island), the Kermadec Islands, Tansania, Mozambique, Yemen, Amerikansk Samoa, Andamanhavet, Australien, Bali, Banggai øer, Cargados-Carajos, Fiji, Fransk Polynesien, Guam, Hawaii, Indo Stillehavet, Indonesien, Japan, Johnston Atollen, Juleøerne, Kenya, Kina, Madagascar, Marshall øerne, Mauritius , Mikronesien , New Zealand, Ny Kaledonien, Oceanien, Palau, Papua NeuGuinea , Påskeøen, Pitcairns øgruppen, Queensland, Ryukyu øerne, Salomonøerne, Samoa, Seychellerne, Sri Lanka, Sumatra, Syd Afrika, Taiwan, Togian, Tonga, Vanuatu , Vestlige Indiske ocean, Øst Afrika 
Sea depth:
1 - 30 Meter 
bis zu 16cm 
0°C - 27°C 
Carrion, Alger, invertebrater, zooplankton 
Toxic hazard unknown 
Related species at
Catalog of Life
More related species
in this lexicon
Last edit:
2018-06-03 19:23:31 


(Ogilby, 1889)

This drab, blackish or brownish gray damselfish has bright lemon-yellow eyes and a patchy unkempt appearance due to some scales being lighter than others. Common in Hawai`i, it prefers areas with moderate to low wave activity and feeds primarily on green filamentous algae. Each Pacific Gregory maintains an all-purpose territory (containing shelter and a nesting site as well as food) which it boldly defends against all other algae-eating fishes. The territory extends about 2-4 ft. in all directions from the shelter hole and is usually defined by natural formations such as coral heads or clumps of weed. (Containing more algae than surrounding areas, Pacific Gregory territories are sometimes, but not always, discernible to humans.) Like similar Indo-Pacific and Caribbean damsels, the Pacific Gregory "farms" its patch of filamentous algae by removing undesirable coralline algae. It also eats small invertebrates living in its algal farm.
As anyone who has watched a Pacific Gregory for a few minutes can attest, this pugnacious little fish will unfailingly attempt to drive any other herbivore from its algae patch. It does not waste energy by attacking carnivores such as wrasses, but experiments show it can learn to recognize and attack algae-eating fish species it has never seen before. A male Pacific Gregory will also defend its territory against males of its own species. When displaying aggression to another male, it darkens its yellow eyes (see "Oh Those Dark Eyes" below). Juveniles, bluish black with a pale yellow tail, appear during the summer months, often on wave-scoured reef flats. Those under 1 in. have an iridescent blue-purple streak along the top of the head and margin of the dorsal fin. The species name means "banded." To about 6 in. Indo-Pacific, but with a slightly different color pattern in Hawai`i (see "Three Color Patterns" below). Pomacentrus jenkinsi is a synonym.
Source: by John P. Hoover, Hawaii

Eupomacentrus fasciolatus (Ogilby, 1889)
Eupomacentrus marginatus Jenkins, 1901
Eupomacentrus paschalis Whitley, 1929
Pomacentrus atrilabiatus Fowler, 1946
Pomacentrus craticulus Smith, 1965
Pomacentrus fasciolatus Ogilby, 1889
Pomacentrus inornatus Jordan & Seale, 1906
Pomacentrus jenkinsi Jordan & Evermann, 1903
Pomacentrus luteobrunneus Smith, 1960
Pomacentrus niomatus De Vis, 1884
Pomacentrus vanderbilti Fowler, 1941
Pseudopomacentrus navalis Whitley, 1964
Stegastes faciolatus (Ogilby, 1889)
Stegastes fasciatus (Ogilby, 1889)

Classification: Biota > Animalia (Kingdom) > Chordata (Phylum) > Vertebrata (Subphylum) > Gnathostomata (Superclass) > Pisces (Superclass) > Actinopteri (Class) > Perciformes (Order) > Labroidei (Suborder) > Pomacentridae (Family) > Stegastes (Genus) > Stegastes fasciolatus (Species)




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