Overview

Comprehensive Description

Biology

Occurs on rocky bottom or coral reefs (Ref. 27370).
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Distribution

Central Pacific.
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Pacific Ocean: Cook Islands, Pitcairn, and French Polynesia.
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Physical Description

Morphology

Dorsal spines (total): 11; Dorsal soft rays (total): 13 - 14; Analspines: 4; Analsoft rays: 8 - 10; Vertebrae: 27
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Size

Maximum size: 166 mm SL
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Max. size

16.6 cm SL (male/unsexed; (Ref. 27370))
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Diagnostic Description

Body striped red and silvery white, the red stripes about 3 times as broad as the white; spinous part of dorsal fin red except for white tips and a row of 6 white spots, one per membrane, near the base of the fin. Upper edge of suborbital bones below anterior half of orbit spineless and not serrate; small spine at medioposterior margin of nasal bone usually absent; nasal fossa without spinules; small preopercular spine, usually less than half orbit diameter; body depth 2.8-3.1 in SL; head length 2.7-3.05 in SL; longest dorsal spines, 1.9-2.2 in head length; third anal spine 1.2-1.45 in head length. Anal rays usually 9; pectoral usually 5 (Ref. 27370).
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Type Information

Paratype for Sargocentron hormion Randall
Catalog Number: USNM 345846
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): J. Randall & et al.
Year Collected: 1970
Locality: Off W. Harbor, Pitcairn Island, Pitcairn Island, Pitcairn Islands, Pacific
Depth (m): 12 to 15
  • Paratype: Randall, J. E. 1998. Indo-Pacific Fishes. No. 27: 29.
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Ecology

Habitat

Depth: 1 - 42m.
From 1 to 42 meters.

Habitat: reef-associated. Name from the Greek word 'hormion' meaning necklace or string of things, referring to the conspicuous series of 6 white spots anteriorly in the red spinous part of the dorsal fin.
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Environment

reef-associated; marine; depth range 1 - 42 m (Ref. 27370)
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Depth range based on 9 specimens in 1 taxon.
Water temperature and chemistry ranges based on 8 samples.

Environmental ranges
  Depth range (m): 2 - 20
  Temperature range (°C): 22.368 - 22.496
  Nitrate (umol/L): 0.121 - 0.139
  Salinity (PPS): 35.516 - 35.552
  Oxygen (ml/l): 5.032 - 5.079
  Phosphate (umol/l): 0.145 - 0.165
  Silicate (umol/l): 1.623 - 2.486

Graphical representation

Depth range (m): 2 - 20

Temperature range (°C): 22.368 - 22.496

Nitrate (umol/L): 0.121 - 0.139

Salinity (PPS): 35.516 - 35.552

Oxygen (ml/l): 5.032 - 5.079

Phosphate (umol/l): 0.145 - 0.165

Silicate (umol/l): 1.623 - 2.486
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Conservation

Threats

Not Evaluated
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