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Overview

Comprehensive Description

Biology

Adults inhabit coral or rocky outer reefs (Ref. 7247). Oviparous, distinct pairing during breeding (Ref. 205). Eggs are demersal and adhere to the substrate (Ref. 205). Males guard and aerate the eggs (Ref. 205).
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Distribution

Northwest Pacific: Miyake-jima, Bonin Islands of Japan and south to Taiwan.
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Western North Pacific.
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Physical Description

Morphology

Dorsal spines (total): 11 - 12; Dorsal soft rays (total): 12 - 13; Analspines: 2; Analsoft rays: 12 - 13
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Size

Maximum size: 65 mm SL
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Max. size

6.5 cm SL (male/unsexed; (Ref. 7247))
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Diagnostic Description

Overall color is brown with a prominent black spot on the base of the pectoral fin. Caudal fin and peduncle white.
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Type Information

Paratype for Chromis alleni Randall et al.
Catalog Number: USNM 220557
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): J. Shepard & K. Meyer
Year Collected: 1976
Locality: Okinawa, Nakagusku Bay, Japan, Okinawa Prefecture, Japan, Ryukyu Islands, Pacific
Depth (m): 30
  • Paratype: Randall, J. E., et al. 1981. Japanese Journal of Ichthyology. 28 (3): 215.
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Ecology

Habitat

Environment

reef-associated; non-migratory; marine; depth range 10 - 30 m (Ref. 559)
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Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 5.5 - 5.5
  Temperature range (°C): 26.960 - 26.960
  Nitrate (umol/L): 0.498 - 0.498
  Salinity (PPS): 34.192 - 34.192
  Oxygen (ml/l): 4.578 - 4.578
  Phosphate (umol/l): 0.284 - 0.284
  Silicate (umol/l): 4.892 - 4.892
 
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Depth: 10 - 30m.
From 10 to 30 meters.

Habitat: reef-associated. Inhabits coral or rocky outer reefs.
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Life History and Behavior

Life Cycle

Oviparous, distinct pairing during breeding (Ref. 205). Eggs are demersal and adhere to the substrate (Ref. 205). Males guard and aerate the eggs (Ref. 205).
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Conservation

Threats

Not Evaluated
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Disclaimer

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