Scientific Name
Stegastes altus

Common Name
Japanese gregory

Biology
Dorsal spines (total): 12 - 13; Dorsal soft rays (total): 15-17; Anal spines: 2; Anal soft rays: 12 - 13. Body color is medium brown, sometimes with slight diffusion of yellow. The edges of scales are narrowly bordered with dusky brown. The suborbital is lavender or blue and the lips are pale gray. The pectoral fins are translucent with brownish rays and yellow suffusion on posterior edge. A prominent black spot bordered with light blue is on the outer part of anterior dorsal spines running from base of 1st spine to distal tip of 5th or 6th spine.

Classification

Classified By

Okada & Ikeda, 1937

Class

Ray-finned fishes (Actinopterygii)

Order

Perch-like fish (Perciformes)

Family

Damselfishes (Pomacentridae)

Distribution

Region

Northwest Pacific

Distribution

Northwest Pacific: known only from Japan and the adjacent Ryukyu Islands. Recently reported from Taiwan (Ref. 12711) and South Korea (Ref. 77001).

Range

46°N - 25°N

Environment

Climate

Subtropical

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

5 m

Depth To - meters

20 m

Zone

reef-associated

Environment

Marine; reef-associated; non-migratory; depth range 5 - 20 m (Ref. 9710)

Trophic Level

2 s.e. 0.00 Based on food items.

Occurs in Marine / Salt water

True

Occurs in Brackish water

False

Occurs in Fresh Water

False

Occurs on Reefs

True

Is kept in Aquariums

False

Physical Size and Genetics

Maximum Length

15.0 cm

Common Length

Unknown cm

Phylogenetic Diversity Index

PD50 = 0.5000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses

Unknown

Vulnerability

Low to moderate vulnerability (26 of 100)

Resilience

High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.)

Threat To Humans

Harmless

IUCN Red List Status

Not Evaluated