Scientific Name
Ptereleotris evides

Common Name
Blackfin dartfish

Biology
Dorsal spines (total): 7; Dorsal soft rays (total): 23-26; Anal spines: 1; Anal soft rays: 23 - 26; Vertebrae: 26. Light bluish gray in life, shading posteriorly to black; snout blackish; operculum with iridescent blue markings. Chin with a low fleshy protuberance, narrowing posteriorly to a low longitudinal fold. Caudal fin lobes blackish to dark reddish, broad centro-posterior region of fin whitish to yellowish; 1st dorsal fin dull orangish; 2nd dorsal and anal fins largely blackish; pectoral base with an orange to orange-red bar edged in blue. Juveniles with an oval black spot larger than eye at lower base of caudal fin.

Classification

Classified By

Jordan & Hubbs, 1925

Class

Ray-finned fishes (Actinopterygii)

Order

Perch-like fish (Perciformes)

Family

Dartfishes (Ptereleotridae)

Distribution

Region

Indo-Pacific

Distribution

Indo-Pacific: Red Sea and East Africa (Ref. 2798) to the Line and Society islands, north to the Ryukyu and Ogasawara islands, south to New South Wales, Lord Howe Island, and Rapa.

Range

30°N - 30°S

Environment

Climate

Tropical

Water Temperature From

21 °C

Water Temperature To

27 °C

Depth From - meters

2 m

Depth To - meters

15 m

Zone

reef-associated

Environment

Marine; reef-associated; depth range 2 - 15 m (Ref. 1602), usually 2 - 15 m (Ref. 27115)

Trophic Level

3 s.e. 0.00 Based on diet studies.

Occurs in Marine / Salt water

True

Occurs in Brackish water

False

Occurs in Fresh Water

False

Occurs on Reefs

True

Is kept in Aquariums

True

Physical Size and Genetics

Maximum Length

14.0 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

Aquarium: commercial

Vulnerability

Low vulnerability (10 of 100)

Resilience

Unknown

Threat To Humans

Harmless

IUCN Red List Status

Not Evaluated