Scientific Name
Thalassoma jansenii

Common Name
Jansen's wrasse

Biology
Dorsal spines (total): 8; Dorsal soft rays (total): 13; Anal spines: 3; Anal soft rays: 11. Color pattern remains similar throughout life. Large juveniles and females are mostly black with a single white band and white area below the head to the anus. Males retain the white central band but is more yellow, and develops a second narrow band halfway towards the head (Ref. 48636). Initial phase white with 3 black bars, the first on upper half of head and anterior body containing a yellow streak at edge of opercle, the second across dorsal fin and ventrally to anus, the third covering most of body and posterior portions of dorsal and anal fins. Terminal male with yellow between black bars. Pectoral fins bluish (Ref 9823).

Classification

Classified By

Bleeker, 1856

Class

Ray-finned fishes (Actinopterygii)

Order

Perch-like fish (Perciformes)

Family

Wrasses (Labridae)

Distribution

Region

Indo-West Pacific

Distribution

Indo-West Pacific: Maldives to Fiji, north to southern Japan, south to Lord Howe Island.

Range

35°N - 47°S, 70°E - 175°W

Environment

Climate

Tropical

Water Temperature From

24 °C

Water Temperature To

28 °C

Depth From - meters

1 m

Depth To - meters

15 m

Zone

reef-associated

Environment

Marine; reef-associated; non-migratory; depth range 1 - 15 m (Ref. 1602), usually 1 - 12 m (Ref. 27115)

Trophic Level

3.29 s.e. 0.45 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

20.0 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 to moderate vulnerability (30 of 100)

Resilience

Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.)

Threat To Humans

Harmless

IUCN Red List Status

Least Concern (LC)