Thalassoma jansenii, Bali, Indonesia, Photo: Ian Shaw
Thalassoma jansenii, Raja Ampat, Indonesia, Photo: Andrew Green
Pectoral fins proportionally shorter than in T. nigrofasciatum, and juveniles with more light bars (often 5-6). Otherwise difficult to distinguish within overlapping range in the SW Pacific [Note that most records from the Australian east coast are likely Thalassoma nigrofasciatum, however, needing correction in the database].
Max Size: 20 cm
Sea Temperature Range: 19.8-31.3°C
Habitat: Coral Reef
Habitat Generalisation Index: 13.8
Also referred to as the SGI (Species generalisation index), this describes the habitat niche breadth of the species.
Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most
hard substrates within their range (generalists). Learn more here
IUCN Threat Status: Least Concern
Occurrence: Frequent (13% of sites)
Occurrence describes how often the species is found on surveys within its distribution.
It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed
Abundance: Several (6 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.