Ambassis jacksoniensis

Port Jackson Glassfish | Port Jackson Perchlet
Ambassis jacksoniensis
Ambassis jacksoniensis, Jervis Bay, New South Wales, Australia, Photo: Graham Edgar


Temperate Australasia, Tropical Indo-Pacific


Body translucent and slender, dorsal fin deeply-notched and transparent, rounded snout. Generally noticed by divers under jetties and along breakwaters, where animals can shelter from predators and feed on passing plankton.


Max Size: 7 cm

Sea Temperature Range: 12.4-23°C

Depth: 0-6m

Habitat Generalization Index: N/A

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.

Conservation and Rarity

IUCN Status: Not Evaluated

Occurrence: Infrequent (1.5% 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: Large aggregations (279 per transect)

Abundance is calculated as the average number of individuals recorded per RLS transect, where present.

Edit by: GJ Edgar. 2008. Australian Marine Life. New Holland, Sydney