Strongylura incisa

Reef Longtom | Driller's Longtom | Large-scale Longtom | Moguya | Reef Needlefish
Strongylura incisa
Strongylura incisa, adult, Chilcott Reef, Coral Sea, Photo: Andrew Green


Tropical Indo-Pacific


Bottom lobe of tail longer than top, with middle of tail margin wavy rather than forked as in Tylosurus crocodilus (crocodile longtom - not shown) .


Max Size: 100 cm

Sea Temperature Range: 21.4-33.7°C

Depth: 0-3m

Habitat Generalization Index: 0.09

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 (1.2% 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 (10 per transect)

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

Edit by: RD Stuart-Smith, GJ Edgar, AJ Green, IV Shaw. 2015. Tropical Marine Fishes of Australia. Reed New Holland