Longspine Silverbiddy, Gerres macracanthus Bleeker 1854

Other Names: Longspined Silverbiddy, Thread-fin Silver-biddy

A Longspine Silverbiddy, Gerres macracanthus, in Tai Ho Stream, Lantau, New Territories, Hong Kong. Source: H.T. Cheng / iNaturalist. License: CC by Attribution-NonCommercial

A silvery gerreid, usually with rows of faint dark vertical bands on body that are not formed from oval spots.

Cite this page as:
Dianne J. Bray, Gerres macracanthus in Fishes of Australia, accessed 23 Sep 2023, https://fishesofaustralia.net.au/Home/species/2433

Longspine Silverbiddy, Gerres macracanthus Bleeker 1854

More Info


Widespread in the Indo-West Pacific. Adults inhabit coastal waters. Juveniles are found in estuaries, the lower reaches of coastal rivers and amongst mangroves.


Meristic features: Dorsal fin IX, 10; Anal fin III, 7; Pectoral fin 15; Lateral line pores 41-44; usually 4 1/2 scale rows between 5th dorsal-fin spine base and lateral line; 5 1/2 or 6 1/2 scales above lateral line, 9 1/2 or 10 1/2 below. 

Body relatively slender, compressed. Second dorsal-fin spine elongated and filamentous; short 2nd and 3rd anal-fin spines 9.1-14% and 10-14% SL, respectively. 


Body silvery, subadults and adults usually with 6-10 (rarely up to 14 as faint bands in larger specimens) indistinct dark vertical bands on body; bands not formed from oval spots.

Similar Species

Often confused with Gerres filamentosus, which has dark oval-shaped spots forming indistinct dark vertical bands on the sides.


Dianne J. Bray

Quick Facts

CAAB Code:37349021

Depth:0-30 m

Habitat:Marine, estuarine, soft bottom

Max Size:17 cm SL

Species Image Gallery

Species Maps

CAAB distribution map