Gerres longirostris (Lacepède, 1801)
Gerres longirostris (Lacepède, 1801)
Genus: ,

Scientific Name: Gerres longirostris

English Name: Strongspine silver-biddy

Creole Name: Breton

French Name: Blanche commune

IUCN Red List Status: Least Concern (LC)


Dorsal spines: 9; Dorsal rays: 10; Anal spines: 3; Anal rays: 7.

Full bodied Mojarra. Upper jaw extending vertically beyond anteriormost margin of eye, sometimes reaching to vertical at anterior margin of pupil. Second dorsal fin spine 
longest. Pectoral fins reaches to or beyond level of anal fin origin. Caudal fin forked deeply.

Colour. Body greyish-white above becoming silvery below with prominent dark stripes along scale rows above lateral line in living specimens. 4-9 somewhat oblique dusky bars 
or columns of ovoid dark spots immediately below lateral line in specimens over 10 cm SL (dusky bars on less than 10 cm).  Dorsal fin membrane with faint black blotches or 
small spots at base of each spine and ray. Dorsal fin membrane silvery anteriorly on 1st-5th dorsal spine, grading to hyaline on spinous and soft dorsal fin. Anal fin scaly 
basal sheath silver; pectoral and anal fins hyaline. Caudal fin dusky with broad darker margin posteriorly; ventral edge of lower caudal fin lobe white or bluish-white.


Maturity: Lm unknown. Range unknown. Max Length: 44.5 cm TL. Commonly 20cm TL.


Habitat and Ecology:

Often found in clear coastal waters (depth 0-50m) with a preference for shallow waters over sandy substrates. Juveniles are often observed in estuaries or lagoons influenced 
by freshwater. Occur singly or in groups. Feed on small benthic invertebrates.

Females tend to grow significantly faster than males and achieve greater overall sizes than males. The mean size at first sexual maturity is 16.3 cm for males and 20.6 cm 
for females.

Fishery Status:

This species is not protected or subject to fishery regulations. It is caught in the net fishery, and is occasionally caught in quite large numbers.


Gerres longirostris differs from G. oblongus in having a deeper body (mean 39% SL vs mean 33% SL in G. oblongus), fewer pored lateral line scales (43±46 vs 45±49), and a 
broad dark caudal on posterior margin.


Froese, R. & D. Pauly. (Eds.) (2020). FishBase. Gerres longirostris (04/04/20).
Iwatsuki, Y. et al. (2001). Redescription of Gerres longirostris (LacepeÁde, 1801) and Gerres oblongus Cuvier in Cuvier and Valenciennes, 1830, Included in the Gerres 
Complex (Perciformes: Gerreidae). Copeia, 2001(4), pp. 954-965.
Munroe, T.A. et al. (2016). Gerres longirostris (errata version 2017). The IUCN Red List 2016: (04/04/20).


Nevill, J.E.G. (2020). Gerres longirostris, Strongspine silver-biddy. Seychelles Seatizens. (edited 03/07/22).

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