Fin's Fish Guide
The Blue-backed silver biddy (Gerres erythrourus) is a brackish-water fish of the family Gerreidae that grows up to 30 cm.
Description
The deep-bodied mojarra is a mojarra (Gerreidae) from the Indo-Pacific. The species grows to about 30 cm and has a deep, silvery, laterally compressed body with sometimes reddish fins and a highly protrusible mouth that it can extend downward as a tube. It is a marine species that also enters estuaries and coastal lagoons. It forms schools over sandy bottoms. Small juveniles feed on zooplankton, while larger individuals sift small polychaetes, bivalves and crustaceans from the bottom. The species is harmless to humans.
Frequently asked questions
How do you recognise the Blue-backed silver biddy?
The Blue-backed silver biddy has a flattened, disc-shaped body, is mainly silver-grey and shows a plain pattern. Highly protrusible tube mouth; forms shoals over sand and enters estuaries.
Where does the Blue-backed silver biddy live?
The Blue-backed silver biddy lives in brackish water and is mostly found around stony or rocky ground. Indo-Pacific; sandy bottoms, estuaries and coastal lagoons.
How big does the Blue-backed silver biddy get?
The Blue-backed silver biddy grows to a maximum of about 30 cm. On average the species is around 25 cm.
Is the Blue-backed silver biddy dangerous to humans?
No, the Blue-backed silver biddy is harmless to humans. None required: this species is harmless to humans.
Is the Blue-backed silver biddy edible?
Yes, the Blue-backed silver biddy is commonly eaten.
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All data
Identification
Appearance
Habitat & distribution
Behaviour & biology
For anglers
Safety
Status & sources
Same genus Gerres
More from the family Gerreidae
Want the complete picture on the Blue-backed silver biddy?
Point your camera at the fish and Fin names the species in seconds. Free, and the Blue-backed silver biddy is one of 12,519 species in the app.