Gerres filamentosus Cuvier, 1829
Whipfin silver-biddy
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Family:  Gerreidae (Mojarras)
Max. size:  39 cm TL (male/unsexed)
Environment:  demersal; freshwater; brackish; marine; depth range 1 - 50 m, amphidromous
Distribution:  Indo-Pacific: East Africa and Madagascar to Japan and Australia; New Caledonia (Ref. 26587) and Vanuatu (Ref. 13300). Enters rivers and lakes in Madagascar and the east coast of Africa. Not in the Middle East (Ref. 103159).
Diagnosis:  Dorsal spines (total): 9-9; Dorsal soft rays (total): 10-11; Anal spines: 2-3; Anal soft rays: 7-8. Description: Body silvery with 7-10 and oval black spots in vertical series on upper half side. caudal fin large and forked deeply. Maxillary reaches beyond level of eye anterior edge. Body depth max 2.0-2.5 in SL. Scales above LL to middle dorsal spines 4.5-5.5. Dorsal fin 2nd spine filamentous and very long, 1.7-2.0 in SL; pectoral fins reaches beyond level of anal fin origin; caudal fin large and forked deeply. (Ref. 4967, 48635, 90102)
Biology:  Adults are coastal inhabitants found on soft bottoms (Ref. 44894), over sandy substrate (Ref. 12693). Juveniles are found in brackish mangrove estuaries, sometimes enter fresh water (Ref. 2847, 44894), lakes (Ref. 4323), tidal creeks (Ref. 44894) and lower freshwater reaches of rivers (Ref. 12915). Feed on small crustaceans, polychaetes and forams on sand or muddy-sand bottoms (Ref. 12915), worms and insect larvae (Ref. 12693). Length at first reproduction was reported to be around 12 cm SL, for a population in a South African estuary (D. Woodland, pers.comm. 07/13). Salted or made into fish sauce.
IUCN Red List Status: Least Concern (LC); Date assessed: 11 July 2016 Ref. (124695)
Threat to humans:  harmless
Country info:   

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