Ramnogaster melanostoma (Eigenmann, 1907)
Uruguay river sprat
photo by FAO

Family:  Clupeidae (Herrings, shads, sardines, menhadens), subfamily: Clupeinae
Max. size:  10 cm SL (male/unsexed)
Environment:  pelagic; freshwater
Distribution:  South America: Uruguay and Argentina.
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 15-16; Anal spines: 0-0; Anal soft rays: 12-23. Belly sharply keeled. No distinct silver stripe along the flank and the first (anterior) supra-maxilla minute or absent (cf. Platanichthys platana). Distinguished from very similar R. arcuata of coastal waters by having fewer dorsal and pectoral fin rays and fewer gill rakers total; from small Sardinella and Harengula by the evenly rounded hind margin of the gill opening.
Biology:  Apparently confined to freshwater at mouths of rivers and their lower reaches. Presumably schooling.
IUCN Red List Status: Least Concern (LC); Date assessed: 14 October 2019 Ref. (123251)
Threat to humans:  harmless
Country info:   
 

Entered by: Binohlan, Crispina B. - 17.10.90
Modified by: Bailly, Nicolas - 15.07.13
Checked by: Binohlan, Crispina B. - 23.07.94

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