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Ramnogaster melanostoma (Eigenmann, 1907) Uruguay river sprat |
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photo by
FAO |
| Family: | Clupeidae (Herrings, shads, sardines, menhadens) | |||
| 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. (130435) | |||
| Threat to humans: | harmless | |||