HomeFish encyclopediaRay-finned fishesSilversidesNeotropical silversidesBlackback silverside Blackback silverside (Melanorhinus cyanellus) Scientific name: Melanorhinus cyanellus Meek & Hildebrand, 1923 The Blackback silverside (Melanorhinus cyanellus) is a marine fish of the family Atherinopsidae. Native range: Eastern Central Pacific, Costa Rica and Panama. Species factsScientific nameMelanorhinus cyanellusFamilyAtherinopsidae (Neotropical silversides)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length10.0Depth range10 m (33 ft)EnvironmentMarine; reef-associated; depth range ? - 10 mClimateTropicalDistributionEastern Central Pacific: Costa Rica and Panama.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026