Thryssa rastrosa, the Fly River thryssa, is a species of ray-finned fish in the family Engraulidae. It is found in Oceania.Whitehead, P.J.P., G.J. Nelson and T. Wongratana, 1988. FAO Species Catalogue. Vol. 7. Clupeoid fishes of the world (Suborder Clupeoidei). An annotated and illustrated catalogue of the herrings, sardines, pilchards, sprats, shads, anchovies and wolf-herrings. FAO Fish. Synop. 125(7/2):305-579. Rome: FAO.

Size This species reaches a length of .

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