Ruivaco
Achondrostoma oligolepis
- Least concern
- Card rarity: Common
- Fish

Achondrostoma oligolepis, the ruivaco, is a species of freshwater ray-finned fish belonging to the family Leuciscidae, which includes the daces, Eurasian minnows and related fishes. This species is endemic to Portugal.
Classification
- Class
- Actinopterygii
- Order
- Cypriniformes
- Family
- Leuciscidae
- Genus
- Achondrostoma