Oligosarcus

Rarity: Common

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At a glance

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What Wikipedia says

Oligosarcus is a genus of freshwater ray-finned fishes belonging to the family Acestrorhamphidae, the American characins. The fishes in this genus are found in South America. They reach up to 31 cm (12 in) in length and are predators that mainly feed on smaller fish.

Excerpt from the Wikipedia article “Oligosarcus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Cláudio D. Timm, CC BY 2.0, via Wikimedia Commons.