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Which River Fish Has Wing Like Fins?

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Julii Brainard answered
The freshwater whipray (Himantura chaophraya)? Its range is over most of south east Asia and northern Australia. Like other rays, its side fins basically merge into it's flat-shaped body.

Carnegiella marthae (the black-winged hatchet fish) is a small fish with wing-like fins up on its body; their preferred habitat is flowing water; naturally found in Central and South America.

Many lampreys are also said to have "winglike" fins, which come into use most of all when they are swimming upriver to spawn.

I think there must be more fish with wing-like fins. I did find the African butterfly fish ( Pantodon buchholzi, an exotic kept in freshwater home aquariums); these fish really can sort of fly over large water surfaces, but they prefer stagnant rather than moving water (lakes rather than rivers).

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