Parakneria thysi Fish Scale 15‑Meter Congo Waterfall
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- Parakneria thysi — the shellear fish — were recorded scaling the 50‑foot (15 m) Luvilombo Falls on the Luvilombo River in the upper Congo Basin, with thousands observed migrating upstream between 2018 and 2020.
- Pacifique Kiwele Mutambala and his team at the University of Lubumbashi documented the behavior and published the findings in Scientific Reports (2026).
- The fish use hook‑like projections on specialized pads of their pectoral and pelvic fins and enlarged muscles to cling to wet rock surfaces, and only individuals under about 48 mm can climb.
- The climb takes roughly 9 hours 45 minutes, with only about 15 minutes of actual upward movement and frequent rests on nine horizontal ledges.
- Predators are more abundant downstream, while upstream habitats offer less competition and more food, which may motivate the migration.
- Illegal netting and downstream river diversion for irrigation pose major threats, as the fish are easily caught with mosquito‑net seining (banned by DRC law) and the river can dry out after the rainy season.
Why it matters: The discovery highlights a unique migratory behavior that could inform river‑management policies, benefitting conservationists and local communities that rely on sustainable fisheries, while illegal netting and irrigation threaten the fish’s habitat and future survival; noting that only sub‑48 mm individuals can climb, the study underscores the urgency of protecting the upstream riffles where the fish breed.
