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KINSHASA: Thousands of tiny fish have been observed scaling a 15-metre vertical waterfall in the Democratic Republic of Congo, highlighting a striking example of adaptation in the wild.

Researchers recorded the behaviour of a shellear fish species, Parakneria thysi, at Luvilombo Falls in the upper Congo Basin.

The fish were seen climbing the rock face during seasonal floods at the end of the rainy season, typically in April and May, with only smaller individuals measuring about 3.7 to 4.8cm completing the ascent.

Observations showed each climb could take nearly 10 hours, with the fish moving in short bursts along wet rock surfaces and gripping using their fins aided by tiny hook-like structures.

Lead author Pacifique Kiwele said the findings, published in Scientific Reports, underscore the importance of preserving natural water systems and expand understanding of fish behaviour in the Congo Basin.