Parakneria thysi fish confirmed to climb 15-meter waterfalls

Researchers have confirmed the existence of a fish species capable of climbing vertical rock surfaces, a phenomenon previously regarded as local legend in Central Africa. A study published in Scientific Reports details the behavior of Parakneria thysi, locally known as the shell ear fish, which is endemic to the upper Congo River basin.

Led by biologist Pacifique Kiwele Mutambala from the University of Lubumbashi, the team observed thousands of these small fish, measuring between 37 and 48 millimeters, ascending the 15-meter Luvilombo Falls. Unlike fish that leap, these specimens adhere to the wet rock using tiny hooks on their pectoral and pelvic fins, supported by specialized muscles.

The ascent is a slow, energy-intensive process. While the actual movement takes approximately 15 minutes, the entire climb can last nearly ten hours due to frequent pauses required for the fish to recover energy.