Ten species of fish never seen before in Vietnam were discovered by a 68-year-old biology researcher.
Prof. Nguyen Thai Tu also identified 162 varieties of freshwater fish in Phong Nha -Ke Bang National Park, a World Heritage Site, after eight years of research.
He found seven kinds of fish of the family Cyprinini, including ton, black carp and red carp. He said his research confirmed that the park has the highest natural bio-diversity of the country's national parks and reserves.
"Leading ichyologists think that most freshwater fish in the world originated in South-east Asia. I have proven that the Cyprinus fish was bred in Phong Nha-Ke Bang," he said.