VietNamNet Bridge – Scientists at the Institute of Ecology and Biological Resources have announced the discovery of a new fish species endemic to a cave system in the central region’s Quang Binh Province, which is home to the world’s biggest grotto, Son Doong.

Speolabeo hokhanhi, the new blind cavefish species found in Hang Va Cave in the central province of Quang Binh. — Photo recaptured by Phuoc Buu

Nguyen Dinh Tao, a researcher at the institute, announced the discovery of Sapeolapeo hokhanhi, a blind cavefish in the province’s Hang Va Cave.

Tạo and his associates made the announcement through a scientific report on Zootaxa, an international journal for animal taxonomists in September this year. Research on the new species was conducted during field trips in Quang Binh’s Son River basin starting in 2014.

“Speolabeo hokhanhi, a new species, can be distinguished from Sapeolabeo musaei by having no papillae on the lower lip, no hump immediately behind the head, a duckbilled snout and a shorter caudal peduncle,” said the report.

It also added that only six species of subterranean fishes have been reported from karst regions lying between Vietnam and Laos.

According to Tao, the newly-found cavefish has a white to pinkish coloured body and all of its fins are transparent.

The fish species, Speolabeo hokhanhi, is named after Ho Khanh, a local guide who discovered many caves in Phong Nha-Ke Bang National Park, including the entrance of Son Doong Cave. Khanh accompanied and assisted the researchers in caving during the field trips to study the cavefish.

View of part of the Hang Va Cave in the ’kingdom of karst cave’ Quang Binh Province. — Photo courtesy of Oxalis

The researchers also suggested the use of the phrase “hokhanh’s blind cavefish” in English and ‘cá mù hang va hồ khanh’ in Vietnamese to describe the cavefish species.

Hang Va Cave is located 900m behind the Son Doong. Nguyen Chau A, a member of the British Cave Research Association and director of a local travel company providing sole adventurous tours to Son Doong, said he found similar cavefish in the world’s biggest cave and is waiting for confirmation by experts.

Á suspected dark water in the cave is the evolutional cause to the no-eye condition on the newly-found fish species. He also believed there is a tiny underground stream connecting the Son Doong and Hang Va, facilitating the moving of the fish between the two caves.

Experts expected to find more new cavefish species in this karst caves once the research activities are fostered in the area. 

Source: VNS