In the highlands of the eastern Himalayas, where the water temperature barely rises above zero and the oxygen in the rarefied air is scarcely enough even for a human being, nature unexpectedly presented a surprise: a fish that was thought to inhabit only the Tibetan Plateau and China has turned out to live on the Indian side of the mountains as well.
Scientists from the ICAR-Central Institute of Coldwater Fisheries Research, together with the Department of Fisheries of Arunachal Pradesh and the Shar-Tso committee, have recorded Schizopygopsis waddellii for the first time in a natural lake at an altitude of about 3900 metres in Tawang district. Until then, the species was known exclusively from finds on the Tibetan Plateau and in China, so the Indian record substantially expands the understanding of its range.
High-altitude lakes are isolated worlds with low temperatures, scarce food and extreme conditions. Only species adapted to cold and a rarefied environment survive in such places. The appearance of Schizopygopsis waddellii here indicates that the eastern Himalayas may harbour more such "migrants" than was previously thought.
The discovery became possible thanks to a combination of scientific expertise, local knowledge and fieldwork in hard-to-reach areas. The collaboration of researchers with government bodies and the local committee has shown how effectively joint efforts help document biodiversity in remote mountain water bodies.
Such finds are a reminder of how little we know about life beyond the mountain passes: one lake, one expedition — and the map of species distribution changes. Further taxonomic, ecological and genetic studies will help to understand how resilient these populations are and what conditions they need.
Systematic surveys of high-altitude water bodies make it possible not only to add to faunal lists but also to identify vulnerable places that require protection before climate change or economic activity disrupts the fragile balance.
