Context: Scientists from the ICAR-Central Institute of Coldwater Fisheries Research, in collaboration with the Arunachal Pradesh Department of Fisheries, recorded the rare Tibetan fish species Schizopygopsis waddellii for the first time in India.
About Schizopygopsis waddellii:
What it is?
- A cold-adapted freshwater fish species belonging to the Cyprinidae family (specifically the snowtrout / schizothoracine group). It was confirmed as a new record for India through an integrative taxonomic approach combining detailed morphological examination with mitochondrial DNA (mtDNA) molecular analysis.
Habitat:
- Native to fragile, cold-water, high-altitude aquatic ecosystems across the Tibetan and Chinese plateaus (with Yamdok Lake in Tibet recorded as its historical type locality).
- In India, discovered in Pangkang Teng Tso Lake (elevation 12,800 feet) in the border district of Tawang, Arunachal Pradesh, extending its known geographic range into the Eastern Himalayas.
Key Characteristics:
- Streamlined Hydrodynamic Morphology: Possesses an elongated, sub-cylindrical body with a dark greyish to olive-coloured dorsal side and a silvery to creamy-white underside.
- Specialised Feeding Structure: Features a blunt snout, a subterminal mouth, and a distinctive, hard plate-like horny structure around the lower lip and snout adapted for scraping algae and scraping biofilm off submersed river rocks.
- Distinct Caudal and Lateral Anatomy: Characterized by a deeply forked caudal fin that provides rapid propulsion in cold, high-velocity currents, alongside a prominent and complete lateral line system.
- Marked Sexual Dimorphism: Displays pronounced morphological variation between sexes; males bear numerous small, visible nuptial tubercles/spines on the body and exhibit vibrant coloration, whereas females lack spines and appear duller.
- High-Altitude Physiological Adaptations: Genetically and physiologically adapted to withstand freezing water temperatures, low oxygen saturation, and oligotrophic high-altitude lacustrine environments.
Significance:
- Formally adds a new genus/species record to India’s freshwater ichthyofauna, expanding the known biogeographical distribution of trans-Himalayan fish taxa.
- Establishes vital ecological and evolutionary linkages between the high-altitude water systems of the Eastern Himalayas and the broader Tibetan Plateau.
