Community-Led Drive to Save the Endangered Himalayan Ray-Finned Fish

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The indigenous Sangno clan of Arunachal Pradesh has started a community translocation initiative in the East Kameng district. This effort aims to protect the endangered Himalayan ray-finned fish (Schizothorax pelzami).

The Himalayan ray-finned fish (Schizothorax pelzami) is a specialized freshwater species belonging to the carp family (Cyprinidae). It is commonly called the Transcaspian marinka, while the local Nyishi community refers to it as Ngarsing.
This species belongs to the group of modern bony fishes named Teleostei. It possesses evolutionary physical traits designed specifically for survival in high-altitude cold waters.

The fish is native to high-altitude, fast-flowing mountain streams, rivers, and cold torrents across the sub-Himalayan and Transcaspian zones.
It thrives in clean and highly oxygenated glacial streams located thousands of feet above sea level, such as the Lapabung and Richaso streams in the eastern Himalayas.
It shares river systems with larger predators like the aggressive Mahseer, which is often called the tiger of the water. Therefore, the ray-finned fish requires shallow upland streams to breed safely.

The International Union for Conservation of Nature (IUCN) Red List officially classifies this fish species as Endangered globally.

Flexible bony rays support its fins, offering better balance and control while swimming in swift mountain currents.
Its tail features equal upper and lower lobes, known as a homocercal tail. This structural design generates balanced thrust for efficient forward motion.
The species has an extendable mouth mechanism that allows it to suck algae and small organisms directly from riverbed rocks.
Thin and overlapping scales cover its body, which reduces body weight and water resistance during high-speed swimming.

This species reacts quickly to changes in water temperature, pollution, and oxygen levels, serving as a reliable indicator of Himalayan river health.
Conservation measures enforced by the Nyishi community, such as temporary fishing bans, protect fish numbers while supporting local eco-tourism and traditional livelihoods.