Context
Sikkim Chief Minister Prem Singh Tamang released Chocolate Mahseer fish into the Rangeet River during a River Fest. The initiative aims to conserve indigenous fish species and protect Sikkim’s aquatic biodiversity.

Explanation
- Chocolate Mahseer, also called Copper Mahseer, is a freshwater fish belonging to the Cyprinidae family.
- It inhabits fast-flowing, oxygen-rich Himalayan rivers with rocky riverbeds.
- It is distributed across the Brahmaputra and Chindwin river basins and parts of South and Southeast Asia.
- It is the State Fish of Sikkim and Nagaland and is classified as Near Threatened on the IUCN Red List.
- The Rangeet River, a major tributary of the Teesta River, belongs to the Brahmaputra river system.
- Fish ranching involves releasing hatchery-reared fish into natural water bodies to replenish wild populations.
- Habitat degradation, pollution, overfishing and river fragmentation threaten mahseer populations.
- Conservation measures include habitat restoration, sustainable fishing and protection of breeding grounds.
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