Why in news?
Conservation groups in Tamil Nadu organised a fish count and awareness drive for otters in the Thamirabarani River. The surveys revealed rich aquatic life but also showed that otter sightings are dwindling. The river’s health is vital for communities and biodiversity in the region.
Background
The Thamirabarani originates from Agastyarkoodam peak in the Western Ghats and flows through Tirunelveli and Thoothukudi districts before emptying into the Gulf of Mannar. At about 128 kilometres long, it is the only perennial river in Tamil Nadu. The river’s name means “copper‑coloured leaf,” and it has supported agriculture, temples and trade for centuries.
Key findings
- A 2024 fish survey recorded 36 species, including 31 native species and three invasive ones.
- Endemic fish such as the Thamirabarani Barb, Mahseer, Half Beak fish and Torrent Catfish were observed.
- Volunteers spotted rare smooth‑coated otters at Papanasam; the river also hosts Asian small‑clawed and Eurasian otters.
- Environmentalists warn that habitat destruction, sand mining and pollution are shrinking otter populations.
- The river supports more than 600 fish species, including snakeheads, catfish and carp, according to local studies.
Conclusion
The Thamirabarani is a lifeline for southern Tamil Nadu. Careful management of water extraction, waste discharge and sand mining could safeguard its diverse fish and otter populations. Public awareness programmes are a positive step toward river conservation.
Source: ETV Bharat