Freshwater Fish in the Shivaliks
📅 Published 05 Apr 2026 · April
Freshwater Fish in the Shivaliks
Source: Times of India
Context:
- Palaeontologists have discovered freshwater fish fossils for the first time in the Shivalik foothills near Mohand (outskirts of Dehradun).
- This site was previously known exclusively for terrestrial (land) animal remains. Finding aquatic fossils suggests a much more diverse prehistoric ecosystem than previously understood.
- Timeline: The fossils date back to the Pliocene Epoch, specifically around 4.5 million years ago.
- The Team: Researchers from the Wadia Institute of Himalayan Geology (WIHG), Dehradun, and other institutions led the discovery.
THE DISCOVERY: OTOLITHS AND SPECIES
The researchers did not find full skeletons but rather Otoliths—the calcium carbonate “ear bones” of fish. These are highly resistant to decay and act as a “black box” for scientists, revealing the fish’s age, species, and the water chemistry of its time.
1. Three Distinct Species Found:
- Snakehead (Channidae): Known for being hardy predatory fish.
- Goby (Gobiidae): Small, typically bottom-dwelling fish.
- Gourami (Osphronemidae): This is the star of the find. It is the first recorded appearance of a Gourami fossil in India and only the second in the entire world (the first was in Sumatra, Indonesia).
BACKGROUND CONCEPTS
1. The Shivalik Group
The Shivalik Hills are the youngest mountain range of the Himalayas, formed by the accumulation of debris from the rising Himalayas over millions of years. Historically, it is famous for fossils of elephants, giraffes, and even early apes (Sivapithecus).
2. The Pliocene Epoch (5.3 to 2.6 Million Years Ago)
This was a time of global cooling and drying. In India, the Himalayan uplift was intensely active. The discovery of these fish proves that despite the rising mountains, stable freshwater river systems and lakes existed in north India during this period.
3. Biogeographic History
This find helps scientists trace how fish species moved across Asia (Biogeography). The link between the Gourami found in India and the one in Sumatra suggests a prehistoric “water highway” or connected river systems across South and Southeast Asia.