Guwahati: In an exciting breakthrough for ichthyology, researchers have recently discovered two new species of torrent minnows in the pristine rivers of Nagaland.
A torrent minnow is a small freshwater fish belonging to the genus Psilorhynchus within the family Psilorhynchidae. These fish are commonly found in fast-flowing streams, particularly in regions with strong currents such as rivers and mountain streams, which is why they are called “torrent” minnows.
The two new species, Garra zubzaensis and Psilorhynchus kosygini, highlight the rich biodiversity of Nagaland and underscore the need for conservation efforts in the region’s unique aquatic ecosystems.
Garra zubzaensis: Found in Zubza River
The first discovery, Garra zubzaensis, was found in the Zubza River, a tributary of the Brahmaputra River in Kohima district. Described by a team of researchers led by Diamond Rajakumar Tenali, this new species belongs to the Garra genus within the Cyprinidae family, commonly known as torrent minnows. These fish are specially adapted to live in fast-flowing, rocky streams, using their gular discs—sucker-like structures—to cling to surfaces and forage for food. The other authors involved in the study include Bungdon Shangningam, Pampa Bhattacharjee, Arun Bhai Patel, and Laishram Kosygin.
Key Features of Garra zubzaensis
Garra zubzaensis is distinguished by a weakly developed proboscis, a rounded snout, and a characteristic black V-shaped band on the caudal fin. It has 34 lateral-line scales and a streamlined body adapted for life in swift currents. The species was named after the Zubza River, where it was first discovered. The river, with its mix of gravel, cobbles, and sand, provides an ideal habitat for this benthic species.
The discovery of Garra zubzaensis adds to the growing list of species in the Garra genus found across the Brahmaputra basin, making it a crucial find for understanding the diversity and adaptation of these fish in high-flow environments.
Psilorhynchus kosygini: A New Species from the Tepuiki River
The second new species, Psilorhynchus kosygini, was discovered in the Tepuiki River, a tributary of the Barak River in Nagaland’s Peren district. This species, belonging to the Psilorhynchidae family, commonly known as torrent minnows, was described by Bungdon Shangningam. Unlike Garra, which is found in various regions across Asia, Psilorhynchus kosygini belongs to a genus known primarily from South Asia and Southeast Asia, making its discovery in Nagaland particularly significant.
Key Features of Psilorhynchus kosygini
Psilorhynchus kosygini stands out due to its unique scale arrangement, with 3–4 mid-ventral scales between the pelvic fins and the anal opening. The species also has 41–42 lateral-line scales and a distinctive body shape suited for life in torrents. The fish was named in honor of Dr. Kosygin Laishram, a renowned scientist at the Zoological Survey of India, for his contributions to freshwater fish research.
This species was found in the fast-flowing, shaded waters of the Tepuiki River, where it thrives in the river’s gravel and rocky substrate. Like other torrent minnows, Psilorhynchus kosygini is adapted to cling to surfaces in strong currents, allowing it to feed on small invertebrates and organic matter.
Experts say the discoveries of Garra zubzaensis and Psilorhynchus kosygini also emphasize the need for conservation efforts to protect these fragile habitats.
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