Crocodile Catfish Discovered in Bahini River

February 13, 2025

The recent identification of the Crocodile Catfish in the Bahini River (a tributary of Brahmaputra) has sparked ecological concerns in Guwahati. This invasive species poses threat to local fish populations and the overall aquatic ecosystem. The State Fishery Department is actively analysing samples to determine the extent of the impact. This discovery marks ongoing issues related to invasive species in Assam’s waterways.

About the Crocodile Catfish

The Crocodile Catfish, scientifically known as Bagarius suchus, is a member of the Sisoridae family.
It is also known as the giant devil catfish, crocodile goonch catfish or Asian giant river catfish.
This species is notable for its size, being one of the largest freshwater catfish in Asia.
It can grow over 1.5 metres long and weigh more than 50 kilograms.
Its body is typically dark brown or black, featuring irregular patches.
The dorsal fin extends nearly the entire length of its back.
The Crocodile Catfish is classified as Near Threatened in IUCN Red List

Habitat and Distribution

Crocodile Catfish are native to freshwater ecosystems in South and Southeast Asia.
Their preferred habitats include deep pools and large rivers with slow to moderate currents.
They are commonly found in the rocky and gravelly substrates of rivers.

Ecological Impact

The introduction of the Crocodile Catfish into the Bahini River raises alarm due to its predatory nature. This species primarily feeds on smaller fish and aquatic organisms, which threatens the native fish populations. The potential for ecological imbalance is high, as the catfish could disrupt the food web and reduce biodiversity.

Pollution Concerns in Local Rivers

The Bharalu River, tributary of the Brahmaputra, is already one of the most polluted rivers in Assam. It suffers from untreated waste disposal from populated areas. The introduction of the Crocodile Catfish in such a compromised ecosystem could exacerbate existing issues.

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