Pangasianodon gigas, commonly known as the Mekong giant catfish, is one of the largest freshwater fish species. It inhabits the Mekong River basin in Southeast Asia. Notable for its smooth, scaleless body and large mouth, it can grow up to 3 meters long and weigh over 300 kg. This species is critically endangered due to overfishing and habitat destruction.

Pangasianodon gigas, commonly known as the Mekong giant catfish, is native to the Mekong River Basin in Southeast Asia. This river system spans multiple countries, including Thailand, Laos, Cambodia, and Vietnam.

The Mekong giant catfish inhabits large riverine environments with a preference for deep, slow-moving waters. The species thrives in tropical climates characterized by warm temperatures and seasonal monsoon rains that influence water levels and flow rates.

As a benthopelagic fish, the Mekong giant catfish occupies the middle to lower water column of its habitat. It is primarily a herbivore, feeding on algae and plant matter found along the riverbed. The species plays a critical role in the aquatic ecosystem as a grazer, contributing to the maintenance of the river's ecological balance.