Asterophysus batrachus, commonly known as the Gulper Catfish, is native to the freshwater rivers of South America. It is recognized for its large mouth and the ability to consume prey nearly as big as itself. This nocturnal predator is known for its voracious appetite and unique gulping feeding behavior.

Asterophysus batrachus, commonly known as the Gulper Catfish, is native to the South American continent. It is primarily found in the Orinoco and Rio Negro river basins, which span Venezuela, Brazil, and Colombia.

The Gulper Catfish typically inhabits freshwater environments with slow-moving rivers and streams. These areas are characterized by warm tropical climates, with water temperatures ranging from 24°C to 28°C (75°F to 82°F). The water is often soft and acidic, with a pH between 5.5 and 7.0.

Asterophysus batrachus is a benthic and nocturnal predator, often found in areas with dense vegetation and submerged structures, which provide cover and hunting grounds. It feeds primarily on smaller fish and invertebrates, utilizing its large mouth to engulf prey. The species is well adapted to its niche, with a body shape that allows it to remain undetected by both prey and predators.