Mastacembelus erythrotaenia, commonly known as the Fire Eel, is a striking freshwater fish native to Southeast Asia. It inhabits slow-moving rivers and streams, thriving in muddy substrates. This eel-like fish is known for its elongated body and vivid red and yellow stripes. It is nocturnal, exploring its environment with a pointed snout and keen sense of smell. As a bottom-dweller, it plays a crucial role in the ecosystem by controlling insect larvae populations.

Mastacembelus erythrotaenia, commonly known as the fire eel, is native to Southeast Asia. It is found in the river basins of Thailand, Malaysia, Indonesia (Sumatra, Borneo, and Java), and Vietnam.

The fire eel inhabits freshwater environments, primarily large rivers, streams, and floodplains. These areas are often characterized by slow-moving or still waters with muddy or sandy substrates. The water temperature in their habitat typically ranges from 24°C to 28°C (75°F to 82°F), with a neutral to slightly acidic pH.

Fire eels are benthic creatures, meaning they live near the bottom of water bodies. They are nocturnal and prefer hiding among debris, submerged vegetation, or muddy substrates during the day. Their elongated bodies allow them to navigate through crevices and dense aquatic vegetation, where they primarily feed on invertebrates and small fish. The fire eel plays a role as both predator and prey within its ecosystem, contributing to the control of invertebrate populations and serving as food for larger fish and aquatic mammals.