Croaking Gourami

The Croaking Gourami is a small labyrinth fish native to the swamps, ditches, and slow streams of Southeast Asia, including Thailand, Cambodia, Vietnam, Malaysia, and Indonesia. It is best known for its ability to produce an audible croaking or clicking sound, generated by specialized pectoral fin muscles, most often heard during territorial disputes or courtship. The body is slender and elongated, translucent brown in base tone, overlaid with rows of iridescent blue-green spots and stripes that run lengthwise along the flanks, along with reddish-brown mottling. Unlike the larger, more herbivorous gouramis, the Croaking Gourami is primarily a micro-predator, feeding on tiny aquatic invertebrates rather than plant material.

• Small, slender, elongated body, translucent brown to olive base color
• Rows of iridescent blue-green spots and stripes running lengthwise along the flanks
• Reddish-brown mottling scattered across the body and fins
• A dark spot often present near the base of the tail
• Pointed dorsal and anal fins with fine iridescent edging
• Produces an audible croaking sound via modified pectoral fin muscles, a trait shared with its close relative the Sparkling Gourami but at a lower pitch given its larger size

Croaking Gouramis inhabit shallow, still, or slow-moving freshwater habitats across Thailand, Cambodia, Vietnam, Malaysia, and Indonesia, including swamps, ditches, flooded fields, and vegetated slow streams. They favor warm, soft, often acidic water with dense aquatic vegetation, which provides cover for this small species. As labyrinth fish, they are well adapted to low-oxygen conditions typical of stagnant or heavily vegetated shallow water, gulping air at the surface as needed. The species is often found alongside other small blackwater and floodplain fish in densely planted margins of ponds, canals, and rice-growing wetlands throughout its range.

Croaking Gouramis are small, secretive fish that spend much of their time hiding among dense vegetation, emerging to hunt tiny aquatic invertebrates such as insect larvae, small crustaceans, and worms. Their most distinctive behavior is the ability to produce audible croaking or clicking sounds using specialized muscles associated with the pectoral fins, used during territorial disputes between males and as part of courtship. As labyrinth breathers, they regularly surface to gulp air. Males build small bubble nests among plants at the surface and court females with sound and display, after which the male guards the eggs and fry in the nest, chasing off intruders until the young become independent.