Licorice Gourami

The Licorice Gourami is a tiny, secretive labyrinth fish native to the blackwater peat swamp forests of Sumatra and neighboring islands in Indonesia. It belongs to the genus Parosphromenus, a group of small, dark-bodied gouramis often collectively called "licorice gouramis" for their deep, licorice-like coloration. The species displays a dark brown to blackish body crossed by one or two iridescent turquoise-blue stripes, with fins delicately edged in red or orange, particularly vivid in breeding males. Adapted to some of the most acidic, tannin-stained freshwater on Earth, it is among the smallest gourami species and is considerably more sensitive to water chemistry than hardier relatives, requiring very soft, acidic conditions to thrive.

• Very small, slender body rarely exceeding 4 cm, dark brown to blackish base color
• One or two iridescent turquoise-blue longitudinal stripes running along the body
• Fins delicately edged in red or orange, most vivid in breeding males
• Overall subdued, dark coloration adapted to dim blackwater habitat, contrasting with the more colorful bands of other small gouramis
• Distinguished from other Parosphromenus species by subtle differences in stripe pattern and fin edge coloration, often requiring close comparison
• Distinguished from the Chocolate Gourami by its much smaller size, darker base color, and thin iridescent striping rather than broad pale bands

Licorice Gouramis are native to the blackwater peat swamp forests of Sumatra and nearby Indonesian islands, some of the most acidic and nutrient-poor freshwater habitats in the world, heavily stained by tannins released from decomposing leaf litter. These waters are typically extremely soft, warm, and dimly lit beneath dense forest canopy. The species is highly specialized for these conditions and does not tolerate harder or more alkaline water well. As labyrinth fish, they can supplement gill respiration with atmospheric air. Populations are considered vulnerable due to widespread destruction and drainage of Southeast Asian peat swamp forest habitat for agriculture, palm oil plantations, and development.

Licorice Gouramis are shy, secretive, and slow-moving, spending most of their time hidden among leaf litter, roots, and dense cover in the dim understory of their blackwater habitat, where they feed on tiny aquatic invertebrates. As labyrinth breathers, they can supplement oxygen uptake by gulping air, though they are less surface-active than many bubble-nesting relatives. Breeding behavior is distinctive: rather than building a bubble nest, males of this genus typically court females into a small cave, crevice, or plant cavity where spawning occurs, after which the male guards the eggs within the cave until they hatch, a strategy suited to the sheltered, structurally complex swamp habitat.