Peacock Goby

The Peacock Goby (Tateurndina ocellicauda) is a small freshwater fish in the sleeper goby family Eleotridae, native to lowland streams and swamps of Papua New Guinea. Despite its common name, it is not a true goby (family Gobiidae) but belongs to the closely related sleeper goby group, which lacks the fused pelvic-fin sucker disc of true gobies. Peacock Goby are prized in the aquarium hobby for their vivid coloration and peaceful temperament. The species remains common within its limited native range in Papua New Guinea and is not considered threatened.

Peacock Goby are small, plump-bodied fish reaching only 5-8 cm, with a rounded head and body covered in iridescent blue spots over a base color ranging from orange to purplish-brown.

Distinguishing features:

• Compact, rounded body shape rather than the elongated form of true gobies
• Numerous small, shimmering blue-green spots across the body and fins
• Tall, rounded dorsal and anal fins, often edged in color
• A distinct dark eye-like spot (ocellus) near the base of the tail, giving rise to the species name ocellicauda
• Large, prominent eyes

Males typically show brighter coloration and a more pronounced forehead hump than females, useful for distinguishing sexes.

Peacock Goby are native to Papua New Guinea, where they inhabit slow-moving lowland streams, swamps, and forest pools. They favor still or gently flowing, well-vegetated freshwater with soft substrate and plenty of cover from leaf litter, roots, and aquatic plants. Peacock Goby prefer warm, tropical water conditions typical of their equatorial range and are generally found in shaded, densely vegetated habitats rather than open water, often in small, isolated forest pools with limited water flow and dense overhead canopy cover.

Peacock Goby are peaceful, generally non-aggressive fish that spend much of their time hovering or resting near cover rather than actively swimming in open water. They are carnivorous, feeding on small aquatic invertebrates such as insect larvae and crustaceans picked from the substrate and water column. Males become territorial around potential spawning sites, such as caves or crevices, where they perform courtship displays to attract females. Peacock Goby are cave spawners; after eggs are laid on a sheltered surface, the male typically guards and fans the clutch until hatching, showing a degree of parental care typical of many sleeper gobies.