Peacock gudgeon

Geographical Origin and Habitat: The Peacock gudgeon is a small freshwater fish native to the rainforests of eastern Papua New Guinea. It inhabits slow-flowing forest streams, coastal swamps, ponds, and rivers rich in aquatic vegetation, with sandy or muddy substrates covered by fallen branches and decaying leaf litter.

Taxonomy and Morphology: Belonging to the family Eleotridae, Tateurndina ocellicauda features a slender, cylindrical body, relatively large eyes, and two separate dorsal fins. Adults reach a maximum size of approximately 7 centimeters. Males develop a distinct, rounded nuchal hump on their forehead as they mature.

Social Behavior: It is a peaceful, inquisitive, and slow-moving species that spends most of its time swimming near the bottom or middle of the tank. They are suitable for community tanks and can be kept in pairs or small groups. Males display harmless territorial behavior, flaring their fins to compete for caves.

Coloration and Sexual Dimorphism: The coloration is spectacular: a soft blue-gray body covered with rows of bright red spots. The fins are adorned with striking yellow and red borders. A distinct black eyespot (ocellus) is located at the base of the tail. Females are smaller and display a dark margin on their anal fin.

Aquarium Setup: An aquarium of at least 60 liters is recommended. The tank should be densely planted with species like Java moss and Anubias, and include several small caves, coconut shells, or PVC tubes. These are vital for providing security and serve as spawning sites for breeding pairs.

Diet and Feeding: Carnivorous. They prefer live or frozen foods such as bloodworms, daphnia, brine shrimp, and tubifex. They can be stubborn when it comes to accepting dry foods like flakes or pellets, but they can be trained with time and patience. Ensure the food size is small enough for their mouths.

Water Quality: Requires stable parameters: temperature 22°C to 26°C, pH between 6.5 and 7.5, and medium water hardness (GH 5-12). Efficient filtration is necessary, but water flow should be kept low to moderate, as they inhabit slow-moving waters in the wild and dislike strong currents.

Compatibility and Cohabitation: Excellent choice for peaceful community tanks. Ideal tankmates include small rasboras, tetras, Corydoras catfish, dwarf rainbowfish, and other peaceful gobies. Avoid housing with large or aggressive fish that could easily swallow or harass them.

Aquarium Breeding: Breeding in captivity is relatively easy. They are cave spawners. The female deposits eggs inside a cave or tube, and then the male drives her away. The male takes sole responsibility for guarding and fanning the eggs until they hatch, which usually takes about 4 to 6 days.

Risks and Diseases: Generally hardy, but prone to fungal or bacterial infections if water quality declines or if the substrate is dirty. They are also susceptible to internal parasites if fed lower-quality live foods. Providing a varied, sterile frozen diet and clean water prevents most health issues.