The Peacock Gudgeon (Tateurndina ocellicauda) is a jewel of freshwater aquaria, bringing marine-like color and elegance to the freshwater community tank. Despite being called a gudgeon, it belongs to the sleeper goby family Eleotridae and is native to the slow-moving streams and ponds of Papua New Guinea. Its vivid coloration — bands of electric blue, red, and yellow with a distinctive black eyespot near the caudal fin — makes it one of the most visually striking small freshwater fish available to hobbyists.
Adults reach approximately 7 cm, with males being slightly larger and more colorful than females. Females develop a characteristic yellow belly when in breeding condition. The eyespot near the tail is believed to confuse predators, mimicking an eye and misdirecting strikes away from vital organs.
In the aquarium, the Peacock Gudgeon is peaceful and adaptable, making it suitable for well-planted community tanks alongside other non-aggressive species. It spends time at all levels of the water column, though it frequently rests on surfaces — a typical goby behavior. It is not a strong swimmer and appreciates areas of low to moderate flow.
Breeding is one of this species' greatest appeals. Pairs will spawn in small caves or PVC tubes, with the male guarding the eggs until hatching. The fry are small and require infusoria or commercial fry food initially, transitioning to baby brine shrimp as they grow. Its manageable size, peaceful nature, and captivating appearance make it a top pick for beginner and experienced aquarists alike.
