Long-whiskered Catfish

Geographical Origin and Habitat: Mystus gulio is native to South and Southeast Asia, found along the coasts of India, Bangladesh, Myanmar, Thailand, and Malaysia. It primarily inhabits muddy estuaries, brackish lagoons, tidal river mouths, and mangrove swamps.

Taxonomy and Morphology: Belonging to the class Actinopterygii, order Siluriformes, and family Bagridae, under the genus Mystus. It features a scaleless body, a flattened head with four pairs of long sensory barbels, and an adipose fin. It typically grows to 20 cm in captivity.

Social Behavior: Active and schooling when young, becoming more solitary as they mature. They are nocturnal predators and opportunistic feeders. While peaceful toward larger fish, they will prey on any tankmate small enough to fit into their mouth.

Coloration and Sexual Dimorphism: Body is dark greyish-brown or olive on the back, shading to a silver-white belly. The fins are dusky or translucent. Mature females are noticeably rounder, heavier-bodied, and slightly larger than males of the same age.

Aquarium Setup: A minimum tank size of 200 liters is required. Use fine sand or smooth, rounded gravel to protect their delicate sensory barbels from injury. Provide plenty of hiding spaces using large PVC pipes, driftwood, and rocks, with open space for swimming.

Diet and Feeding: Voracious omnivore. Accepts a wide variety of foods including sinking catfish pellets, frozen foods (bloodworms, mysis, brine shrimp), earthworms, and chopped seafood. Feeding should ideally occur in the evening or under dim light.

Water Quality: Best kept in brackish water (specific gravity 1.002 to 1.010), but can adapt to hard freshwater. Keep temperatures between 20°C and 28°C, and pH between 7.0 and 8.2. Strong filtration is essential to handle their high biological load.

Compatibility and Cohabitation: Keep only with larger, active fish that inhabit the middle and upper water columns, such as Scats, Monos, Archerfish, or large brackish livebearers. Avoid small species like tetras or shrimp, which will be consumed.

Aquarium Breeding: Spawning in private aquariums is very rare. They are egg-scatterers. In nature, breeding is triggered by the monsoon season, which brings drops in temperature and salinity; recreating these conditions in captivity is difficult.

Risks and Diseases: The pectoral and dorsal fin spines are sharp and can inflict painful stings; use caution when netting the fish. They are susceptible to skin infections and bacterial diseases if the substrate is coarse or poorly maintained.