湄公鱼

Overview

Mekongina erythrospila combines substantial adult size with potentially strong territorial aggression toward its own kind and similar-looking fish. Its surface-grazing habits should not be confused with those of a harmless algae-only cleaner.

Distribution & habitat

Endemic to the middle and lower Mekong system, it occurs in Laos, Thailand, Cambodia, and Vietnam. Medium to large channels with rocks and fast flow are favored, although deep quieter reaches are used during dry periods. Adults gather in upland rivers with pools, rapids, and flooded forest.

Seasonal movements link feeding floodplains, upstream reproductive habitat, and downstream juvenile growth areas. Dams and intensive fishing interfere with this cycle.

Aquarium setup

Only public displays or exceptionally large specialist aquariums are suitable. Substantial established filtration, ample oxygen, circulation, and strict maintenance are required. Weekly water replacement of about half to seven-tenths is recommended for aquarium care.

Diet & feeding

It scrapes attached biological growth, including algae and other organisms, from solid surfaces. Animal foods remain important: offer worms, brine shrimp, chopped shrimp, and similar fare alongside quality sinking preparations. Some prepared foods should contain substantial vegetable or algal material.

Behaviour & compatibility

Conspecifics and similarly shaped fishes can provoke territorial conflict, especially when space is limited. Planning must account for both adult size and aggression rather than relying on a broad social label.

Sexual dimorphism

Mature females may be deeper-bodied and reach a larger size.

Breeding

Spawning takes place upstream at the beginning of the rainy season. Juveniles descend to main-channel feeding grounds, returning upriver after maturity. Fishing pressure can be concentrated during these movements.