Nam Leuk

Devario acrostomus is a devario from the Nam Leuk drainage in Vientiane Province, Laos, and has also been recorded in northeastern Thailand. It first appeared in the hobby in early 2011. It looks like D. aequipinnatus and allies at first glance, but has a sharp, upwardly-pointing mouth, a snout longer than the eye diameter, long rostral barbels and strongly pigmented body patterning. Above Tad Leuk falls its habitats have clear water under forest cover.

The Asian red tailed catfish, Hemibagrus wyckioides, is a bagrid from the Mekong system in China, Laos, Vietnam, Cambodia and Thailand. It also occurs in the Chao Phraya drainage. The largest bagrid in central Indochina, it reaches at least 900–1000 mm and 70–80 kg, and the largest specimen known measured 1300 mm. Juveniles are sometimes sold, but buying them is strongly discouraged given its size, aggression and a lifespan of several decades.

Hemibagrus filamentus is a bagrid catfish from the middle and lower Mekong river system in Laos, Cambodia and Thailand. It appears to be unknown in the aquarium trade but is a valued food fish within its native range, growing to 420 mm SL. It inhabits slowly-flowing or standing waters, including main river channels and lakes, and riverine populations typically migrate into flooded forest during the wet season.