The vundu (Heterobranchus longifilis) is a species of large airbreathing catfish found widely in rivers and other freshwater habitats of sub-Saharan Africa, as well as the Nile.

[3] The vundu is the largest true freshwater fish in southern Africa, reaching up to 1.5 m (5 ft) in length and 55 kg (121 lb) in weight.

[2] (Bull sharks are also found in southern Africa and reach a larger size, but occur in both fresh and saltwater.)

In aquaculture, it is sometimes hybridized with another very large species, the African sharptooth catfish (Clarias gariepinus), resulting in offspring known as "Hetero-clarias".

[6] The vundu eating habits affect many aspects of their lives; their growth, feeding efficiency, and body mineral composition.