African Sharptooth Catfish

The African Sharptooth Catfish is a large, extremely hardy species native to freshwater habitats across most of Africa and parts of the Middle East. It possesses an accessory breathing organ that lets it gulp air directly, enabling survival in stagnant, oxygen-poor water and short overland movements between water bodies during rains, giving rise to the alternate name 'walking catfish.' Its adaptability and rapid growth have made it a major species in African aquaculture, but the same traits have allowed it to become a damaging invasive species where introduced outside its native range, outcompeting local fish. The elongated, scaleless body, broad flattened head, and eight barbels are characteristic of the genus.

• Long cylindrical, scaleless body with mottled olive-grey to dark brown coloration
• Broad, flattened head with small eyes and a wide terminal mouth
• Eight barbels around the mouth (two pairs long, two pairs short)
• Long-based dorsal and anal fins extending nearly to the tail, no adipose fin
• Sharp, hardened pectoral fin spines
• Similar species: distinguished from other Clarias species by head shape and spine serration patterns; superficially resembles the invasive walking catfish (Clarias batrachus) but generally grows much larger.

Native across most of sub-Saharan Africa and the Middle East, the African Sharptooth Catfish occupies an exceptionally broad range of freshwater habitats, including large rivers, lakes, swamps, seasonal floodplains, and even man-made ponds and irrigation canals. Its accessory air-breathing organ allows it to survive in shallow, muddy, oxygen-depleted water where few other fish can persist, and it can travel short distances over wet ground between isolated pools during rainy seasons. This adaptability has enabled successful establishment in introduced ranges in Asia and elsewhere, where it thrives in disturbed and degraded wetland habitats alongside its native distribution.

An opportunistic omnivore, the African Sharptooth Catfish feeds on fish, insects, crustaceans, plant matter, and detritus, using its barbels to locate food in murky water, often at night. It can tolerate crowded conditions and poor water quality, traits that support its widespread use in aquaculture. During heavy rains, it may migrate overland briefly between water bodies using its sturdy pectoral spines and body undulation for traction. Spawning typically occurs in flooded vegetation during the rainy season, with large numbers of eggs scattered and no parental care afterward. Its rapid growth, tolerance of poor conditions, and generalist diet make it a formidable competitor in ecosystems where it has been introduced.