Clarias gariepinus is one of Africa's most widely farmed fish, with welfare challenges specific to this hardy but air-breathing catfish in intensive pond and tank systems.
African catfish welfare in intensive systems is challenged by stocking densities that, while the species can physiologically survive, cause chronic social stress through constant competitive interaction. The species territorial and predatory behaviour means that very high densities generate persistent aggression and cannibalism. While catfish tolerate poor water quality better than salmonids, prolonged exposure to elevated ammonia and nitrite causes immune suppression and fin damage. Evidence of African catfish learning capacity suggests greater sentience than previously assumed, warranting improved welfare standards in this important African aquaculture species.