Sudan

The Arabian toothcarp, Aphaniops dispar, is found around the coasts of the Red Sea and the Gulf of Aden. Inland populations also exist, and it tolerates anything from pure freshwater to hypersaline conditions. A 2003 phylogenetic study found it paraphyletic, and several populations once included in it have since been described as separate species, so forms are labelled by locality, such as 'Lake Assal'.

The widehead catfish, Clarotes laticeps, is a large predatory catfish recorded across much of Africa, from Senegal and Guinea east to Egypt and Kenya. It inhabits large lakes and rivers and grows to 80 cm, though it is unlikely to reach this in captivity. Uncommon in the trade, it is capable of swallowing surprisingly large prey and is unsuitable for all but the biggest aquaria.

The grass carp, Ctenopharyngodon idella, is a large cyprinid native to the Amur River system in eastern Russia and northeastern China. Adults typically reach 800 to 1200 mm, making it a wholly unsuitable aquarium subject, though an albino form is traded. Widely introduced for aquaculture and weed control, it has caused serious damage to natural waters, and unwanted fish should never be released.