Nile perch
Nile crocodiles are numerous, as is aquatic fauna. There are at least 60 haplochromine cichlid species, as well as a smaller number of other fish species like Lake Victoria sardine and marbled lungfish. Many of the haplochromine cichlids are endemic, but very closely related to the Lake Victoria species, and showing a similar level of diversity in terms of feeding. The Kyoga cichlids include both described species like "Haplochromis latifasciatus" and "H. worthingtoni", and undescribed like "H." sp. "Kyoga flameback" and "H." sp. "ruby". As in Lake Victoria, the Kyoga cichlids have been decimated by the introduced Nile perch and some species are already extinct. Because Kyoga generally is shallow and swampy, some subsections—"satellite lakes"—are isolated to various degrees from the main lake. The number of surviving haplochromine cichlids in each subsection is directly related to the status of the Nile perch. Despite being the largest by far, less than 50 haplochromine species survive in the main section where the Nile perch is common. In comparison, the much smaller satellite lakes Lemwa, Nyaguo and Nawampasa lack Nile perch, but at least 50 haplochromine species survive in each of the first two, and at least 60 in the last. Conversely, the small satellite lakes Nakuwa and Nyasala where Nile perch is abundant have less than 30 and 5 surviving haplochromines respectively. This also means that fishing in the Lake Kyoga system gradually has shifted from once targeting many native species, to now primarily targeting the native Lake Victoria sardine, the introduced Nile perch and introduced Nile tilapia (the two native tilapias, the Singida and Victoria, have become very rare, except in some satellite lakes). In 2006, only 4% of catches were haplochromine cichlids.