New and rare records of fishes from the White Nile in the Republic of the Sudan
During two brief collecting trips on the White Nile in the area of Kosti and Al Jabalayn in April 2016 and March 2018, 82 fish species from 48 genera and 23 families were recorded. During the 2016 survey, major parts of the type series of the just recently described Labeo latebra Moritz & Neumann, 2017 were collected together with an apparently undescribed Haplochromis species from Kosti. Additionally, a marked variance in syntopic Sarotherodon galilaeus (Linnaeus, 1758) populations was observed during both trips: single specimens from Makhaleif and Kosti differ clearly in head contour, overall body shape and colouration pattern compared to standard Nilo-Sudanian Sarotherodon galilaeus commonly occurring in the White Nile and elsewhere. Enteromius macrops (Boulenger, 1911) and Paradistichodus dimidiatus (Pellegrin, 1904) are reported for the first time from the Main Nile Basin and the rarely encountered mormyrid species Cyphomyrus petherici (Boulenger, 1898) and Petrocephalus keatingii Boulenger, 1901, as well as the small mochokid Mochokus brevis Boulenger, 1906 were confirmed for the White Nile.