A population in the Kisangani region, although closely related, appears to be separate.[12] Similarly, those found in coastal northwestern Africa are genetically quite distinct from the other populations.[2] In the Nile system, it has been observed that populations in its delta, the northern White Nile and lakes near Fayum differ from each other in morphology and colors, but whether this is taxonomically significant is unclear. In contrast, the virtually unknown C. ismailiaensis of northeastern Egypt might only be an aberrant redbelly tilapia; it primarily differs in its unspotted tail.[13]