Acknowledgments
We are grateful to all members of the Joint Ethiopian–Russian Biological Expedition (JERBE), who participated in our field operations (S. E. Cherenkov, Y. Y. Dgebuadze, Genanaw Tesfaye, Fekadu Tefera, M. V. Mina, I. S. Razgon, and S. A. Simanovsky), and especially to JERBE coordinator Dr. A. A. Darkov for his permanent and invaluable aid. We are grateful to S. E. Cherenkov for photographing the fish as well as to Y. Y. Dgebuadze and M. V. Mina for discussion of unpublished results. The study was supported by the Russian Science Foundation (grant no. 19-14-00218 - field work, morphology, diet, stable isotopes, and partially genetics) and by Ministry of Science and Higher Education of the Russian Federation (grant no. 075-15-2021-1069 – genetics) Financial support (to AM) from the DFG (German Science Foundation) is acknowledged.