_____________________________________________________________________________________________________ *Corresponding author: Email: felixeze8@gmail.com, felix.eze@nmu.edu.ng; Asian Journal of Fisheries and Aquatic Research 11(6): 21-32, 2021; Article no.AJFAR.66141 ISSN: 2582-3760 Morphometric, Meristic and Conditional Factor Characterization of Redbelly Tilapia (Coptodon zillii) in Lake Komadugu, Yobe State, Nigeria Eze Felix 1* , Eyo Victor Oscar 1 and Abraham Oghenemarho Victory 1 1 Department of Fisheries and Aquaculture, Faculty of Marine Environmental Management, Nigeria Maritime University, Okerenkoko, P.M.B. 1005, Delta State, Nigeria. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/AJFAR/2021/v11i630221 Editor(s): (1) Dr. Luis Enrique Ibarra Morales, State University of Sonora, Mexico. (2) Dr. Matheus Ramalho de Lima, Federal University of South of Bahia, Brazil. Reviewers: (1) Gil Martínez Bautista, Universidad Juárez Autónoma de Tabasco, México. (2) Mahunan Tobias Césaire Azon, University of Abomey-Calavi, Benin. (3) Jacek Dołęga, Institute of Nature Conservation, Poland. Complete Peer review History: http://www.sdiarticle4.com/review-history/66141 Received 15 January 2021 Accepted 20 March 2021 Published 06 April 2021 ABSTRACT This research was carried out to study the morphological characteristics of Coptodon zillii from Lake Komadugu in Yobe State, Nigeria using morphometric measurements, meristic counts and length-weight relationship. A total of 60 specimens of Coptodon zillii were purchased from the fisher folks at landing site in Lake Komadugu, examined and analyzed for morphometric and meristic characterization. The results revealed that all the morphometric characters of C. zillii in Lake Komadugu varied whereas some meristic characters including mean number of rays on pectoral fin (8.00 ± 0.00), pelvic fin ray (5.00 ± 0.00), anal fin spine (3.00 ± 0.00), pelvic fin spine (1.00 ± 0.00) and number of lateral line (2.00 ± 0.00) were constant. A significant linear relationship was established and represented by the equation: W =0.008SL 2.097 (r =0.6410 d.f. = 58) for male, W =0.001SL 3.013 (r = 0.9600 d.f. = 58) for female. Mean condition factor which was not significantly different (p>0.05) showed that male C. zillii had 1.80 ± 0.27, female (1.92± 0.26) and pooled sex (1.86 ± 0.25). Findings of this study implies that C. zillii from Lake Original Research Article