UKA, A., and F.D. SIKOKI. “EFFECT OF HATCHERY LIGHT CONDITION ON SPAWNING AND EARLY DEVELOPMENT OF Tilapia Guineensis”. Nigerian Journal of Fisheries, vol. 10, no. 1_2, June 2013, pp. 613-7, https://fisonjournal.org.ng/index.php/njf/article/view/233.