Onumah, E.E., Wessels, S., Wildenhayn, N., Brümmer, B.,  & Schwark, G.H. (2010). Stocking Density and Photoperiod Manipulation in Relation to Estradiol Profile to Enhance Spawning Activity in Female Nile Tilapia. <i>Turkish Journal of Fisheries and Aquatic Sciences</i>, <i>10</i>,  463-470. http://doi.org/10.4194/trjfas.2010.0404