Tesfaye, G., and Z. Tadesse. “Length-Weight Relationship, fulton’s Condition Factor and Size at First Maturity of Tilapia, <i>Oreochromis Niloticus</i> L. In Lakes Koka, Ziway and Langano (Ethiopian Rift Valley)”. Ethiopian Journal of Biological Sciences, vol. 7, no. 2, June 2013, doi:10.4314/ejbs.v7i2.