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Tesfaye, G. and Tadesse, Z. 2013. 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. 7, 2 (Jun. 2013). DOI:https://doi.org/10.4314/ejbs.v7i2.