Effect of Feed Quality on Growth Performance and Water Quality in Cage Culture System for Production of Nile Tilapia [Oreochromis Niloticus, (L., 1758)] in Lake Babogaya, Ethiopia.

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Addis Ababa University


This research was conducted in Lake Babogaya, Ethiopia, to investigate the effect of feed quality on growth performance and water quality in cage culture system for production of Nile tilapia (Oreochromis niloticus). All the treatments had the same stocking density of 100 fish per m3 cage. Seven different types of test diets (M=T1, D=T2, O=T3, MD=T4, MO=T5, DO=T6, and MDO=T7) were formulated from three locally available diets (M=Mill sweeping, D=Chicken dung, and O=Oil seed cake). The test diets were formulated in a proportion of 100, 50, and 33.3%, respectively. One control group (C) without supplementary diet was used. All treatments including the control group were in duplicate. Mixed sex juveniles with an average weight of 33.62±0.21 g were stocked in all treatments. The fish were fed the test diets at a rate of 3% of their body weight twice per day using feeding trays for 170 days in powder form. The results showed that the growth of Nile tilapia was affected by the quality of the test diets. The final mean weight of O. niloticus ranged from 166.90±1.61 to 242.87±1.97 g and the mean weight gain ranged from 0.79±0.06 to 1.23±0.03 g day-1. The mean feed intake per fish ranged from 2.57 to 3.52 g day-1 while the feed conversion ratio (FCR) ranged from 2.76 to 3.33. Greater FCR for caged tilapia was obtained from T4 and T7 diets with insignificant difference (P > 0.05), while the poorest FCR was obtained from the test diet containing 100% oil seed cake (T3, P < 0.05). There was significant effect of feed quality and culturing periods on condition factor (P <0.05). Water quality parameters were similar (P > 0.05) among the test diets and sampling sites. In conclusion, T4 and T7 treatments were the best diets preferred by Nile tilapia in terms of all the growth parameters in the study and produced the highest growth performance. So chicken dung and mill sweeping should not be used separately to get the maximum fish growth as revealed in T1 (100%), T2 (100%), T4 (50%), and T7 (33.3%). Moreover, oil seed cake can only partially be used as a source of protein in locally formulated diet, at a limited amount of not more than 33.3% as demon



cage culture, chicken dung, feed quality, growth performance, mill sweeping, oil seed cake, Oreochromis niloticus,, Lake Babogaya, water quality.