Kebede, Asfaw Alemayehu (2011) Effect of Feed Quality on Growth Performance and Water Quality in Cage Culture System for Production of Nile Tilapia [Oreochromis niloticus, (Linnaeus, 1758)] in Lake Hora-Arsedi, Ethiopia. Masters thesis, Addis Ababa University.
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Abstract
Six months (Jun 7 to November 22/ 2010) feeding trial was conducted to investigate the effects of feed quality on growth performance and water quality in cage culture system of mixed-sex Nile tilapia (Oreochromis niloticus) in Lake Hora-Arsedi using fifteen suspended 1 m3 net cages. The initial length and weight of the fish ranged from 119.32 ± 1.44 to 125.00 ± 1.50 mm and 42.80 ± 2.53 to 43.51 ± 2.36 gm, (mean ± SD), respectively. Fish diets were prepared from three kinds of locally available plant protein source feeds, i.e. oil seed cake (O), mill sweeping (M), and rice bran (R). In all the combination 20% of blood and bone meal (B) was added to increase the crude protein level and supplement growth limiting mineral, phosphorus. Therefore, four combination of feeds were prepared as diet-1 (ROM+B), 22.87% crude protein (CP); diet-2 (RM + B), 22.22% CP; diet-3 (MO+B), 22.00% CP, and diet-4 (RO+B), 24.28% CP). About 26.67% each of plant protein source ingredient was in diet-1, whereas 40% of it in the other combinations. There was a triplicate of control cages in which fishes were provided with only the natural feeds. Each treatment was assigned to triplicates of 100 fish in a completely randomized design along the U-shaped jetty (walkway). The fish were fed sinking extruded feeds, 3% of their body weight, twice a day manually using feeding tray. The results showed significant differences among the test diets. Diet-1 gave the best mean weight gain (MWGs) of 197.38 ± 5.57 followed by diet-3 with MWGs of 182.16 ± 4.12, diet-2 with MWGs of 169.27 ± 6.31. Diet-4 and the control gave MWGs of 146.27 ± 6.82 and 80.62 ± 3.34 gm, respectively. MWGs in treatment fed with diet-1 were significantly higher (P < 0.05) than MWGs of other treatments. Mean DGR ranged from 0.28 for the control treatment to 0.92 for the fish fed with diet-1. Specific growth rate was also highest in the treatment fed diet-1 (0.9%/ fish) and lowest in the control (0.38%/ fish). Food conversion ratio and efficiency were best with diet-1, followed by diet-3 and least with diet-4. Visceral to body weight ratio for the treatment fed with diet-1 was significantly better (P < 0.05) than the values for other treatments. Percentage survival ranged from 80% in the control to 94% in cages fed with diet-1. The study showed that diet-1 can be effectively used in the diet of O. niloticus and also in terms of cost it sees more efficient than other followed by diet-3. This study also showed that the feeds did not bring any effect on water quality at least in experimental level.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Economic analysis, feed conversion, mill sweeping, rice bran, oil seed cake |
| Subjects: | Q Science > QH Natural history > QH301 Biology Q Science > QL Zoology S Agriculture > S Agriculture (General) S Agriculture > SF Animal culture |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 24 Aug 2018 12:46 |
| Last Modified: | 24 Aug 2018 12:46 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4863 |
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