Research Article
The Growth Performance of Nile Tilapia in Earthen Ponds Located at Different Altitudes of Toke Kutaye Woreda, Ethiopia ![](https://aquapublisher.com/templates/images/OA.gif)
2 Department of Zoological sciences, Addis Ababa University, Ethiopia
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International Journal of Aquaculture, 2015, Vol. 5, No. 34 doi: 10.5376/ija.2015.05.0034
Received: 09 Oct., 2015 Accepted: 24 Nov., 2015 Published: 18 Jan., 2016
Dereje D., Devi L.P., Sreenivasa V., and Abebe G, 2015, The growth performance of Nile Tilapia in earthen ponds located at different altitudes of Toke Kutaye Woreda, Ethiopia, International Journal of Aquaculture, 5(35): 1-7
Figure 1 Map of Toke Kutaye Woreda (Woreda Agricultural and Rural development office, 2011) |
The study was conducted in three earthen ponds (110 m2 each) located at the altitudes of 2,500 msl (P1), 2,100 msl (P2) and 1,710 msl (P3) respectively. The pond bottoms were prepared and treated with lime for 15 days followed by fertilizing with cow dung (1 kg dry weight/m2/week) and filled with water up to 75 cm depth. Tilapia fingerlings with known initial body length and weight were introduced (2 fingerlings/m2) in to the ponds. Supplementary feed (75% wheat bran and 25% noug cake) was given at the rate of 3% of body weight. The different growth parameters were measured by following standard methods (Desilva and Anderson,1995).Water samples were collected every fortnight for the estimation of physico-chemical parameters following standard procedures(Strickland and Parsons, 1972; Trivedi and Goel, 1984). The nitrate and total phosphorus content were determined following the spectrophotometric method(Tandon, 1993; Olsen et al., 1954). Water samples were collected using a 5 liter Schindler-Patalas water sampler and filtered through a 20µm bolting silk net and preserved with Lugol's solution for enumeration of phytoplankton by using identification keys (Whitford and Schumacher, 1973; Green, 1986, Talling, 1987). Abundance of plankton population was estimated as individual m-3 following the method of (Edmondson and Winberg, 1971).
Table 1 Body length (cm) (mean ± SE) of Nile tilapia fingerlings in different ponds |
Table 2 Body weight (gm) (mean ± SE) of Nile tilapia fingerlings in different ponds |
3.1.1 Average body weight gain
Table 3 Body weight gain (gm/individual fish) (mean ± SE) of Nile tilapia fingerlings |
3.1.2 Specific growth rate (SGR)
Table 4 Specific growth rate (% /day/fish) (mean ± SE) of Nile tilapia fingerlings |
3.2 Physico-chemical parameters
Table 5 Water temperature (oC) (mean±SE) recorded in each experimental altitude during the experimental period |
3.2.2 Nitrate and phosphate
Table 6 Nitrate and Total phosphorus in the pond water (mean±SE) |
3.2.3 Plankton
Figure 2 Percentage composition of Phytoplankton in Pond1 |
Figure 3 Percentage composition of Phytoplankton in Pond 2 |
Figure 4 Percentage composition of Phytoplankton in Pond 3 |
3.2.4 Zooplankton abundance
Figure 5 Zooplankton abundance in P1 |
Figure 6 Zooplankton abundance in P2 |
Figure 7 Zooplankton abundance in P3 |
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. Dereje D.
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. Sreenivasa V.
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. Abebe G.
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