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Egyptian Journal of Aquatic Biology and Fisheries
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Ammar, A. (2009). Effect of initial weight and stocking density on growth performance of mono sex nile tilapia reared in semi intensive system. Egyptian Journal of Aquatic Biology and Fisheries, 13(2), 69-80. doi: 10.21608/ejabf.2009.2033
Ayman Ammar. "Effect of initial weight and stocking density on growth performance of mono sex nile tilapia reared in semi intensive system". Egyptian Journal of Aquatic Biology and Fisheries, 13, 2, 2009, 69-80. doi: 10.21608/ejabf.2009.2033
Ammar, A. (2009). 'Effect of initial weight and stocking density on growth performance of mono sex nile tilapia reared in semi intensive system', Egyptian Journal of Aquatic Biology and Fisheries, 13(2), pp. 69-80. doi: 10.21608/ejabf.2009.2033
Ammar, A. Effect of initial weight and stocking density on growth performance of mono sex nile tilapia reared in semi intensive system. Egyptian Journal of Aquatic Biology and Fisheries, 2009; 13(2): 69-80. doi: 10.21608/ejabf.2009.2033

Effect of initial weight and stocking density on growth performance of mono sex nile tilapia reared in semi intensive system

Article 5, Volume 13, Issue 2, April 2009, Page 69-80  XML PDF (46.01 K)
Document Type: Original Article
DOI: 10.21608/ejabf.2009.2033
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Author
Ayman Ammar
Department of Aquaculture, Central Laboratory for Aquaculture Research at Abbassa, Sharkia Governorate, Egypt.
Abstract
The present investigation was carried out at Wady El Raian, Fayoum Governorate, Egypt in order to test the effects of initial weight and stocking density on growth performance and pond productivity of Nile tilapia (Oreochromis niloticus) in semi intensive system. The experiment was carried out in 12 earthen ponds each of a total area of one feddan (4200 m2) to represent six treatment groups in replicates each. The first; second and third two ponds (T1; T2 and T3) were stocked with Nile tilapia fingerlings of an average initial weight of 9.6 g and stocking density 30; 40 and 50 thousands respectively. The second; fourth and sixth tow ponds (T4; T5 and T6) were stocked with Nile tilapia fries of 0.3g and stocking density 30; 40 and 50 thousands respectively. The fish were fed three times daily on a commercial diet containing 27% protein at a rate of 3% of fish biomass. The experiment lasted for 26 weeks from the
start. Results obtained are summarized in the following:
1- Water quality (physical and chemical) lied within the permissible levels
required for optimum growth and development of Nile tilapia.
2- The highest final weight was obtained by T4; T1; T2; followed in a
significant decreasing order by T5; T4 and T6 respectively.
3- Averages of gain in weight; daily gain; specific growth rate and condition
factor were influenced significantly with tilapia initial weight and stocking
density.
4- Total fish production/feddan was the highest for 50 thousand
fingerlings/feddan, stocking density followed by 40 and 30 thousand
fingerlings/feddan.
5- The highest net returns were by the 30 thousand fingerlings/feddan stocking
density (T1) and 40 thousand fingerlings/feddan stocking density (T2) due to the
high contribution of super size and grade 1 fish in the harvest, compared to other
densities and initial weights.
Keywords
Nile tilapia; initial stocking size; stocking density; earthen ponds; monoculture; semi-intensive; Growing period; Growth performance
Main Subjects
Fisheries
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