The Optimal Stocking Density for Nile Tilapia (Oreochromis niloticus) Rearing under Different Stocking Sizes | ||||
| Damietta Journal of Agricultural Sciences | ||||
| Volume 3, Issue 2, July 2024, Page 105-121 PDF (1.19 MB) | ||||
| Document Type: Original research papers | ||||
| DOI: 10.21608/djas.2024.406870 | ||||
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| Authors | ||||
Mayyar El-hanaf1; Mahmoud Salem2; Ahmed Fath El-Bab  1
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| 1Animal, Poultry and Fish Production Department, Faculty of Agriculture, Damietta University, Egypt | ||||
| 2Aquaculture Research Unit. Sakha, Central Lab, of Aquaculture Research, Agriculture Research Center, Egypt. | ||||
| Abstract | ||||
| This experiment was designed to study the main effect of stocking size and stocking density levels and their interactions on growth performance, feed utilization, proximate chemical analysis of whole-body fish, some biochemical, hematological parameters, and liver function, of Nile tilapia (Oreochromis niloticus) fingerlings. All stocked fingerlings in enclosures (hapas) were cultured for 84 days. A (2 × 3) factorial design involved a total of 240 fingerlings of two different stocking sizes – beginning weight (5.94±0.70g and 20.90±0.91g) that were stocked at three different stocking densities (5, 10 and 15 fish/m3 ), respectively in twelve enclosures (hapas 1×2×1 m - 2m3 ) (duplicated for each). At the end of this experiment, the results indicated that final BW, (WG, ADG, SGR, RGR) and feed utilization (FCR and PER) of fish increased with increasing stocking size. The stocking size 20.90 gm (W2) released the highest significantly (P<0.05) BW compared with the stocking size 5.94 gm (W1) fish groups. The final BW of O. niloticus increased with the decrease of stocking density levels, thus fish at stocking density 5 fish/m3 (S1) showed the highest BW compared to the other two fish groups 10 and 15 fish/m3 . With regard to the effect of interaction between stocking size and stocking density on final BW, the highest final BW was recorded by fish (T4) while the lowest one was shown by fish in (T3). Chemical composition, RBCs, WBC, Hb, Tch ALT, and AST of O. niloticus were not affected by the two stocking sizes 5.94 and 20.90 g and the differences between the two groups were not significant While, these measurements were affected by stocking density levels (P>0.05). | ||||
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