Effects of dietary protein levels and rearing density on growth performance and stress response of Nile tilapia, oreochromis niloticus (L.)
By M. Abdel‐Tawwab. International Aquatic Research, 2012
94 citations recorded by the source corpus.
This study was based on a 3 × 2 factorial design with three levels of dietary protein (25%, 35%, or 45%) and two rearing densities (D 1 = 150 and D 2 = 300 fish/m3). In this study, Nile tilapia, Oreochromis niloticus (L.), (1.8 to 2.5 g) was distributed into the aquaria at a rate of 150 vs. 300 fish/m3. Fish of each density were fed on a diet containing 25%, 35%, or 45% crude protein (CP). Fish were fed on one of the experimental diets till satiation twice daily, 6 days a week, for 10 weeks. At the end of the feeding trial, blood samples were taken to determine the different physiological variables. The growth parameters were positively affected by protein level and inversely affected by stocking density, but there was no effect of their interaction. Final body weight of tilapia, fed with different levels of protein diets, varied at D 1 from 7.1 to 10.1 g and at D 2 from 6.4 to 9.1 g. The best feed conversion ratio was obtained with 45% and 35% CP diets at lower density with insignificant difference. The highest values of protein efficiency ratio and protein productive value were obtained with 25% CP at stock densities of 150 and 300 fish/m3. Moisture and CP contents in the whole-fish body were insignificantly affected by both factors, while ash content was significantly affected by protein level and rearing density. Total lipid content was affected by protein level alone. All physiological variables including activities of aspartate aminotransferase, alanine aminotransferase, total protein, total lipids, and glucose in plasma were significantly affected by dietary protein levels and/or rearing density. The overall results presented here indicate that the best growth performance of Nile tilapia was obtained when the fish fed on the 45% CP diet and were reared at a stocking density of 150 fish/m3.
Subfields: Aquatic Science, Immunology, Physiology
View Paper: https://www.semanticscholar.org/paper/80b40829d07ca388a78407f471b947a995b5fadf
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Citations in the corpus
- Effect of stocking density on growth performance, serum biochemical parameters, and muscle texture properties of genetically improved farm tilapia, Oreochromis niloticus (2018, result): “Similar results were reported in Nile tilapia (Abdel-Tawwab 2012), sea bass and sea bream, Sparus aurata (Roncarati et al. 2006).”
- Dissolved Oxygen Level and Stocking Density Effects on Growth, Feed Utilization, Physiology, and Innate Immunity of Nile Tilapia, Oreochromis niloticus (2014, background): “The negative correlation between fish growth and stocking density has been postulated by a number of authors (Abdel-Tawwab 2012; Ayyat et al. 2011; El-Sayed 2002; Ridha 2006).”