MANIPULATING THE PRODUCTION OF MONO-SEX NILE TILAPIA, OREOCHROMIS NILOTICUS, FRY THROUGH WINTER SEASON | ||
| Egyptian Journal of Nutrition and Feeds | ||
| Article 16, Volume 18, Issue 3, December 2015, Pages 483-495 PDF (601.78 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejnf.2015.105846 | ||
| Author | ||
| W. M.A. Fayed* | ||
| Department of Animal and Fish Production, Faculty of Agriculture (Saba Basha), 22 Tag Al Roasaa st., saba-basha, boulkly, Alexandria University, Alexandria, Egypt | ||
| Abstract | ||
| The influence of low temperature on survival rate and growth performance were compared on native fry of mono-sex Oreochromis niloticus to determine how winter season affects the final biomass and production of fry in Egypt. Six diets containing three protein (30, 35, and 40%) and two energy (370 and 470 kcal ME/100 g) levels were offered to fry (1.03g) to satiation, twice daily, for 6 months. At all protein levels, fry fed low-energy diets (370 kcal ME/100g) revealed poor growth and feed conversion efficiency, survival rates, compared to those fed high-energy (470 kcal ME/100g) diets. At dietary protein levels from 35 to 40% crude protein (CP), fish growth and survival rates were significantly improved by increasing dietary energy from 370 to 470 kcal (ME/100g diet). However, the best growth rate and feed utilization were obtained with 40% CP and 470 kcal (ME/100g diet). Body composition was significantly affected by both dietary protein and energy levels. As such, to overcome the low winter season temperatures the O. niloticus fry requires 40% CP and 470 kcal (ME/100g diet) for maximum growth and best survival rate when reared in earthen ponds in Egypt. | ||
| Keywords | ||
| Mono-sex; Nile tilapia fry; cold tolerance; growth performance; temperature; winter season; production; Oreochromis niloticus | ||
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