Aurantiochytrium sp. meal as DHA source in Nile tilapia diet,part I: Growth performance and body composition |
| |
| Authors: | Vitor Augusto Giatti Fernandes Fernando Dutra Brignol Keith Filler James Pettigrew Débora Machado Fracalossi |
| |
| Institution: | 1. Departamento de Aquicultura, Universidade Federal de Santa Catarina (UFSC), Florianópolis, SC, Brazil;2. Alltech, Inc., Nicholsville, Kentucky;3. Pettigrew Research Services, Inc., Champaing, Illinois;4. Débora Machado Fracalossi, Department of Aquaculture, Center for Agrarian Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil. |
| |
| Abstract: | This study evaluated the inclusion of Aurantiochytrium sp. (ALL‐G‐RICH?), a source of docosahexaenoic acid (22:6 n‐3, DHA), in the diet of Nile tilapia and its effect on growth performance indexes and body composition. Fish (initial mean weight 8.35 ± 0.80 g) were fed different dietary inclusion levels of ALL‐G‐RICH?: 0.00, 0.05, 0.10, 0.20, and 0.40 g/kg and a control diet using cod liver oil (CLO), to provide DHA content comparable to the inclusion of 0.10 g/kg ALL‐G‐RICH?. Although there was no significant effect (p > 0.05) on weight gain, specific growth rate, feed conversion, protein retention rate, and proximal body composition, the inclusion of ALL‐G‐RICH? in the Nile tilapia diet influenced positively the fatty acid profile in the body, resulting in a high DHA concentration. CLO‐fed fish accumulated significantly more DHA compared to those fed 0.10 g/kg ALL‐G‐RICH? (p < 0.05). A digestibility trial was also performed for ALL‐G‐RICH with 65.86 g mean‐initial‐weight fish. The digestibility was high for DHA (96.10%); however, it was low for palmitic acid (70.81%). The results show that the inclusion of up to 0.40 g/kg ALL‐G‐RICH? can be used in Nile tilapia diets without impairing growth performance. |
| |
| Keywords: | ALL‐G‐RICH™ Aurantiochytrium sp digestibility fatty acids
Oreochromis niloticus
unsaturated |
|
|
