W.Natify, M. Droussi, N. Berday, A. Araba, M. Benabid
Hassan II Institute of Agronomy and Veterinary Medicine, Rabat, Morocco
National Center of Hydrobiology and Fish Culture, Azrou, Morocco
Key words: Ulva lactuca, Fish feed, Oreochromis niloticus, Growth performance, Feed utilization.
The present study investigates the potential of the supplementation of the seaweed Ulva lactuca, as a dietary additive ingredient in fish feed, to improve the Nile tilapia (Oreochromis niloticus) growth performance, feed utilization and carcass composition. The experiment was conducted in the Deroua fish farming facilities (Beni Mellal, Morocco), on male Nile tilapia of a mean weight of 50 ± 1g. Three experimental diets composed of 32% of dietary protein were prepared using dried algae meal ingredient incorporated at levels of 0% (control), 5% and 10% of fish feed. By the end of the experiment, fish growth parameters, feed utilization, somatic indexes and carcass composition were evaluated. Fish fed on 5% seaweed diet tended to have higher growth performance than those fed to the control and 10% seaweed diet (p>0.05). Feed utilization by fish seemed not to be affected by seaweed meal rates change (p>0.05). The viscerosomatic (VSI), hepatosomatic (HSI) and gonadosomatic (GSI) indexes showed no significant difference between diets. Crude protein and crude lipid contents in the fish carcass were not statistically significant (p>0.05), whereas significant differences (p<0.05) in ash content was observed between treatments. In addition, Ulva lactuca meal can be included as supplement ingredient in the diet without impairing growth performance, feed utilization and body composition of Nile Tilapia.
Get the original articles in Source: Volume 7, Number 3, September 2015 – IJAAR
Published By: International Network for Natural Sciences