Optimization and Efficiency in Rainbow Trout Fed Diets for Reduce the Environment Impact in Morocco
Journal Title: Universal Journal of Environmental Research and Technology - Year 2013, Vol 3, Issue 2
Abstract
A 60 days field trial was conducted in a private fish farm. The trial was conducted at two circular tanks , in order to investigate the effect of extruded and pelleted fish diet on the growth performance and their impacts on environment of rainbow trout (Oncorhynchus mykiss) . The groups of rainbow trout at average initial weights of 474 g . Following this study, two diets were formulated: the extruded food with 42% crude protein, 28% fat and 17% carbohydrate while the pressed food with 44.7% Crude Protein, 15% fat and 28.6 carbohydrates with digestible energy of 20.9 Mj and 16.48 Mj.Within a 60 day-experiment, significant variation in weight gain and SGR are recorded between the extruded and the pelleted diet. . The best conversion rate was obtained with the extruded food with 1.17 v.s 1.56. The extruded feed emits less nitrogen by the effect of the protein-sparing as we also note this food contains less phosphate that releases phosphate discharges decreased by fish.
Authors and Affiliations
Aba Mustapha, Belghyti Driss, Elkharrim Khadija, Benabid Mohammed
Keywords
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