Effect of dietary phosphorus supplementation on utilization of algae in the grow‐out diet of Nile tilapia Oreochromis niloticus |
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Authors: | Ebtehal El‐Sayed Hussein Konrad Dabrowski Deyab Mohammed Saad Deyab El‐Saidy Bong‐Joo Lee |
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Affiliation: | 1. School of Environment and Natural Resources, The Ohio State University, , Columbus, OH, USA;2. Department of Poultry Production, Minufyia University, , Shebin El‐Kom, Egypt;3. Aquafeed Research Center, National Fisheries Research and Development Institute, , Pohang, Gyeongbuk, South Korea |
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Abstract: | This research involved testing the replacement of corn gluten protein concentrate in the diet of 1.5 g Nile tilapia with biofuel algae‐based or algae supplemented with phosphorus diets. Experimental diets were formulated to replace 50% of the gluten meal protein in the control diet with biofuel algae protein (Alga50) or Spirulina (Spirulina50) protein. In addition, dicalcium phosphate (P) was added to the Alga50 at a concentration of 3.8% or 7.74% to mitigate aluminium (Al) toxicity and designated as Alga50 + P, and Alga50 + PP respectively. After 9 weeks of the feeding experiment, fish fed diets supplemented with P, Alga50 + P and Alga50 + PP differed significantly (P < 0.05) with respect to the feed conversion and protein deposition from the control. The mineral composition of the fish body showed a decrease in levels of Al and iron (Fe) due to the P supplements. The mineral composition of the faeces indicated that Al and Fe were excreted in the faeces and were not accumulated in the fish body. The effect of dicalcium P supplementation on the neutralization of Al in the diet resulted in improved fish growth and histological integrity of the gastrointestinal tract. |
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Keywords: | aluminium biofuel algae Spirulina tilapia phosphorus supplementation |
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