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In situ chelation of phosphorus using microencapsulated aluminum and iron sulfate to bind intestinal phosphorus in rainbow trout (Oncorhynchus mykiss)

Waly Ndianco Ndiaye, Marie-Hélène Deschamps, Yves Comeau, Kabir Chowdhury, Jean-Daniel Bunod, Marie-Pierre Letourneau-Montminy and Grant Vandenberg

Article (2020)

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Cite this document: Ndiaye, W. N., Deschamps, M.-H., Comeau, Y., Chowdhury, K., Bunod, J.-D., Letourneau-Montminy, M.-P. & Vandenberg, G. (2020). In situ chelation of phosphorus using microencapsulated aluminum and iron sulfate to bind intestinal phosphorus in rainbow trout (Oncorhynchus mykiss). Animal Feed Science and Technology, 269. doi:10.1016/j.anifeedsci.2020.114675
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Excess phosphorus (P) in freshwater ecosystems increases primary production which, left uncontrolled, may lead to eutrophication, accelerating the ageing process of receiving water bodies. To limit phosphorus release resulting from freshwater aquaculture, we propose to incorporate microencapsulated P-chelating agents into fish diets. In a first trial, alum (Al2SO4) and ferrous sulfate (FeSO4) were encapsulated by spray-chilling in a hydrogenated lipid matrix. Two practical diets incorporating one of these two chelating elements (6 g/kg) were fed to fish for five weeks (w), and P release from resulting feces was compared. In a second trial, a similar approach was used to evaluate the impact of increasing supplementation of encapsulated alum (3, 6, 15 g/kg of diet). Feces from the fish fed with the diets incorporating alum and ferrous sulfate released 62 % and 54 % respectively less P than feces from fish fed with control diets. The second experiment revealed a negative correlation between the level of encapsulated Al2SO4 included in the diet and phosphorus released by the feces (y = 0.18x2 ˗ 4.78x + 62.7; R2 = 0.93). Feces from feed incorporating Al2SO4 at 0, 3, 6 and 15 g/kg released 62 %, 52 %, 39 %, and 32 % of the total fecal P after 14 days respectively. Fish fed encapsulated Al2SO4 have similar growth performance and mineral status. Incorporation of encapsulated P-chelating agents into fish feed offers an opportunity to manage P release from fish feces. Long-term feeding studies are required for validation of dietary Al2SO4 and FeSO4 impacts on potential toxicity and growth/environmental performance following chronic feeding of encapulated P chelating agents.

Uncontrolled Keywords

Fish farming; Pollution; Phosphorus solubilization; Encapsulating; Ferrous sulfateAlum

Open Access document in PolyPublie
Subjects: 1000 Génie civil > 1000 Génie civil
1000 Génie civil > 1006 Génie hydrologique
Department: Département des génies civil, géologique et des mines
Research Center: Non applicable
Funders: Ministère de l'Agriculture, des Pêcheries et de l'Alimentation-INNOVAMER (MAPAQ), Ressources Aquatiques Québec (RAQ), Canadian Francophonie Scholaship Program
Date Deposited: 12 Aug 2021 15:24
Last Modified: 16 Sep 2021 01:15
PolyPublie URL: https://publications.polymtl.ca/9082/
Document issued by the official publisher
Journal Title: Animal Feed Science and Technology (vol. 269)
Publisher: Elsevier
Official URL: https://doi.org/10.1016/j.anifeedsci.2020.114675


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