| Title | In-Vivo Evaluation of the Suitability of By-Product-Derived Phosphate Feed Supplements for Use in the Circular Economy, Using Juvenile African Catfish as Model Species |
|---|---|
| ID_Doc | 28290 |
| Authors | Swanepoel, JC; Goosen, NJ |
| Title | In-Vivo Evaluation of the Suitability of By-Product-Derived Phosphate Feed Supplements for Use in the Circular Economy, Using Juvenile African Catfish as Model Species |
| Year | 2022 |
| Published | Waste And Biomass Valorization, 13.0, 11 |
| Abstract | Fish bone by-products from the fish processing industry contain significant amounts of phosphates, which could be utilized as animal feed supplements that substitute conventional mined rock phosphates. The study evaluated whether two by-product derived ingredients (fish bone meal and inorganic dicalcium phosphate extracted from fish bones) could substitute conventional dietary phosphorous sources in formulated diets for African catfish, Clarias gariepinus, and thereby demonstrate a pathway through which these by-products can be valorised and utilized through a circular economy approach. Conventional feed phosphates were 100% substituted by fish bone meal (treatment FB), and 100% and 50% by inorganic dicalcium phosphate (treatments DCP100 and DCP50 respectively). All experimental diets sustained high specific growth rates of 4.83-4.99%.day(-1), without any differences in final animal weight or body condition factor between treatments. Blood serum indicators of non-specific immune function were unaffected by dietary treatment, as were vertebrae mineral content and the Ca:P ratio. Whole body lipid accumulation was found for both diets that substituted 100% of conventional phosphates, but in the absence of other evidence it is unlikely that this indicates decreased dietary phosphorous availability of the ingredients. The study concludes that fish bone meal and inorganic dicalcium phosphate extracted from fish by-products can be a viable alternative dietary source of phosphorous, at least in the case of Clarias gariepinus. It is recommended that future research should include determining economic viability of these ingredients in aquafeeds, on estimating whether these ingredients cause increased environmental impacts relative to conventional mined feed phosphates. [GRAPHICS] . |
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