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Total Replacement of Fishmeal by Spirulina ( Arthrospira platensis ) and Its Effect on Growth Performance and Product Quality of African Catfish ( Clarias gariepinus )

Author

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  • Simon Rosenau

    (Department of Animal Science, Georg August University of Goettingen, 37077 Göttingen, Germany)

  • Elisa Oertel

    (Department of Animal Science, Georg August University of Goettingen, 37077 Göttingen, Germany)

  • Carsten Dietz

    (Department of Animal Science, Georg August University of Goettingen, 37077 Göttingen, Germany)

  • Stephan Wessels

    (Department of Animal Science, Georg August University of Goettingen, 37077 Göttingen, Germany)

  • Jens Tetens

    (Department of Animal Science, Georg August University of Goettingen, 37077 Göttingen, Germany
    Center for Integrated Breeding Research, Georg August University of Goettingen, 37075 Göttingen, Germany)

  • Daniel Mörlein

    (Department of Animal Science, Georg August University of Goettingen, 37077 Göttingen, Germany)

  • Marco Ciulu

    (Department of Animal Science, Georg August University of Goettingen, 37077 Göttingen, Germany)

Abstract

Microalgae are increasingly being studied to replace fishmeal in aquafeed production. Low level Spirulina supplementation to various fish species has been widely investigated, demonstrating enhanced growth and better product quality. In order to evaluate the effects of a full fishmeal replacement with Spirulina ( Arthrospira platensis ) on growth and product quality in African catfish ( Clarias gariepinus ), two isoenergetic diets were formulated and fed for ten weeks to 120 fish with an average initial weight of 50 ± 3 g. Full supplementation of Spirulina resulted in reduced growth ( p < 0.001) whereas feed conversion ratio was on par ( p > 0.05). Furthermore, Spirulina-fed fish showed a more intense yellow coloration in skin, and raw and cooked fillet ( p < 0.001). The analysis of fatty acids revealed higher proportions of C16:0 ( p < 0.001) and C18:2n6 ( p < 0.05) in fish fed the Spirulina-diet while C24:0 ( p < 0.01) and C20:5n3 ( p < 0.001) were found to be higher in the control group. Even though no statistically significant differences in the overall SFA, MUFA and PUFA were detected, a slight increase of the n6/n3 ratio was observed in the Spirulina-fed fish. Without further optimization of the feed ration, a complete fishmeal replacement with Spirulina can lead to economic losses. It remains to be studied whether the observed changes in product quality affect consumer acceptance.

Suggested Citation

  • Simon Rosenau & Elisa Oertel & Carsten Dietz & Stephan Wessels & Jens Tetens & Daniel Mörlein & Marco Ciulu, 2021. "Total Replacement of Fishmeal by Spirulina ( Arthrospira platensis ) and Its Effect on Growth Performance and Product Quality of African Catfish ( Clarias gariepinus )," Sustainability, MDPI, vol. 13(16), pages 1-16, August.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:16:p:8726-:d:608565
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    1. Chris D. Thomas & Alison Cameron & Rhys E. Green & Michel Bakkenes & Linda J. Beaumont & Yvonne C. Collingham & Barend F. N. Erasmus & Marinez Ferreira de Siqueira & Alan Grainger & Lee Hannah & Lesle, 2004. "Extinction risk from climate change," Nature, Nature, vol. 427(6970), pages 145-148, January.
    2. John Harte & Annette Ostling & Jessica L. Green & Ann Kinzig, 2004. "Climate change and extinction risk," Nature, Nature, vol. 430(6995), pages 34-34, July.
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    1. Margarita Ramírez-Carmona & Leidy Rendón-Castrillón & Carlos Ocampo-López & Diego Sánchez-Osorno, 2022. "Fish Food Production Using Agro-Industrial Waste Enhanced with Spirulina sp," Sustainability, MDPI, vol. 14(10), pages 1-17, May.

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