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Volume 15
Issue 12
10.3390/app15126410
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Evaluation of the Inclusion of the Seaweed Ulva lactuca Produced in an Integrated System with Biofloc in the Diet of Juvenile Tilapia Oreochromis niloticus

by
Andrezza Carvalho
1,*,
Larissa Müller
2,
Victor Rosas
3,
Marcelo Borges Tesser
1,
Juliane Ventura-Lima
2,
Gamze Turan
4,
Marcelo Pias
5 and
Luís H. Poersch
1
1
Estação Marinha de Aquacultura, Instituto de Oceanografia, Universidade Federal do Rio Grande—FURG, Rua do Hotel, no. 2, Cassino, Rio Grande 96210-030, RS, Brazil
2
Instituto de Ciências Biológicas (ICB), Universidade Federal de Rio Grande—FURG, Av. Itália, km 8, Carreiros, Rio Grande 96203-900, RS, Brazil
3
Environmental Science Center, Qatar University, Doha P.O. Box 2713, Qatar
4
Aquaculture Department, Fisheries Faculty, Ege University, Bornova 35100, Turkey
5
Centro de Ciencias Computacionais, Universidade Federal do Rio Grande—FURG, Av. Itália, km 8, Carreiros, Rio Grande 96203-900, RS, Brazil
*
Author to whom correspondence should be addressed.
Appl. Sci. 2025, 15(12), 6410; https://doi.org/10.3390/app15126410
Submission received: 20 March 2025 / Revised: 30 May 2025 / Accepted: 4 June 2025 / Published: 6 June 2025
(This article belongs to the Special Issue Advances in Aquatic Animal Nutrition and Aquaculture)
Versions Notes

Abstract

Macroalgae biomass produced in integrated biofloc systems can become a high-quality nutritional product to replace ingredients in the diet of tilapia. This study aimed to evaluate the effects of different concentrations of Ulva lactuca on the performance and antioxidant capacity of Nile tilapia. There were four isoprotein and isolipid diets with 5%, 10%, and 15% macroalgae meal, and a control treatment without macroalgae inclusion. The experiment lasted for 42 days in a recirculating system, with animal performance, blood sampling, and proximal composition being carried out. To assess the potential benefits of including algal biomass, a salinity stress test was carried out on the fish, and samples were collected for biochemical analysis. There were no significant differences in carcass performance and composition between the treatments. The results showed that the inclusion of 10% macroalgae resulted in a higher granulocyte count, while the antioxidant capacity obtained better results in the 5 and 10% macroalgae inclusions, followed by the modulation of the antioxidant system, as evidenced by an increase in glutathione-S-transferase activity and reduced glutathione levels. However, protein and lipid oxidation did not occur only in the 5% macroalgae inclusion compared with the treatments with higher algae inclusion. Therefore, the inclusion of 5% macroalgae in the tilapia diet is indicated to improve antioxidant capacity in the face of stress.
Keywords: biocompounds; macroalgae; diet; stress; antioxidant biocompounds; macroalgae; diet; stress; antioxidant

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MDPI and ACS Style

Carvalho, A.; Müller, L.; Rosas, V.; Tesser, M.B.; Ventura-Lima, J.; Turan, G.; Pias, M.; Poersch, L.H. Evaluation of the Inclusion of the Seaweed Ulva lactuca Produced in an Integrated System with Biofloc in the Diet of Juvenile Tilapia Oreochromis niloticus. Appl. Sci. 2025, 15, 6410. https://doi.org/10.3390/app15126410

AMA Style

Carvalho A, Müller L, Rosas V, Tesser MB, Ventura-Lima J, Turan G, Pias M, Poersch LH. Evaluation of the Inclusion of the Seaweed Ulva lactuca Produced in an Integrated System with Biofloc in the Diet of Juvenile Tilapia Oreochromis niloticus. Applied Sciences. 2025; 15(12):6410. https://doi.org/10.3390/app15126410

Chicago/Turabian Style

Carvalho, Andrezza, Larissa Müller, Victor Rosas, Marcelo Borges Tesser, Juliane Ventura-Lima, Gamze Turan, Marcelo Pias, and Luís H. Poersch. 2025. "Evaluation of the Inclusion of the Seaweed Ulva lactuca Produced in an Integrated System with Biofloc in the Diet of Juvenile Tilapia Oreochromis niloticus" Applied Sciences 15, no. 12: 6410. https://doi.org/10.3390/app15126410

APA Style

Carvalho, A., Müller, L., Rosas, V., Tesser, M. B., Ventura-Lima, J., Turan, G., Pias, M., & Poersch, L. H. (2025). Evaluation of the Inclusion of the Seaweed Ulva lactuca Produced in an Integrated System with Biofloc in the Diet of Juvenile Tilapia Oreochromis niloticus. Applied Sciences, 15(12), 6410. https://doi.org/10.3390/app15126410

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