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Oxidative damage in Nile tilapia, Oreochromis niloticus, is mainly induced by water temperature variation rather than Aurantiochytrium sp. meal dietary supplementation

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Abstract

We investigated whether dietary supplementation with Aurantiochytrium sp. meal, a DHA-rich source (docosahexaenoic acid, 22: 6 n-3), fed during long-term exposure to cold-suboptimal temperature (22 °C, P1), followed by short-term exposure to higher temperatures (28 °C, P2, and 33 °C, P3), would promote oxidative damage in Nile tilapia (Oreochromis niloticus). Two supplementation levels were tested: 1.0 g 100 g−1 (D1) and 4.0 g 100 g−1 (D4). A control diet, without the additive (D0, 0 g 100 g−1), and a positive control diet supplemented with cod liver oil (CLO) were also tested. The concentrations of DHA and total n-3 PUFAs in the CLO diet were similar to those found in diets D1 and D4, respectively. The parameters analyzed included hemoglobin (Hb), the antioxidant enzymes catalase, glutathione peroxidase, total glutathione, non-protein thiols, and the oxidative markers protein carbonyl and erythrocyte DNA damage. Nile tilapia did not present differences in Hb content, regardless of diet composition, but the temperature increase (P1 to P2) led to a higher Hb content. Likewise, the temperature increases promoted alterations in all antioxidant enzymes. The dietary supplementation with 1.0 g 100 g−1 Aurantiochytrium sp. meal after P1 caused minor DNA damage in Nile tilapia, demonstrating that the additive can safely be included in winter diets, despite its high DHA concentration.

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The data from the study will be available through the corresponding author by reasonable request.

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Acknowledgements

The authors would like to thank Alltech Inc. (USA) for funding this study and to the Coordination of Superior Level Staff Improvement (CAPES-Brazil) for granting scholarships to Renata O. Nobrega, Rosana O. Batista, and Bruna Mattioni, and to the National Council for Scientific and Technological Development (CNPq-Brazil) through a fellowship granted to Débora M. Fracalossi. The authors thank Nicoluzzi Rações Ltda (Penha, Santa Catarina, Brazil) and Kabsa Exportadora S.A. (Porto Alegre, Rio Grande do Sul, Brazil) for donating ingredients for the elaboration of the experimental diets. Thanks are also due to Dr. Maria do Carmo Gominho Rosa and Dr. Pitágoras Augusto Piana for assisting with the statistical analyses.

Funding

This work was funded by Alltech Inc. and by the Coordination of Superior Level Staff Improvement (CAPES-Brazil) through scholarships to the authors Renata O. Nobrega, Rosana O. Batista, and Bruna Mattioni, and by the National Council for Scientific and Technological Development (CNPq-Brazil) through a fellowship to Débora M. Fracalossi.

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Contributions

Renata Oselame Nobrega—investigation; methodology; conceptualization; data curation; formal analysis; visualization; writing—original draft; writing—review and editing.

Alcir Luiz Dafre—supervision; methodology; conceptualization; data curation; formal analysis writing: review and editing.

Camila Fernandes Corrêa—supervision; methodology; conceptualization; data curation; writing: review and editing.

Bruna Mattioni—supervision; methodology; conceptualization; data curation; writing: review and editing.

Rosana Oliveira Batista—investigation; conceptualization; methodology; visualization.

James E. Pettigrew—conceptualization; data curation; visualization; writing—review and editing.

Débora Machado Fracalossi—supervision; funding acquisition; methodology; project administration; writing: review and editing.

Corresponding author

Correspondence to Débora Machado Fracalossi.

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Ethics approval

Fish management followed the protocol n° 5665210917, approved by the Ethics Committee of Animal Use of the Federal University of Santa Catarina (CEUA, UFSC, Brazil).

Conflict of interest

The feed additive used in this study was produced and sold by Alltech Inc. (USA) for use in aquaculture diets under the tradename ALL‐G‐RICH™. We understand the issue of conflict of interest and declare: this study was funded by Alltech through a joint research alliance between Alltech and the Universidade Federal de Santa Catarina (UFSC, Brazil). James E. Pettigrew is a consultant of Alltech through a committee containing both Alltech staff and UFSC staff, where the research project was developed and approved.

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Nobrega, R.O., Dafre, A.L., Corrêa, C.F. et al. Oxidative damage in Nile tilapia, Oreochromis niloticus, is mainly induced by water temperature variation rather than Aurantiochytrium sp. meal dietary supplementation. Fish Physiol Biochem 48, 85–99 (2022). https://doi.org/10.1007/s10695-021-01025-5

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