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Effect of dietary administration of kappa carrageenan extracted from Hypnea musciformis on innate immune response, growth, and survival of Nile tilapia (Oreochromis niloticus)

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Abstract

Immune stimulants are an alternative to antibiotic use and contribute to disease prevention in aquaculture. The effect of dietary administration of kappa carrageenan (Kc), extracted from the red algae Hypnea musciformis, in Nile tilapia (Oreochromis niloticus) was assessed by monitoring weight gain after a 15-day feeding trial. Immunostimulation was inferred by the relative expression of transferrin, interleukin 1β (IL-1β), and growth hormone (GH) in the spleen after 24 h and 15 days of daily administration. The toxic activity of Kc was evaluated in brine shrimp (Artemia salina) nauplii. No significant toxic effects of Kc were observed in A. salina at any dose studied. A positive tendency in growth rate and fish survival values was observed when Kc was administered. Correspondingly, GH, transferrin and IL-1 β levels at day 15 post-treatment were higher in the spleens of fish fed with Kc at 5 g kg−1 relative to non-Kc-treated control fish. Feeding Kc extract from H. musciformis to the fish improved nonspecific immunity parameters and increased survival and growth, but further research, including longer-termed studies, should be conducted before recommendation of Kc supplementation in tilapia diets at commercial scale.

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Acknowledgements

The authors acknowledge the Jorge Tadeo Lozano University, Santa Marta Campus, Santa Marta, Colombia, for providing the funding to carry out these experiments (grant: Effect of native bacteria and kappa carrageenan as immune modulators for Nile tilapia) and the members of GICMOA. We would also like to recognize the support of La Sabana University for data analysis. The authors acknowledge Dr. Michael Hume, Research Biologist, United States Department of Agriculture, Agricultural Research Service, for the contributions in the manuscript.

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Correspondence to L. Villamil.

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The authors declare that they have no conflict of interest.

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Experiments were carried out according to the Laboratory Safety Manual of the participating institutions, Law 84 (National Congress of Colombia, 1989) and National Institutes of Health guide for the care and use of laboratory animals (NIH Publications No. 8023, revised 1978).

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Highlights

• Kappa carrageenan extracted from H. musciformis has immunomodulatory activity in tilapia.

• Dietary supplementation of Kappa carrageenan improves tilapia survival during a challenge with E. tarda.

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Villamil, L., Infante Villamil, S., Rozo, G. et al. Effect of dietary administration of kappa carrageenan extracted from Hypnea musciformis on innate immune response, growth, and survival of Nile tilapia (Oreochromis niloticus). Aquacult Int 27, 53–62 (2019). https://doi.org/10.1007/s10499-018-0306-7

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  • DOI: https://doi.org/10.1007/s10499-018-0306-7

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