Abstract
We investigated the effect of two commercial nucleotide products (NT1 and NT2), administered through live feed, on growth and stress tolerance of Atlantic cod larvae. Expression of genes related to muscle growth (igf-1, igf1r, igf-2, fst, fgf6, myod, and myhc) and nucleotide metabolism (uox, hprt, ndk, and uck) was evaluated during larval development. In addition, the expression of genes related to stress (hif-1α, hif-2α, hif-3α, and mb) was studied after an air exposure stress test. The enrichment of rotifers with nucleotides did not reveal any difference in nucleotide profiles, the exception being the RNA level of the NT1-enriched group that was significantly higher than the unenriched rotifer. Unenriched Artemia showed poor nucleotide profiles compared to enriched Artemia since 5′ UMP, 5′ GMP, and 5′ AMP were observed only in the nucleotide groups. At 38 days post-hatch (dph), NT1 group had significantly higher dry weight (3.1 ± 0.1 mg) than the control (CON; 2.3 ± 0.1 mg). The treatments did not produce any significant differences in the expression of the key myogenic genes. Among the genes associated with nucleotide metabolism, ndk was down-regulated in NT1 at 38 dph. In the air exposure test, survival was significantly higher in the CON (77 ± 6 %) than in NT1 (48 ± 3 %) and NT2 (50 ± 3 %). After air exposure, mb was expressed at lower levels in NT2 group, hif-2α was induced in NT1 group, and hif-3α was upregulated in all groups. Our findings indicate that the improvement in the nucleotide profile of Artemia upon nucleotide enrichment could eventuate in the rapid growth of larvae.
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Acknowledgments
The study was funded by the Research Council of Norway, project 182653/V10. The authors appreciate the excellent technical assistance provided by Bjørnar Eggen, Magnus Røkke, and Heidi Ludviksen during live feed production and collection of samples. The support of Rudi Ripman Seim and Odd Elvebø from Biorigin Scandinavia AS, Oslo, Norway, is gratefully acknowledged. Peter Koeppel, Chemoforma Ltd, Augst, Switzerland, is thanked for gifting one of the nucleotide products. The nucleotide analysis of the live feeds was kindly performed by Biorigin Brazil A/S, São Paulo, Brazil. Norwegian Cod Breeding Centre, Tromsø, Norway, supplied the eggs for the study. C.F.C. Lanes is a Ph.D. student supported by funds from Research Council of Norway and University of Nordland.
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Lanes, C.F.C., Bolla, S., Fernandes, J.M.O. et al. Nucleotide Enrichment of Live Feed: A Promising Protocol for Rearing of Atlantic Cod Gadus morhua Larvae. Mar Biotechnol 14, 544–558 (2012). https://doi.org/10.1007/s10126-012-9458-z
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DOI: https://doi.org/10.1007/s10126-012-9458-z