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Effect of salinity on the biosynthesis of n-3 long-chain polyunsaturated fatty acids in silverside Chirostoma estor

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Abstract

The genus Chirostoma (silversides) belongs to the family Atherinopsidae, which contains around 150 species, most of which are marine. However, Mexican silverside (Chirostoma estor) is one of the few representatives of freshwater atherinopsids and is only found in some lakes of the Mexican Central Plateau. However, studies have shown that C. estor has improved survival, growth, and development when cultured in water conditions with increased salinity. In addition, C. estor displays an unusual fatty acid composition for a freshwater fish with high docosahexaenoic acid (DHA)/ eicosapentaenoic acid (EPA) ratios. Freshwater and marine fish species display very different essential fatty acid metabolism and requirements, and so the present study investigated long-chain polyunsaturated fatty acid (LC-PUFA) biosynthesis to determine the capacity of C. estor for endogenous production of EPA and DHA, and the effect that salinity has on these pathways. Briefly, C. estor were maintained at three salinities (0, 5, and 15 ppt), and the metabolism of 14C-labeled 18:3n-3 was determined in isolated hepatocyte and enterocyte cells. The results showed that C. estor has the capacity for endogenous biosynthesis of LC-PUFA from 18-carbon fatty acid precursors, but that the pathway was essentially only active in saline conditions with virtually no activity in cells isolated from fish grown in freshwater. The activity of the LC-PUFA biosynthesis pathway was also higher in cells isolated from fish at 15 ppt compared with fish at 5 ppt. The activity was around fivefold higher in hepatocytes compared with enterocytes; although the majority of 18:3n-3 was converted to 18:4n-3 and 20:4n-3 in hepatocytes, the proportions of 18:3n-3 converted to EPA and DHA were higher in enterocytes. The data were consistent with the hypothesis that conversion of EPA to DHA could contribute, at least in part, to the generally high DHA/EPA ratios observed in the tissue lipids of C. estor.

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Acknowledgments

Dr. Jorge Fonseca-Madrigal was supported by CONACyT, Mexico, with the research grant #61117. Dr. Rodríguez was supported by project CTM2006-14279-C02-02-MAR from Spanish MEC.

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Authors and Affiliations

  1. Laboratorio de Acuicultura, Instituto de Investigaciones Agropecuarias y Forestales, UMSNH, Av. San Juanito Itzícuaro S/N, Col. San Juanito Itzícuaro, C.P. 58330, Morelia, Michoacán, Mexico

    J. Fonseca-Madrigal, D. Pineda-Delgado & C. Martínez-Palacios

  2. Departamento de Biología Animal (U.D.I. Fisiología Animal), Facultad de Biología, Universidad de La Laguna, La Laguna, Tenerife, Spain

    C. Rodríguez

  3. Institute of Aquaculture, University of Stirling, Stirling, UK

    D. R. Tocher

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  1. J. Fonseca-Madrigal
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  2. D. Pineda-Delgado
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  3. C. Martínez-Palacios
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  4. C. Rodríguez
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  5. D. R. Tocher
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Correspondence to J. Fonseca-Madrigal.

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Fonseca-Madrigal, J., Pineda-Delgado, D., Martínez-Palacios, C. et al. Effect of salinity on the biosynthesis of n-3 long-chain polyunsaturated fatty acids in silverside Chirostoma estor . Fish Physiol Biochem 38, 1047–1057 (2012). https://doi.org/10.1007/s10695-011-9589-6

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