Abstract
The effects of different environmental salinities (0, 12, 40, and 55 ppt) on pepsinogen 2 (pga2), trypsinogen 2 (try2), chymotrypsinogen (ctr), and pancreatic alpha-amylase (amy2a) gene expression, and on the total activities of their corresponding enzymes, were assessed in Chelon labrosus juveniles, after their corresponding full-complementary DNA sequences were cloned. Furthermore, the quantitative effect of different salinities on the hydrolysis of feed protein by fish digestive enzymes was evaluated using an in vitro system. Relative pga2 expression levels were significantly higher in animals maintained at 12 ppt, while a significantly higher gene expression level for ctr and try2 was observed at 40 ppt. amy2a gene expression showed its maximum level at 40 ppt and the lowest at 55 ppt. A significant reduction in the activity of amylase with the increase in salinity was observed, whereas the maximum activity for alkaline proteases was observed in individuals maintained at 40 ppt. A negative effect of high salinity on the action of proteases was confirmed by the in vitro assay, indicating a decreased efficiency in the digestive function in C. labrosus when maintained at high environmental salinities. Nevertheless, individuals can live under different environmental salinities, even though gene expression is different and the enzymatic activities are not maintained at the highest studied salinity. Therefore, compensatory mechanisms should be in place. Results are discussed on the light of the importance as a new species for aquaculture.
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Acknowledgements
The authors want to thank the “Estero Leocadia” (Cádiz, Spain) for providing the experimental fish. Experiment has been carried out at the Campus de Excelencia Internacional del Mar (CEI·MAR) facilities from the University of Cádiz.
Funding
This work was funded by project AGL2010-14876 from MICINN to JMM.
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Pujante, I.M., Moyano, F.J., Martos-Sitcha, J.A. et al. Effect of different salinities on gene expression and activity of digestive enzymes in the thick-lipped grey mullet (Chelon labrosus). Fish Physiol Biochem 44, 349–373 (2018). https://doi.org/10.1007/s10695-017-0440-6
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DOI: https://doi.org/10.1007/s10695-017-0440-6