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Changes in plasma osmolality, cortisol and amino acid levels of tongue sole (Cynoglossus semilaevis) at different salinities

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Abstract

A serial of salinity transferring treatments were performed to investigate the osmoregulation of tongue sole (Cynoglossus semilaevis). Juvenile tongue sole were directly transferred from a salinity of 30 to 0, 10, 20, 30, 40 and 50. Blood sampling was performed for each treatment after 0, 1, 6 and 12 h, as well as after 1, 2, 4, 8, 16 and 32 d. The plasma osmolality, cortisol and free amino acids were assessed. Under the experimental conditions, no fish died after acute salinity transfer. The plasma cortisol level increased 1 h after the abrupt transfer from a salinity of 30 to that of 0, 40 and 50, and decreased from 6 h to 8 d after transfer. Similar trends were observed in the changes of plasma osmolality. The plasma free amino acids concentration showed a ‘U-shaped’ relationship with salinity after being transferred to different salinities for 4 days. More obvious changes of plasma free amino acid concentration occurred under hyper-osmotic conditions than under hypo-osmotic conditions. The concentrations of valine, isoleucine, lysine, glutamic acid, glycine, proline and taurine increased with rising salinity. The plasma levels of threonine, leucine, arginine, serine, and alanine showed a ‘U-shaped’ relationship with salinity. The results of this study suggested that free amino acids might have important effects on osmotic acclimation in tongue sole.

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Authors and Affiliations

  1. Key Laboratory of Mariculture of Ministry of Education, Ocean University of China, Qingdao, 266003, P. R. China

    Guodong Wang, Xiangli Tian, Shuanglin Dong & Ziheng Fang

  2. National Oceanographic Center of Qingdao, Qingdao, 266071, P. R. China

    Kefeng Xu

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  1. Guodong Wang
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  2. Kefeng Xu
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  3. Xiangli Tian
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  4. Shuanglin Dong
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  5. Ziheng Fang
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Correspondence to Xiangli Tian.

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Wang, G., Xu, K., Tian, X. et al. Changes in plasma osmolality, cortisol and amino acid levels of tongue sole (Cynoglossus semilaevis) at different salinities. J. Ocean Univ. China 14, 881–887 (2015). https://doi.org/10.1007/s11802-015-2598-9

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  • DOI: https://doi.org/10.1007/s11802-015-2598-9

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