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Mayer I, Borg B, Plisetskaya EM. Plasma levels of insulin and liver glycogen contents in one- and two-year old Atlantic salmon (Salmo salar L.) during the period of parr-smolt transformation. Fish Physiol Biochem. 1994;13(3):191-7doi: 10.1007/BF00004357.
Mayer, I., Borg, B., & Plisetskaya, E. M. (1994). Plasma levels of insulin and liver glycogen contents in one- and two-year old Atlantic salmon (Salmo salar L.) during the period of parr-smolt transformation. Fish physiology and biochemistry, 13(3), 191-7. https://doi.org/10.1007/BF00004357
Mayer, I, et al. "Plasma levels of insulin and liver glycogen contents in one- and two-year old Atlantic salmon (Salmo salar L.) during the period of parr-smolt transformation." Fish physiology and biochemistry vol. 13,3 (1994): 191-7. doi: https://doi.org/10.1007/BF00004357
Mayer I, Borg B, Plisetskaya EM. Plasma levels of insulin and liver glycogen contents in one- and two-year old Atlantic salmon (Salmo salar L.) during the period of parr-smolt transformation. Fish Physiol Biochem. 1994 Jul;13(3):191-7. doi: 10.1007/BF00004357. PMID: 24198189.
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Fish Physiol Biochem. 1994 Jul;13(3):191-7. doi: 10.1007/BF00004357.

Plasma levels of insulin and liver glycogen contents in one- and two-year old Atlantic salmon (Salmo salar L.) during the period of parr-smolt transformation.

Fish physiology and biochemistry

I Mayer, B Borg, E M Plisetskaya

Affiliations

  1. Department of Zoology, University of Stockholm, S-106 91, Stockholm, Sweden.

PMID: 24198189 DOI: 10.1007/BF00004357

Abstract

Plasma levels of insulin were measured by specific radioimmunoassay in 1-year and 2-year old Atlantic salmon (Salmo salar) parr during the period of parr-smolt transformation. The two-year old fish were of two different categories; silvering pre-smolts and previously mature male parr. If insulin plays an important role in parr-smolt transformation and/or subsequent osmoregulatory changes it was expected that the pre-smolts would show a different insulin profile compared to the mature male parr and one-year old parr, both of which show impaired hypoosmoregulatory ability compared to smolts. Measurements were taken during two separate years. Between January and April both categories of two-year old fish had generally higher plasma levels of insulin compared to the non-smolting one-year old parr. In the pre-smolts insulin levels ranged from 4.0 to 7.9 ng ml(-1), and from 7.8 to 16.7 ng ml(-1) in 1990 and 1992 respectively, while in the previously mature males the same respective values were from 4.3 to 10.0 ng ml(-1), and from 6.6 to 24.1 ng ml(-1). In the two-year old fish, whether pre-smolts or mature males, plasma insulin levels peaked between 1-2 months before final smoltification, after which insulin titers declined sharply. In 1990, the 1-year old parr showed a dual peak in plasma insulin. Insulin first peaked in February (7.8 ng ml(-1)), and then again in April-May (7.7 ng ml(-1)), while in 1992 the 1-year old parr showed a number of smaller transient peaks (5-7 ng ml(-1)) between March-May, followed by sharp elevation of insulin levels in June. Liver glycogen contents were at their highest (3.5-5.0 g 100 g(-1) I liver wet weight) in March in both 1-year and 2-year old fish. Glycogen levels were low during the later stages of parr-smolt transformation, before rising again in June in both the 1-year old and precociously mature parr, but not in the smolts.

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