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Repeated acute stress reduces growth rate of Atlantic salmon parr and alters plasma levels of growth hormone, insulin-like growth factor I and cortisol

Aquaculture
By: , , , , , , and 
https://doi.org/10.1016/S0044-8486(98)00351-2

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Abstract

Atlantic salmon (Salmo salar) parr were subjected to acute handling stresses and growth-monitored for at least 30 days. In fish stressed twice daily, growth rate in weight was 61% lower than controls after 11 days (1.00 vs. 2.57% day−1) and over a 30 day period it was 50% lower than controls (1.53 vs. 3.07% day−1). In fish stressed once daily, growth rate was 18% lower than controls after 10 days (2.17 vs. 2.63% day−1) and over a 30-day period it was 34% lower than controls (1.71 vs. 2.59% day−1). In fish stressed once daily, food consumption was reduced by 62% and 37% after 17 and 37 days, respectively. At the end of 40 days of acute stress once daily, control and stressed fish were sampled 1 h prior to, 3 and 7 h after a stress event. Plasma growth hormone levels were significantly higher in the stressed group than in the controls prior to and 7 h after stress. Plasma insulin-like growth factor I (IGF-I) levels were higher in the stressed group only 3 and 7 h after stress. Plasma cortisol levels were lower in the stressed group prior to and 3 h after stress. The results indicate that acute stressors decrease growth of Atlantic salmon parr, with increasing frequency of stress having a more rapid and greater effect.

Publication type Article
Publication Subtype Journal Article
Title Repeated acute stress reduces growth rate of Atlantic salmon parr and alters plasma levels of growth hormone, insulin-like growth factor I and cortisol
Series title Aquaculture
DOI 10.1016/S0044-8486(98)00351-2
Volume 168
Issue 1-4
Year Published 1998
Language English
Publisher Elsevier
Contributing office(s) Leetown Science Center
Description 15 p.
First page 221
Last page 235
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