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Endocrine growth regulation of adult Atlantic salmon in seawater: The effects of light regime on plasma growth hormone, insulin-like growth factor-I, and insulin levels |
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| Authors: | Ulla Nordgarden Tom Hansen Gro-Ingunn Hemre Anne Sundby Bjrn Thrandur Bjrnsson |
| Institution: | aInstitute of Marine Research, Matre, N-5984 Matredal, Norway bNorwegian School of Veterinary Science, Box 8146, N-0033 Oslo, Norway cFish Endocrinology Laboratory, Department of Zoology/Zoophysiology, Göteborg University, Box 463, S-405 30 Göteborg, Sweden dNIFES, Box 176 Sentrum, N-5804 Bergen, Norway |
| Abstract: | Plasma growth hormone (GH), insulin-like growth factor-I (IGF-I), and insulin were measured in two groups of Salmo salar L. during a one-year study. The fish were reared under either a simulated natural photoperiod (SNP) from January to December or a regime of continuous light from January to June, followed by SNP until December (LL/SNP). Plasma GH levels during spring were low, and lower in the LL/SNP fish (< 0.9 ng ml? 1) than in the SNP fish (> 1.9 ng ml? 1), although the LL/SNP grew better (0.8% per day) than the SNP fish (0.5% per day). Plasma IGF-I levels increased transiently from January (64.7 ng ml? 1) to maximum in late September in the LL/SNP (85.8 ng ml? 1) and in November in the SNP group (87.3 ng ml? 1). The ratio GH:IGF-I was lower in the LL/SNP group during spring when this group grew better than the SNP group. |
| Keywords: | Salmo salar GH IGF-I Insulin Photoperiod Growth |
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