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Physiology during smoltification in Atlantic salmon: effect of melatonin implants

Journal article
Authors S. O. Handeland
A. K. Imsland
Björn Thrandur Björnsson
S. O. Stefansson
M. Porter
Published in Fish Physiology and Biochemistry
Volume 39
Issue 5
Pages 1079-1088
ISSN 0920-1742
Publication year 2013
Published at Department of Biological and Environmental Sciences
Pages 1079-1088
Language en
Links dx.doi.org/10.1007/s10695-012-9765-...
Keywords Melatonin implant, Growth, Food intake, Growth hormone, Atlantic salmon, TURBOT SCOPHTHALMUS-MAXIMUS, PARR-SMOLT TRANSFORMATION, FACTOR-I, CONCENTRATIONS, GROWTH-HORMONE LEVELS, RAINBOW-TROUT, ONCORHYNCHUS-MYKISS, PLASMA MELATONIN, SALAR L, PHOTOPERIOD, MATURATION, LBOT C, 1983, JOURNAL OF FISH BIOLOGY, V23, P211, CORMICK SD, 1993, CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, V50, P656
Subject categories Biological Sciences

Abstract

Melatonin implants were used to override natural melatonin rhythm in groups of juvenile Atlantic salmon, Salmo salar, raised at simulated natural photoperiod (SNP) and constant light (LL) from mid-March until end of August. The experiment contained also both sham control (with non-melatonin implants) and control (no implants). No differences were found in the experimental variables between these two control groups. Growth and food intake were negatively affected by melatonin implantation. Overall, higher GH levels were observed in the SNP melatonin-implanted group, whereas no differences in GH levels were seen between the SNP control, LL control, or the LL melatonin-implanted groups. Highest food intake was seen in the LL control group. No differences in food intake were recorded between the LL melatonin-implanted and SNP control groups. Gill Na+, K+, ATPase (NKA) activity was influenced by time as well as the interaction between photoperiod and time. No differences in gill NKA activity or plasma chloride levels following transfer to seawater were seen between the groups with melatonin implants and their controls. Based on the present results, it seems apparent that melatonin does play a role in regulating food intake and growth in Atlantic salmon smolts.

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