...Ian A. Johnston; Marguerite Abercromby; Vera L. A. Vieira; Rakel J. Sigursteindóttir; Bjarni K. Kristjánsson; Dean Sibthorpe; Skúli Skúlason SUMMARY Thingvallavatn, the largest and one of the oldest lakes in Iceland,contains four morphs of Arctic charr Salvelinus alpinus . Dwarf benthic (DB...

...Erik Höglund; Paul H. M. Balm; Svante Winberg SUMMARY In salmonid fish, a darker skin colour has been suggested to signal social subordination. Substratum colour is another factor affecting skin pigmentation in fish; in the present experiment, juvenile Arctic charr ( Salvelinus alpinus ) were...

...Erik Höglund; Paul H. M. Balm; Svante winberg ABSTRACT Arctic charr were allowed to interact in groups of three for 5 days. Skin darkness was quantified by measuring the mean brightness of individual fish before and after social interaction. Brain levels of monoamines and monoamine metabolites...

...Tiina Lecklin; Mikko Nikinmaa ABSTRACT In the present study, we have examined the adrenergic responses of Arctic charr ( Salvelinus alpinus ) erythrocytes acclimated to different temperatures (2, 8 and 14 °C) during different seasons. We measured the changes in cellular water and ion contents after...

...Svante Winberg; Göran E. Nilsson ABSTRACT Binding of [ 3 H]serotonin (5-HT) to membranes prepared from Arctic charr brain homogenates was most consistent with a one-site model for [ 3 H]5-HT binding, with K D and B max values of 5.7±0.3 nmol l −1 and 60.7±7.3 fmol mg −1 protein, respectively...

...Svante Winberg; Göran E. Nilsson ABSTRACT Concentrations of serotonin (5-HT), 5-hydroxyindoleacetic acid (5-HIAA) and tryptophan (TRP, the amino acid precursor of 5-HT) were measured, and 5-HIAA/5-HT ratios calculated, in the telencephalon, hypothalamus and brain stem of Arctic charr ( Salvelinus...

...Svante Winberg; Göran E. Nilsson; Berry M. Spruijt; Urban Höglund ABSTRACT Using a computerized video-image analysis system, spontaneous locomotor activity was measured in dominant and subordinate individuals of Arctic charr ( Salvelinus alpinus ) and in individuals treated with inhibitors...

...Svante Winberg; Göran E. Nilsson; K. Håkan Olsén ABSTRACT The effects of stress and starvation on brain levels of serotonin (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) were studied in Arctic charr (Salvelinus alpinus) . Three experimental protocols were used to elucidate (1) the effect of stress...