... migration success. European populations of brown trout ( Salmo trutta ) exhibit partial migration, whereby a portion of the population smoltifies and migrates to the ocean, and the rest remain in their natal stream. This distinct, natural dichotomy of life-history strategies provides an excellent...

..., as well as repeatability of body mass, in young brown trout ( Salmo trutta L.) fed a moderately restricted diet (0.5–0.7% fish mass day –1 ). Metabolism was estimated from measurements of oxygen consumption rate ( ) and repeatability was evaluated four times across a 15-week period. Individual body mass...

... stress in wild-type European brown trout, Salmo trutta . A positive correlation between post-stress cortisol levels and CSI was observed, supporting an association between enhanced cortisol response and myocardial remodeling. In conclusion, post-stress cortisol production correlates with myocardial...

...N. Day; P. J. Butler SUMMARY Adult brown trout ( Salmo trutta ) were acclimatised to and maintained at seasonal temperatures (5°C in winter; 15°C in summer)and acclimated to reversed seasonal temperatures (15°C in winter; 5°C in summer) while exposed to the natural (i.e. seasonally variable...

...Christian Nielsen; Kim Aarestrup; Ulrik Nørum; Steffen S. Madsen SUMMARY The relationship between premigratory gill Na + /K + -ATPase activity, determined at two dates during spring, and future migratory behaviour was investigated using non-lethal gill biopsies and PIT-tagging in wild brown trout...

...Christian K. Tipsmark; Steffen S. Madsen SUMMARY In teleost fish, successful osmoregulation involves controlled ion transport mechanisms in kidney and gill epithelia. In this study, the effect of nitric oxide (NO) on Na + /K + -ATPase was investigated in vitro in these two tissues in brown trout...

...M. W. Beaumont; P. J. Butler; E. W. Taylor SUMMARY The present study was undertaken to answer two questions relating to the exposure of brown trout Salmo trutta to sublethal concentrations of copper and low pH (CLP) for 96h. (1) What is the effect of these pollutants on the rate of oxygen...

...Christian K. Tipsmark; Steffen S. Madsen ABSTRACT The effects of cyclic AMP on Na + /K + -ATPase activity were studied in the gill and kidney of the euryhaline brown trout Salmo trutta using two different experimental approaches. In the first series of experiments, in situ Na + /K + -ATPase...

...M. W. Beaumont; E. W. Taylor; P. J. Butler ABSTRACT Previously, the distribution of ammonia between the intracellular and extracellular compartments has been used to predict a significant depolarisation of the resting membrane potential ( E M ) of white muscle from brown trout ( Salmo trutta...

... the role of insulin and insulin-like growth factor I (IGF-I) in fish adipose tissue function, we have investigated the presence and the regulation of insulin and IGF-I receptors in adipose tissue of brown trout ( Salmo trutta ). Receptors for insulin and IGF-I were detected in trout adipose tissue...

...N. Day; P. J. Butler ABSTRACT Electromyographic recordings show that, for adult brown trout swum up to their critical swimming speed ( U crit ) in a flume at neutral pH, white muscle recruitment occurred when speeds approached 1 body length s −1 (BL s −1 ) and continued to U crit (approximately 2...

...M. W. Beaumont; P. J. Butler; E. W. Taylor ABSTRACT Adult brown trout (300–600 g) were acclimated for 2 weeks to an artificial soft water (Ca 2+ , 50 μ mol l −1 ) and maintained at either 5 °C (October to March) or 15 °C (May to August). Following insertion of a cannula into the dorsal aorta under...

...I. J. Morgan; W. T. W. Potts ABSTRACT Exposure of brown trout ( Salmo trutta ) in fresh water to 0.15 mmol l −1 external thiocyanate for 1 h resulted in a significant decrease in chlorine concentration in the branchial mitochondria-rich (MR) cells from 37 mmol l −1 to 22 mmol l −1...

...I. J. Morgan; W. T. W. Potts; K. Oates ABSTRACT The intracellular concentrations of sodium, chloride, phosphorus and potassium under normal conditions in pavement epithelial (PE) cells of brown trout ( Salmo trutta ) gill were 66, 51, 87 and 88 mmol l −1 respectively. The concentrations...

... temperature brown trout Salmo trutta . Although studies on a range of poikilothermic vertebrates have demonstrated a rise in plasma pH with decreasing temperature, there is much variability in ΔpH/Δ t from −0.001units°C −1 in varanid lizards to −0.021units°C −1 in freshwater turtles (see Heisler...

...P. J. Butler; N. Day ABSTRACT Adult brown trout were acclimated for 2–4 weeks to artificial soft water ([Ca2+] 25 μmol l −1 ) at neutral pH and at summer (15°C) temperature. During this period they swam against a current of approximately 0.25 ms −1 . They then had their dorsal aorta cannulated...

...P. J. Butler; N. Day; K. Namba ABSTRACT Adult brown trout were acclimated for 2–4 weeks to artificial, soft water (Ca 2+ 25 μ mol l -1 ) at neutral pH and at summer (15°C) or winter (5°C) temperatures. During this period they swam against a current of approximately 0.25 ms -1 . They were...