Osmoregulation in Atlantic salmon Salmo salar smolts transferred to seawater at different temperatures

2014 ◽  
Vol 85 (4) ◽  
pp. 1163-1176 ◽  
Author(s):  
S. O. Handeland ◽  
A. K. Imsland ◽  
T. O. Nilsen ◽  
L. O. E. Ebbesson ◽  
C. D. Hosfeld ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
Different Temperatures

Evidence for cumulative temperature as an initiating and terminating factor in downstream migratory behavior of Atlantic salmon (Salmo salar) smolts

2005 ◽  
Vol 62 (1) ◽  
pp. 68-78 ◽  
Author(s):  
Gayle Barbin Zydlewski ◽  
Alex Haro ◽  
Stephen D McCormick
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Behavioral Changes ◽  
Temperature Threshold ◽  
Complete Control ◽  
Atlantic Salmon Salmo Salar ◽  
Different Temperatures ◽  
Nearly Continuous ◽  
Downstream Movement ◽  
Passive Integrated Transponder Tags

Temperature control of Atlantic salmon (Salmo salar) smolt migration was tested using a novel technique allowing nearly continuous monitoring of behavior with complete control over environmental conditions. Parr and presmolts were implanted with passive integrated transponder tags, placed in simulated streams, and monitored for upstream and downstream movements. Beginning 18 April, temperature was increased 1 °C every third day (advanced), fourth day (ambient), and tenth day (delayed). Smolt downstream movements were initially low, peaked in mid-May, and subsequently declined under all conditions. Parr downstream movements were significantly lower than those of smolts in all treatments (0.8 ± 0.5 movement·day–1 versus 26.5 ± 4.5 movements·day–1, mean ± SE) and showed no increase. At delayed temperatures, smolts sustained downstream movements through July; those under ambient and advanced conditions ceased activity by mid-June. Initiation and termination of downstream movements occurred at significantly different temperatures but at the same number of degree-days in all treatments. Physiological changes associated with smolting (gill Na+,K+-ATPase activity and plasma thyroxine) were coincident with behavioral changes. This is the first evidence of a behavioral component to the smolt window. We found that temperature experience over time is more relevant to initiation and termination of downstream movement than a temperature threshold.

Seawater adaptation by out-of-season Atlantic salmon (Salmo salar L.) smolts at different temperatures

Aquaculture ◽  
2000 ◽  
Vol 181 (3-4) ◽  
pp. 377-396 ◽  
Author(s):  
S.O Handeland ◽  
Å Berge ◽  
B.Th Björnsson ◽  
Ø Lie ◽  
S.O Stefansson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Seawater Adaptation ◽  
Atlantic Salmon Salmo Salar ◽  
Different Temperatures

Experimental demonstration of differences in sheltering behaviour between Icelandic populations of Atlantic salmon (Salmo salar) and Arctic char (Salvelinus alpinus)

2000 ◽  
Vol 57 (4) ◽  
pp. 719-724 ◽  
Author(s):  
Sveinn K Valdimarsson ◽  
Neil B Metcalfe ◽  
Skúli Skúlason
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Salvelinus Alpinus ◽  
Arctic Char ◽  
Population Differences ◽  
Experimental Demonstration ◽  
Local Adaptations ◽  
Atlantic Salmon Salmo Salar ◽  
Different Temperatures ◽  
Different Populations

Most salmonids, as well as many other freshwater fish species in the Northern Hemisphere, have been reported to show some form of daytime sheltering behaviour over the winter. Previous work has shown that temperatures around 6-8°C trigger the onset of this sheltering behaviour. However, fish from colder environments would be expected to respond differently to temperature than fish from warmer environments. The incidence of sheltering at different temperatures between two Icelandic populations of both juvenile Atlantic salmon (Salmo salar) and juvenile Arctic char (Salvelinus alpinus) was examined by quantifying the use of refuges in identical controlled laboratory conditions. The results showed clear differences in the sheltering response between the different populations. Salmon from a warm, productive stream and riverine char emerged more by day from their shelter at low temperatures (5-8°C) than did either salmon from a cold, unproductive stream or char from a landlocked lake population. These population differences indicate local adaptations that must be kept in mind when managing fish populations; moreover, the differences do not appear to be predictable on the basis of ambient thermal regimes.

The use of ventilation frequency as an accurate indicator of metabolic rate in juvenile Atlantic salmon (Salmo salar)

2008 ◽  
Vol 65 (10) ◽  
pp. 2081-2087 ◽  
Author(s):  
K. J. Millidine ◽  
N. B. Metcalfe ◽  
J. D. Armstrong
Keyword(s):  
Atlantic Salmon ◽  
Metabolic Rate ◽  
Salmo Salar ◽  
Ventilation Rate ◽  
Free Living ◽  
Atlantic Salmon Salmo Salar ◽  
Different Temperatures ◽  
Natural Settings ◽  
The Relationship ◽  
Accurate Indicator

Bioenergetics studies of free-living animals have long been hampered by limitations on our abilities to measure the energy costs of different activities. Here we evaluate whether it is possible to use the opercular ventilatory beat rate of a fish to estimate its rate of energy expenditure. Changes in metabolic rate (MR) and ventilation rate (VR) were recorded in yearling Atlantic salmon ( Salmo salar , weight range 1.8–12.64 g) engaged in different activities at different temperatures while within a respirometer. MR was found to correlate strongly with VR in all fish. The relationship was linear, and both the slope and corresponding intercept of the regression equation were strongly dependent on the fish’s body weight and the test temperature. From these relationships, a general equation was generated to predict MR at a range of temperatures from knowledge of a fish’s weight and its VR; this proved to be highly accurate (correlation between predicted and observed MRs: r = 0.95), although calibration of individual fish is recommended in studies that compare performance of individuals. Visual measurements of VR may therefore provide a highly accurate, cheap, and noninvasive method of measuring the energy consumption of fish engaged in natural behaviours in more natural settings.

Microstructure and texture of fresh and smoked Atlantic salmon, Salmo salar L., fillets from fish reared and slaughtered under different conditions

2001 ◽  
Vol 32 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Sjofn Sigurgisladottir ◽  
Margret S. Sigurdardottir ◽  
Helga Ingvarsdottir ◽  
Ole J. Torrissen ◽  
Hannes Hafsteinsson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar
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