Effect of a Reciprocal Photoperiod Regime on Standard Rate of Oxygen Consumption of Postsmolt Atlantic Salmon (Salmo salar)

1973 ◽  
Vol 30 (12) ◽  
pp. 1898-1900 ◽  
Author(s):  
Kathryn G. Withey ◽  
Richard L. Saunders
Keyword(s):  
Oxygen Consumption ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Sea Water ◽  
Late Summer ◽  
Atlantic Salmon Salmo Salar ◽  
Photoperiod Regime ◽  
Natural Photoperiod ◽  
Rate Of Oxygen Consumption ◽  
Standard Rate

Postsmolt Atlantic salmon (Salmo salar) subjected to a reciprocal photoperiod regime (decreasing daylength from early March and increasing daylength from late June) had significantly lower standard rates of oxygen consumption than those subjected to a simulated natural photoperiod regime when both were tested in total darkness in sea water in late summer. A reduced metabolic level, as indicated by the low standard rate of oxygen consumption, in the test fish is consistent with earlier observations of reduced feeding and growth rates and food conversion efficiencies in similarly treated fish following transfer to sea water.

Changes in Gill ATPase Activity and Smolt Status of Atlantic Salmon (Salmo salar)

1978 ◽  
Vol 35 (12) ◽  
pp. 1542-1546 ◽  
Author(s):  
Richard L. Saunders ◽  
Eugene B. Henderson
Keyword(s):  
Moisture Content ◽  
Atlantic Salmon ◽  
Atpase Activity ◽  
Salmo Salar ◽  
Salinity Tolerance ◽  
Atlantic Salmon Salmo Salar ◽  
Photoperiod Regime ◽  
Natural Photoperiod ◽  
Salmon Smolt ◽  
Photoperiod Manipulation

Gill Na+K+-activated ATPase activity increased during winter–spring in Atlantic salmon (Salmo salar) held at 10 °C and subjected to simulated natural or reciprocal (light/dark ratio opposite that of natural) photoperiods. ATPase activity increased earlier and was greater under the reciprocal than under the natural photoperiod regime. Body lipid decreased and moisture content increased sooner and more sharply in reciprocal than in natural photoperiod fish. Salinity tolerance (to 40‰) increased between March and April. Exposure to 40‰ salinity for periods up to 14 d gave marked increases in ATPase activity over levels measured in freshwater. Gill ATPase activity is a sensitive indicator of the ability of Atlantic salmon to osmoregulate in seawater. Together with lipid-moisture content, tolerance to high salinity, and migratory behavior, gill ATPase activity provides a valid indication of smolt readiness to migrate to sea. Key words: smolt criteria, photoperiod manipulation, Atlantic salmon, smolt physiology, salinity tolerance, osmoregulation

Nutritive value of partially dehulled and extruded sunflower meal for post-smolt Atlantic salmon (Salmo salar L.) in sea water

2006 ◽  
Vol 37 (13) ◽  
pp. 1348-1359 ◽  
Author(s):  
Navneet Gill ◽  
David A Higgs ◽  
Brent J Skura ◽  
Mahmoud Rowshandeli ◽  
Bakhshish S Dosanjh ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Nutritive Value ◽  
Sea Water ◽  
Sunflower Meal ◽  
Atlantic Salmon Salmo Salar

Otolith-derived estimates of marine temperature use by West Greenland Atlantic salmon (Salmo salar)

2015 ◽  
Vol 72 (7) ◽  
pp. 2139-2148 ◽  
Author(s):  
Vanessa Minke-Martin ◽  
J. Brian Dempson ◽  
Timothy F. Sheehan ◽  
Michael Power
Keyword(s):  
Individual Differences ◽  
Atlantic Salmon ◽  
Data Storage ◽  
Salmo Salar ◽  
Late Summer ◽  
Growth Zone ◽  
Micro Milling ◽  
West Greenland ◽  
Atlantic Salmon Salmo Salar ◽  
Preferred Temperatures

Abstract Otolith-derived estimates of mean marine temperatures used by West Greenland 1SW Atlantic salmon (Salmo salar) of North American origin were determined for fish collected in 2009 and 2010. Otolith material corresponding to the second summer at sea was subsampled, via micro-milling, and analysed by mass spectrometry to produce stable oxygen isotope (δ18O) values from which temperature use estimates were obtained from a salmonid-based fractionation equation. Mean temperature estimates did not differ significantly by period (early vs. late summer), or capture year. The mean and variation estimates were also consistent with temperature use values previously published in the literature or derived from the limited number of data storage tags that have been retrieved for Atlantic salmon, with 80% of all individuals occupying temperatures in the 3.9–9.7°C range. Among-individual differences in temperature use did not correlate with measured otolith growth zone widths. Given the temporal, spatial and methodological variation associated with the derivation of marine temperature use estimates for Atlantic salmon, the data were interpreted to define a range of preferred temperatures within which among-individual differences in growth were driven by the interaction of feeding and temperature use, possibly as a result of the opportunistic feeding behaviour known to predominate among Atlantic salmon.

Hourly and total oxygen consumption by ova of Atlantic salmon, Salmo salar L., during embryogenesis, at two temperatures and three levels of dissolved oxygen

1979 ◽  
Vol 57 (6) ◽  
pp. 1196-1200 ◽  
Author(s):  
T. Hamor ◽  
E. T. Garside
Keyword(s):  
Oxygen Consumption ◽  
Atlantic Salmon ◽  
Oxygen Uptake ◽  
Dissolved Oxygen ◽  
Salmo Salar ◽  
Developmental Time ◽  
Total Oxygen ◽  
Weighted Mean ◽  
Atlantic Salmon Salmo Salar ◽  
Two Temperatures

Weighted mean hourly rates of oxygen consumption in embryonated ova of Atlantic salmon, Salmo salar L., during embryogenesis, were reduced significantly by levels of dissolved oxygen below air saturation and by a temperature of 5 °C, relative to those for ova incubated at 10 °C. Total oxygen consumption during embryogenesis also was reduced significantly by the lower levels of dissolved oxygen, but not by temperature. The decrease in the pace of embryogenesis in the lots of ova at 5 °C extended the developmental time so that the lower rate of oxygen uptake was offset. Thus, within each level of dissolved oxygen there was no appreciable difference in the products of time units and units of oxygen uptake. At 5 °C, 100% air saturation, mean hourly uptake was 0.0141 mg O2/ovum, and total uptake was 28.153 mg O2/ovum. At 10 °C, 100% air saturation, these values were 0.0270 mg O2/ovum, and 27.974 mg O2/ovum, respectively. Values for ova incubated at 50 and 30% air saturation were correspondingly lower.

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