scholarly journals Modelling of environmental flow options for optimal Atlantic salmon,Salmo salar,embryo survival during hydropeaking

2014 ◽  
Vol 21 (6) ◽  
pp. 480-490 ◽  
Author(s):  
R. Casas-Mulet ◽  
K. Alfredsen ◽  
Å. Killingtveit
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Environmental Flow ◽  
Embryo Survival ◽  
Atlantic Salmon Salmo Salar

Effects of silt and very fine sand dynamics in Atlantic salmon (Salmo salar) redds on embryo hatching success

2006 ◽  
Vol 63 (7) ◽  
pp. 1450-1459 ◽  
Author(s):  
Mylène Levasseur ◽  
Normand E Bergeron ◽  
Michel F Lapointe ◽  
Francis Bérubé
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Fine Sand ◽  
Fine Sediment ◽  
Low Flow ◽  
Winter Period ◽  
Large Set ◽  
Embryo Survival ◽  
Atlantic Salmon Salmo Salar ◽  
Local Intensity

We conducted a 2-year field experiment examining the survival to hatching of Atlantic salmon (Salmo salar) in relation to the seasonal and spatial variations of silt and very fine sand (SVFS; <0.125 mm) content within a large set of artificial redds at two spawning sites of the Sainte-Marguerite River, Quebec, Canada. Each artificial redd consisted of an infiltration cube (30 cm × 30 cm × 20 cm) buried in a morpho-sedimentological unit resembling a salmon redd. One hundred fertilized Atlantic salmon eggs were inserted in a number of infiltration cubes during redd construction. The results indicate no significant relation between survival to hatching in spring and values of the sand index or total percent fine sediment <2 mm in redds at that time. However, the proportion of SVFS in the redds explained 83% of the variation in embryo survival, with a threshold at approximately 0.2% SVFS, above which survival dropped sharply below 50%. Infiltration of these very fine fractions mostly occurred under ice cover, during the low-flow winter period. However, during the spring flood period, infiltration-flushing patterns varied spatially and reflected spatial differences in local intensity of bed-load transport and fine sediment availability.

Discharge and hydraulic interactions in contrasting channel morphologies and their influence on site utilization by spawning Atlantic salmon (Salmo salar)

2006 ◽  
Vol 63 (11) ◽  
pp. 2567-2585 ◽  
Author(s):  
Hamish J Moir ◽  
Chris N Gibbins ◽  
Chris Soulsby ◽  
John H Webb
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Environmental Flow ◽  
Flow Stability ◽  
Rate Of Change ◽  
Rates Of Change ◽  
Atlantic Salmon Salmo Salar ◽  
Sediment Flow ◽  
Study Sites ◽  
Hydraulic Heterogeneity

Six study sites were selected to represent the range of channel morphologies, extending from dynamic pool–riffle to transitional step–pool/plane bed reach types, used by spawning Atlantic salmon (Salmo salar) in a small upland Scottish stream. The hydraulic functioning of reaches over the range of discharges used by spawning fish was characterized, and the influence of hydraulic heterogeneity and rates of change in discharge on the frequency of spawning was assessed. Relationships between discharge and depths and velocities differed significantly between sites; thus, hydraulic responses to changes in discharge were different. The range of discharges used for spawning differed between sites, although optimum discharges were similar. Integration of hydraulic information with microhabitat suitability predicted that spawning conditions should occur at discharges higher than those utilized by fish. There was no evidence that hydraulically heterogeneous sites were used more frequently than homogeneous ones. Rather, data suggest that the frequency of utilization of sites was governed principally by the availability of suitable sediment. Flow stability was important for spawning, with periods of rapidly varying discharge avoided. It is suggested that the rate of change in discharge should be considered more explicitly when assessing environmental flow needs.

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

Persistence of Orally Administered Salmonella enterica Serovars Agona and Montevideo in Atlantic Salmon (Salmo salar L.)

2005 ◽  
Vol 68 (7) ◽  
pp. 1336-1339 ◽  
Author(s):  
L. L. NESSE ◽  
T. LØVOLD ◽  
B. BERGSJØ ◽  
K. NORDBY ◽  
C. WALLACE ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Salmonella Enterica ◽  
Most Probable Number ◽  
Fish Feed ◽  
Internal Organs ◽  
Probable Number ◽  
Atlantic Salmon Salmo Salar ◽  
Gastric Intubation

The objective of our experiments was to study the persistence and dissemination of orally administered Salmonella in smoltified Atlantic salmon. In experiment 1, salmon kept at 15°C were fed for 1 week with feed contaminated with 96 most-probable-number units of Salmonella Agona per 100 g of feed and then starved for 2 weeks. Samples were taken from the gastrointestinal tract and examined for Salmonella 1, 2, 8, 9, 15, and 16 days after the feeding ended. In experiment 2, Salmonella Agona and Montevideo were separately mixed with feed and administered by gastric intubation. Each fish received 1.0 × 108, 1.0 × 106, or 1.0 × 104 CFU. The different groups were kept in parallel at 5 and 15°C and observed for 4 weeks. Every week, three fish in each group were sacrificed, and samples were taken from the skin, the pooled internal organs, the muscle, and the gastrointestinal tract and examined for the presence of Salmonella. The results from the two experiments showed that the persistence of Salmonella in the fish was highly dependent on the dose administered. Salmonella was not recovered from any of the fish that were fed for 1 week with the lowest concentration of Salmonella. In the fish given the highest dose of Salmonella, bacteria persisted for at least 4 weeks in the gastrointestinal tract as well as, to some extent, the internal organs. The present study shows that under practical conditions in Norway, the risk of Salmonella in fish feed being passed on to the consumer of the fish is negligible.

Quantifying the relative importance of stock level, river temperature and discharge on the abundance of juvenile Atlantic salmon ( Salmo salar )

Ecohydrology ◽  
2020 ◽  
Vol 13 (6) ◽  
Author(s):  
Ross S. Glover ◽  
Chris Soulsby ◽  
Robert J. Fryer ◽  
Christian Birkel ◽  
Iain A. Malcolm
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Relative Importance ◽  
Stock Level ◽  
River Temperature ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon

Effects of orally administered immunostimulants on inflammatory gene expression and sea lice (Lepeophtheirus salmonis) burdens on Atlantic salmon (Salmo salar)

Aquaculture ◽  
2012 ◽  
Vol 366-367 ◽  
pp. 9-16 ◽  
Author(s):  
J.M. Covello ◽  
S.E. Friend ◽  
S.L. Purcell ◽  
J.F. Burka ◽  
R.J.F. Markham ◽  
...  
Keyword(s):  
Gene Expression ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Sea Lice ◽  
Lepeophtheirus Salmonis ◽  
Inflammatory Gene Expression ◽  
Inflammatory Gene ◽  
Atlantic Salmon Salmo Salar
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