Development of seawater tolerance and subsequent downstream migration in wild and stocked young-of-the-year derived Atlantic salmon Salmo salar smolts

2014 ◽  
Vol 84 (1) ◽  
pp. 178-192 ◽  
Author(s):  
H. A. Urke ◽  
J. V. Arnekleiv ◽  
T. O. Nilsen ◽  
K. J. Nilssen
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Downstream Migration ◽  
Atlantic Salmon Salmo Salar ◽  
Seawater Tolerance ◽  
Young Of The Year

Mechanisms underlying the increase in young-of-the-year Atlantic salmon (Salmo salar) density with habitat complexity

2008 ◽  
Vol 65 (9) ◽  
pp. 1956-1964 ◽  
Author(s):  
Oscar Venter ◽  
James W.A. Grant ◽  
Michelle V. Noël ◽  
Jae-woo Kim
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Habitat Complexity ◽  
Indirect Evidence ◽  
Growth Potential ◽  
Territory Size ◽  
Complex Environments ◽  
Atlantic Salmon Salmo Salar ◽  
Direct Support ◽  
Young Of The Year

We tested three hypotheses used to explain the increase in young-of-the-year (YOY) Atlantic salmon ( Salmo salar ) density with habitat complexity: the territory-size, predator-refuge, and foraging-benefits hypotheses. We manipulated habitat complexity in three different treatments (boulder-removed, control, and boulder-added) at eight sites in Catamaran Brook and the Little Southwest Miramichi River, New Brunswick. The density of juvenile salmon was two times higher in the boulder-added treatment than in the other treatments. Our data were consistent with the territory-size hypothesis; visual isolation was highest and territory size was smallest in the boulder-added treatment, and salmon selected microhabitats to maximize their field of view. Our results showed partial support for the predator-refuge hypothesis; salmon in the boulder-added sites were closer to cover and showed a reduced reaction distance to a novel stimulus, but did not preferentially select microhabitats closer to cover. We found no direct support for the foraging-benefits hypothesis; however, there is indirect evidence that boulders may improve the growth potential of instream habitat. Our results suggest that YOY Atlantic salmon may be attracted to complex environments for the increased cover and that the decreased visibility of these sites causes a reduction in territory size, allowing a higher density of fish.

17-β Estradiol and 4-nonylphenol delay smolt development and downstream migration in Atlantic salmon, Salmo salar

2004 ◽  
Vol 68 (2) ◽  
pp. 109-120 ◽  
Author(s):  
Steffen S Madsen ◽  
Søren Skovbølling ◽  
Christian Nielsen ◽  
Bodil Korsgaard
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Downstream Migration ◽  
Atlantic Salmon Salmo Salar

Effect of low temperature on seawater tolerance in Atlantic Salmon (Salmo salar) Smolts

Aquaculture ◽  
1990 ◽  
Vol 84 (2) ◽  
pp. 167-172 ◽  
Author(s):  
Trygve Sigholt ◽  
Bengt Finstad
Keyword(s):  
Low Temperature ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
Seawater Tolerance

scholarly journals Multiple central-place territories in wild young-of-the-year Atlantic salmon Salmo salar†

2008 ◽  
Vol 77 (3) ◽  
pp. 448-457 ◽  
Author(s):  
Stefán Ó. Steingrímsson ◽  
James W. A. Grant
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Central Place ◽  
Atlantic Salmon Salmo Salar ◽  
Young Of The Year

Patterns and correlates of movement and site fidelity in individually tagged young-of-the-year Atlantic salmon (Salmo salar)

2003 ◽  
Vol 60 (2) ◽  
pp. 193-202 ◽  
Author(s):  
Stefán Ó Steingrímsson ◽  
James W.A Grant
Keyword(s):  
Atlantic Salmon ◽  
Habitat Use ◽  
Salmo Salar ◽  
Site Fidelity ◽  
Population Regulation ◽  
Fish Movement ◽  
Population Densities ◽  
Atlantic Salmon Salmo Salar ◽  
Young Of The Year ◽  
Study Sites

The literature on stream fish movement offers diverse views on the patterns (restricted vs. nonrestricted), causes (competition vs. habitat use), and consequences (mobile fish of lower vs. equal fitness) of movement. We tagged 320 young-of-the-year Atlantic salmon (Salmo salar) (30.1–55.3 mm), using relatively noninvasive tagging (elastomers) and recovery (snorkeling) techniques, to test these alternative views. Most fish (mean = 63.8%) stayed in the study sites (10–120 m) throughout their respective study season (28–74 days). Of the resighted fish, 61.8% moved less than 1 m up- or down-stream and only three fish moved more than 10 m, causing extremely leptokurtic movement curves. Movement and site fidelity were weakly affected by habitat use and competition. Fish originally found in slow water moved farther than fish from fast water, whereas fish found at high population densities were more likely to disappear than fish from low densities. Finally, mobile fish grew as fast or faster than more sedentary fish, supporting the idea that movement can be advantageous and is not just a by-product of density-dependent population regulation.

Sign in / Sign up

Export Citation Format

Share Document