Hindrances to upstream migration of atlantic salmon (Salmo salar) in a northern Swedish river caused by a hydroelectric power-station

2001 ◽  
Vol 17 (2) ◽  
pp. 101-115 ◽  
Author(s):  
Peter Rivinoja ◽  
Skip McKinnell ◽  
Hans Lundqvist
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Hydroelectric Power Station ◽  
Upstream Migration ◽  
Hydroelectric Power ◽  
Power Station ◽  
Atlantic Salmon Salmo Salar

scholarly journals Freshwater population of the Atlantic salmon (Salmo salar Linnaeus, 1758) of the Svir River (the Ladoga Lake basin): abundance, structure and conservation

2019 ◽  
Vol 323 (4) ◽  
pp. 451-457
Author(s):  
I.G. Murza ◽  
O.L. Christoforov
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Hydroelectric Power Station ◽  
Lake Basin ◽  
Hydroelectric Power ◽  
Atlantic Salmon Salmo Salar ◽  
Ladoga Lake ◽  
Salmon Population ◽  
Long Time ◽  
Freshwater Population

Until the early 1930s the Svir River freshwater population of Atlantic salmon (Salmo salar Linnaeus, 1758) was the largest in the Ladoga Lake basin. A catastrophic decrease in the salmon abundance took place due to loss of spawning grounds after the dam construction in the riverbed and a long-time timber rafting in the main tributaries. Over-fishery in the 1950s and a poaching also contributed to this negative trend. The Svirsky hatchery was put in action in 1933 to support the salmon population. In course of 30-year monitoring the size characteristics of smolts, lake-living individuals and spawners were determined, as well as the state of gonads in males and females at different stages of the life cycle were evaluated. The “autumnal” form was described. It was found that all salmon spawners caught near the dam of the hydroelectric power station over the last decades were of hatchery origin and belonged to the same age classes as in the previous period. The present-day scale of hatchery propagation is too small for conservation of the Svir River salmon population. The population will be lost soon, if an artificial reproduction will not expanded and effective actions of fishery control inspection will not restored.

Atlantic Salmon Salmo salar upstream migration delay in a large hydropower reservoir

2020 ◽  
Author(s):  
Amanda B. Babin ◽  
Stephan Peake ◽  
Tommi Linnansaari ◽  
R. Allen Curry ◽  
Mouhamed Ndong ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Upstream Migration ◽  
Atlantic Salmon Salmo Salar ◽  
Hydropower Reservoir

Atlantic Salmon (Salmo salar) of the Leaf River, Ungava Bay

1976 ◽  
Vol 33 (11) ◽  
pp. 2616-2621 ◽  
Author(s):  
R. L.G. Lee ◽  
G. Power
Keyword(s):  
Atlantic Salmon ◽  
Fresh Water ◽  
Salmo Salar ◽  
Sex Ratios ◽  
Fork Length ◽  
Upstream Migration ◽  
Atlantic Salmon Salmo Salar ◽  
Length Range ◽  
Heavy Mortality

The Leaf River supports the most northerly known population of anadromous Atlantic salmon (Salmo salar) in Canada. River growth averaged 40–50 mm/yr, smolts averaged 258 mm fork length (range 190–300 mm) and 5.3 yr (range 4+ to 7+). Many males matured in fresh water and either incurred heavy mortality or became residual. Sex ratios among smolts were 5:1 in favor of females and among adults 3:1 in favor of females. Female 2-sea-winter salmon accounted for 75% of the fresh-run fish. Upstream migration peaked in August: kelts were still resident in the river 11 and 12 mo later.

Transferrin Variation in North American Populations of the Atlantic Salmon, Salmo salar

1974 ◽  
Vol 31 (6) ◽  
pp. 1037-1041 ◽  
Author(s):  
R. H. Payne
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
North American ◽  
Genetic Divergence ◽  
River System ◽  
Upstream Migration ◽  
Atlantic Salmon Salmo Salar ◽  
Life Styles ◽  
Genetic Discontinuity ◽  
Significant Deficit

A latitudinal cline was indicated by the frequency of the Tf4 transferrin allele in North American populations of the Atlantic salmon (Salmo salar) and an earlier suggestion of a major genetic discontinuity between the salmon populations of Newfoundland and those of the Canadian Maritimes is rejected.Male one-sea-winter fish had a statistically significant deficit of heterozygotes but transferrin phenotypes of one-sea-winter females and two-sea-winter or older fish of either sex agreed closely with the predictions of Hardy–Weinberg–Castle equilibria. Heterozygosity for Tf4 may be semilethal in male salmon programmed to return to spawn after one winter at sea.A comparison of anadromous and nonanadromous salmon populations from the same river system demonstrated that considerable genetic divergence can take place when postglacial crustal recovery produces barriers to upstream migration. The relative fitnesses of the transferrin phenotypes may be different for anadromous and nonanadromous life styles. In view of the demonstrated genetic divergence between anadromous and nonanadromous salmon stocks, the practice of "improving" salmon rivers by removing natural obstructions to upstream migration must be reconsidered in the case of river systems which have large stocks of nonanadromous salmon.

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