Impact of Recent Economic Growth and Industrial Development on the Ecology of Northwest Miramichi Atlantic Salmon (Salmo salar)

1974 ◽  
Vol 31 (5) ◽  
pp. 521-544 ◽  
Author(s):  
Paul F. Elson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Industrial Development ◽  
Pollution Abatement ◽  
Commercial Fishing ◽  
Metal Mining ◽  
Atlantic Salmon Salmo Salar ◽  
Recent Developments ◽  
History Of ◽  
Chemical Conditions

The history of Atlantic salmon (Salmo salar) runs of the Northwest Miramichi from 1950 to 1973 is reviewed. Decreases in these runs are related to degrading of ecological conditions in the river's rearing reaches as a result of adverse chemical conditions attributable to recent developments in forest management and to base metal mining. Diversion of indigenous adult stocks into other streams of the system as a result of pollution of the home stream by mining, pulpmill, and other human activities is examined and evaluated. Increase of commercial catches as a result of pollution-caused delay in the estuary of migrating adults is analyzed. Grave depletion of stocks as a result of the combined effects of these factors plus distant-water fishing is identified, as is incipient recovery of stocks when home-water commercial fishing was eliminated and pollution abatement measures were introduced to the river. A suppressing effect of heavy angling pressure on stock abundance when stocks are low is noted.

scholarly journals The effects of ionic strength on the toxicity of aluminium to Atlantic salmon (Salmo salar) under non-steady state chemical conditions

2002 ◽  
Vol 61 (1) ◽  
pp. 69 ◽  
Author(s):  
Espen LYDERSEN ◽  
Sigurd ØXNEVAD ◽  
Kjartan ØSTBYE ◽  
Ronny A. ANDERSEN ◽  
Frode BJERKELY ◽  
...  
Keyword(s):  
Steady State ◽  
Ionic Strength ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
State Chemical ◽  
Chemical Conditions

Origin and life history of Atlantic salmon (Salmo salar) near their northernmost oceanic limit

2014 ◽  
Vol 71 (11) ◽  
pp. 1740-1746 ◽  
Author(s):  
Arne J. Jensen ◽  
Sten Karlsson ◽  
Peder Fiske ◽  
Lars Petter Hansen ◽  
Gunnel M. Østborg ◽  
...  
Keyword(s):  
Climate Change ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
The Arctic ◽  
Genetic Assignment ◽  
Atlantic Salmon Salmo Salar ◽  
The Arctic Ocean ◽  
History Of ◽  
Genetic Profiles ◽  
Rule Out

138 Atlantic salmon (Salmo salar) captured in the Advent Fjord off Svalbard were genetically assigned to two main clusters of European salmon. Two-thirds were assigned to salmon rivers in Finnmark (the northernmost county in Norway) and the rest to salmon rivers further south in Norway. The genetic assignment was based on genetic profiles from 60 Norwegian rivers. The two clusters correspond to two larger genetic groupings: the Barents–White seas and Atlantic groupings. Thus, we cannot rule out other populations from these groupings as sources of Atlantic salmon at Svalbard. Svalbard salmon assigned to the two genetic groupings differed in ecological and phenological traits, with highest smolt age and lowest postsmolt growth in the Finnmark salmon cluster. High smolt ages in both groups, however, suggest a northern origin of most individuals in the sample. Although Atlantic salmon have sporadically been observed in the Arctic Ocean at earlier times, the high abundance outlined here seems to be a recent phenomenon, suggesting a northward penetration caused by climate change.

Recent Changes in Stock Composition of Atlantic Salmon (Salmo salar) in the Miramichi River, New Brunswick

1973 ◽  
Vol 30 (6) ◽  
pp. 779-786 ◽  
Author(s):  
C. P. Ruggles ◽  
G. E. Turner
Keyword(s):  
Atlantic Salmon ◽  
New Brunswick ◽  
Salmo Salar ◽  
Reproductive Potential ◽  
Commercial Fishing ◽  
Fishing Mortality ◽  
Atlantic Salmon Salmo Salar ◽  
Spawning Stock

Data collected from 1954 to 1971 show that the recent decline in Miramichi River Atlantic salmon (Salmo salar) abundance has been accompanied by changes in the ratio of grilse to large salmon (2-sea-years and older) entering the river. From 1954 to 1962 trap samples were composed of about equal numbers of grilse and large salmon. Since 1963 the grilse catch has averaged 87%. Large declines in abundance of the fall-run grilse portion of the spawning stock occurred in 1968 and similar declines occurred in the fall-run large salmon component in 1969. An increase in commercial fishing mortality of large salmon is believed responsible for shifting the river escapement in favor of grilse. The result has been a reduction in reproductive potential and declines in the fall-run stocks of both large salmon and grilse.

Sign in / Sign up

Export Citation Format

Share Document