Kidney Disease in Juvenile Atlantic Salmon (Salmo salar) in the Margaree River

1969 ◽  
Vol 26 (9) ◽  
pp. 2535-2537 ◽  
Author(s):  
J. H. C. Pippy
Keyword(s):  
Kidney Disease ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
River System ◽  
Juvenile Salmon ◽  
Wild Salmon ◽  
Atlantic Salmon Salmo Salar ◽  
Bacterial Kidney Disease ◽  
Juvenile Atlantic Salmon

Bacterial kidney disease was presumptively identified in each of 25 hatchery-reared juvenile salmon (Salmo salar) but in only 2 of 235 wild juveniles in the Margaree River system. Apparently spread of disease from the hatchery to wild salmon in the river is very gradual.

Nocturnal activity of juvenile Atlantic salmon (Salmo salar) in late summer: evidence of diel activity partitioning

1997 ◽  
Vol 54 (6) ◽  
pp. 1408-1413 ◽  
Author(s):  
Gabe Gries ◽  
Kevin G Whalen ◽  
Francis Juanes ◽  
Donna L Parrish
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Late Summer ◽  
Diel Activity ◽  
Juvenile Salmon ◽  
Time Budgets ◽  
Nocturnal Activity ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon ◽  
Young Of The Year

Paired day-night underwater counts of juvenile Atlantic salmon (Salmo salar) were completed on tributaries of the West River, Vermont, U.S.A., between 28 August and 10 September 1995. At water temperatures ranging from 13 to 23°C, the relative count of juvenile salmon was greater at night. Nocturnal counts differed for young-of-the-year and post-young-of-the-year (PYOY) salmon, with PYOY exhibiting almost exclusive nocturnal activity. Nocturnal activity in late summer may enable salmon to maintain population densities when space and suitable feeding areas may be limited. Nocturnal activity of juvenile salmon should be considered in studies of habitat use, competition, time budgets, and associated bioenergetic processes.

Microhabitat use by juvenile Atlantic salmon (Salmo salar ) sheltering during the day in summer

1998 ◽  
Vol 76 (8) ◽  
pp. 1441-1449 ◽  
Author(s):  
Gabe Gries ◽  
Francis Juanes
Keyword(s):  
Atlantic Salmon ◽  
Water Column ◽  
Salmo Salar ◽  
Maximum Temperature ◽  
Juvenile Salmon ◽  
Microhabitat Use ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon ◽  
Young Of The Year ◽  
And Behavior

Daytime snorkeling surveys were conducted in the Wardsboro Branch, a tributary of the West River, Vermont, U.S.A., in July and August 1996. We documented microhabitat use by 245 juvenile Atlantic salmon (Salmo salar) sheltering (i.e., concealed beneath the stream substrate) at water temperatures ranging from 17 to 23°C, well above 10°C, the maximum temperature at which young salmon are thought to shelter during the day. The majority (92%) of sheltering salmon were young-of-the-year salmon (YOY). Of the YOY observed, 45% were sheltering, while 55% were in the water column. In comparison, only 10% of post-young-of-the-year salmon (PYOY; age 1 or older) observed were sheltering, while 90% were in the water column. Sheltering PYOY occupied greater water depths and were found under larger substrate stones than were YOY. Sheltering salmon (YOY and PYOY) were not distributed in proportion to the available microhabitat. Salmon only sheltered beneath unembedded cobble or boulder substrate, and sheltering salmon were found in pool habitats 43% of the time. Daytime sheltering suggests that the current interpretation of juvenile salmon habitat use and behavior during summer is incomplete. The availability of suitable sheltering habitats may be a factor affecting juvenile salmon production.

Variations in the plasma proteins of Atlantic salmon (Salmo salar L.)

1969 ◽  
Vol 47 (5) ◽  
pp. 759-761 ◽  
Author(s):  
J. A. McKenzie ◽  
U. Paim
Keyword(s):  
Atlantic Salmon ◽  
New Brunswick ◽  
Salmo Salar ◽  
Gel Electrophoresis ◽  
Plasma Proteins ◽  
River System ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon ◽  
Potential Use

The plasma proteins of 51 juvenile Atlantic salmon were examined by vertical acrylamide gel electrophoresis. Eight distinct phenotypes were found from specimens originating from a single river system in New Brunswick. The potential use of these polymorphisms for identifying populations is discussed.

Impact of exposure to a simulated predator (Mergus merganser) on the activity of juvenile Atlantic salmon (Salmo salar) in a natural environment

2002 ◽  
Vol 80 (11) ◽  
pp. 2006-2013 ◽  
Author(s):  
Mélanie Dionne ◽  
Julian J Dodson
Keyword(s):  
Grain Size ◽  
Body Size ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Natural Environment ◽  
Juvenile Salmon ◽  
Short Term ◽  
Sediment Grain Size ◽  
Atlantic Salmon Salmo Salar ◽  
Juvenile Atlantic Salmon

Some laboratory studies suggest that the presence of predators influences the short-term behaviour of juvenile Atlantic salmon. However, few studies have been conducted in the natural environment to confirm these observations and to document how biological and environmental factors influence the behaviour of fish faced with a predator. Of the many potential predators of juvenile Atlantic salmon, Salmo salar, the common merganser, Mergus merganser, is a major one. This study was designed to investigate the immediate and short-term impact of exposure to a simulated avian predator on the activity of juvenile Atlantic salmon in their natural habitat. The influence of riverbed sediment grain size, a major determinant of habitat choice in salmon, and body size of juvenile salmon on the nature and intensity of their response to the predator was also investigated. Observations were made before and after exposure to a model of M. merganser in three situations: (1) fry (young salmon during their first summer of life) on fine sediment, (2) fry on coarse sediment, and (3) parr (young salmon during their second or third summer of life) on coarse sediment. Observations were also made on fry exposed to a harmless floating stimulus to evaluate if the decoys were perceived as threat. Following exposure, the feeding rate of juvenile salmon decreased by 25–39% and the moving rate increased by 123–386%. Sediment grain size influenced the nature of the immediate response of juvenile salmon, while body size influenced the intensity of the moving response. Parr moved significantly more than fry after exposure to the simulated predator.

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