Low concentrations of sodium hypochlorite affect population dynamics in Gyrodactylus salaris (Malmberg, 1957): practical guidelines for the treatment of the Atlantic salmon, Salmo salar L. parasite

2014 ◽  
Vol 37 (12) ◽  
pp. 1003-1011 ◽  
Author(s):  
A G Hagen ◽  
S Hytterød ◽  
K Olstad
Keyword(s):  
Population Dynamics ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Sodium Hypochlorite ◽  
Atlantic Salmon Salmo Salar ◽  
Low Concentrations ◽  
Practical Guidelines

Electrical Responses of the Olfactory Epithelium of Atlantic Salmon (Salmo salar)

1971 ◽  
Vol 28 (4) ◽  
pp. 565-572 ◽  
Author(s):  
A. M. Sutterlin ◽  
N. Sutterlin
Keyword(s):  
Amino Acids ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Olfactory Epithelium ◽  
Spike Activity ◽  
Olfactory Mucosa ◽  
Oscillatory Activity ◽  
Atlantic Salmon Salmo Salar ◽  
Low Concentrations ◽  
Complex Solutions

Multiunit spike activity was recorded from the olfactory mucosa of Atlantic salmon (Salmo salar) using metal-filled glass microelectrodes. A number of simple and complex solutions were tested for stimulatory effectiveness. Amino acids as a class of compounds were highly stimulatory; little or no response was obtained to a variety of simple sugars, n-aliphatic acids, alcohols, or amino-substituted alcohols. An increase in asynchronous spike activity was evoked by low concentrations of amino acids and oscillatory activity was evoked by higher concentrations of amino acids. Brief treatment of the epithelium with dilute solutions of HgCl2 blocked the chemosensitivity of the receptors.

A temporal perspective on population structure and gene flow in Atlantic salmon (Salmo salar) in Newfoundland, Canada

2010 ◽  
Vol 67 (2) ◽  
pp. 225-242 ◽  
Author(s):  
Friso P. Palstra ◽  
Daniel E. Ruzzante
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
Gene Flow ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Environmental Changes ◽  
Population Connectivity ◽  
Temporal Perspective ◽  
Atlantic Salmon Salmo Salar ◽  
Contemporary Gene Flow

Studying population structure and gene flow patterns on temporal scales facilitates an evaluation of the consequences of demographic, physical, and environmental changes on the stability and persistence of populations. Here, we examine temporal genetic variation within and among Atlantic salmon ( Salmo salar ) rivers in Newfoundland and Labrador, Canada, using samples collected over a period of six decades (1951–2004). Our objective was to evaluate temporal changes in population connectivity associated with the closure of a commercial marine fishery. Despite demographic instability, we find that population structure remained temporally stable over more than 50 years. However, age structure can affect results when not taken into consideration, particularly in populations of large effective size where genetic drift is not strong. Where weak signals of genetic differentiation did not complicate analyses, contemporary migration was often asymmetric, yet low, suggesting patterns of intermittent gene flow. Nevertheless, we find some links between changes in population dynamics and contemporary gene flow. These findings may therefore imply that management decisions impacting the contemporary population dynamics of individual Atlantic salmon rivers can also affect the genetic stability of this species as a whole.

scholarly journals Provision of catch advice taking account of non-stationarity in productivity of Atlantic salmon (Salmo salar L.) in the Northwest Atlantic

2005 ◽  
Vol 62 (1) ◽  
pp. 131-143 ◽  
Author(s):  
G. Chaput ◽  
C.M. Legault ◽  
D.G. Reddin ◽  
F. Caron ◽  
P.G. Amiro
Keyword(s):  
Population Dynamics ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Model Prediction ◽  
Northwest Atlantic ◽  
Atlantic Salmon Salmo Salar ◽  
Parsimonious Models ◽  
Rate Of Decline ◽  
Management Advice ◽  
Mixed Stock

Abstract The paper presents the data, the models, and the approach for the provision of management advice for a high seas mixed stock fishery on Atlantic salmon (Salmo salar L.). The approach incorporates observation errors, model uncertainty, and considers a possible shift in the productivity of Atlantic salmon. The risk analysis framework further incorporates uncertainty in the fishery harvest characteristics and presents the catch advice as probabilities of meeting or exceeding the conservation objectives relative to catch options. There is very strong evidence from the analyses that there has been a phase shift in productivity of Atlantic salmon of North American origin in the Northwest Atlantic. The change in productivity likely resulted from a change in marine survival which occurred in the early 1990s and has persisted to date. When the uncertainties in the input data are considered, the most parsimonious models suggest that there has been a shift in absolute abundance independent of variations in the spawner index contributing to the recruitment. There continues to be a large amount of uncertainty in the measures of abundance and population dynamics of Atlantic salmon. Uncertainty in the understanding of population dynamics does not necessarily equate to uncertainty in management advice. If model results suggest that spawning objectives are unattainable even when harvest rates are zero, then any harvest level will either accelerate the rate of decline if the model prediction is correct or diminish the probability of recovery if the model prediction is wrong.

Population Dynamics of Vibrio and Pseudomonas Species Isolated from Farmed Tasmanian Atlantic Salmon (Salmo salar L.): A Seasonal Study

2014 ◽  
Vol 68 (4) ◽  
pp. 679-687 ◽  
Author(s):  
Eva Hatje ◽  
Christina Neuman ◽  
Hollie Stevenson ◽  
John P. Bowman ◽  
Mohammad Katouli
Keyword(s):  
Population Dynamics ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
Seasonal Study ◽  
Pseudomonas Species

Temperature Selection of Atlantic Salmon (Salmo salar) and Brook Trout (Salvelinus fontinalis) as Influenced by Various Chlorinated Hydrocarbons

1973 ◽  
Vol 30 (8) ◽  
pp. 1091-1097 ◽  
Author(s):  
R. H. Peterson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Brook Trout ◽  
Polychlorinated Biphenyl ◽  
Salvelinus Fontinalis ◽  
Vertical Gradient ◽  
Temperature Selection ◽  
Atlantic Salmon Salmo Salar ◽  
Low Concentrations ◽  
Exposure Levels

The effects of previous exposure to p,p′-DDT, o,p′-DDT, p,p′-DDD, p,p′-DDE, and methoxychlor on temperature selection by juvenile Atlantic salmon (Salmo salar) in a horizontal temperature gradient were similar. Exposure to low concentrations resulted in no change or a decrease in selected temperatures as compared to control values of about 16 C. Exposure to higher concentrations raised selected temperatures. The concentrations of the substances required to produce a given effect varied as: p,p′-DDT≥p,p′-DDD> methoxychlor >o,p′-DDT>p,p′-DDE. Exposure levels of p,p′-DDA≤ 8 ppm did not alter temperature selection nor did exposure to Aroclor® 1254, a polychlorinated biphenyl (PCB) preparation at 2 ppm. Aldrin lowered temperature selection at 0.1–0.15 ppm. In a vertical gradient, brook trout (Salvelinus fontinalis) previously exposed to p,p′-DDT and p,p′-DDD selected higher temperatures than controls.

Tetrachloro-o-benzoquinone as a Component in Bleached Kraft Chlorination Effluent Toxic to Young Salmon

1969 ◽  
Vol 26 (11) ◽  
pp. 3055-3067 ◽  
Author(s):  
B. S. Das ◽  
S. G. Reid ◽  
J. L. Betts ◽  
K. Patrick
Keyword(s):  
Sulfur Dioxide ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Sodium Borohydride ◽  
Water Solution ◽  
Substantial Loss ◽  
Experimental Support ◽  
Toxic Component ◽  
Atlantic Salmon Salmo Salar ◽  
Low Concentrations

Evidence is given that tetrachloro-o-benzoquinone is involved in the toxicity of bleached kraft chlorination effluent (BKCE) to young Atlantic salmon, Salmo salar. The main experimental support was isolation of tetrachlorocatechol from whole BKCE and from a BKCE fraction toxic to salmon, after reduction of both with sodium borohydride. Tetrachloro-o-benzoquinone was shown to be toxic to salmon at low concentrations. Instability of the toxic component in BKCE and substantial loss of toxicity upon treatment of BKCE with sulfur dioxide agreed with the properties of tetrachloro-o-benzoquinone in water solution.

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