Liver Glycogen, Enzyme Activities, and Pancreatic Hormones in Juvenile Atlantic Salmon (Salmo salar) during Their First Summer in Seawater

1994 ◽  
Vol 51 (3) ◽  
pp. 567-576 ◽  
Author(s):  
Erika M. Plisetskaya ◽  
Thomas W. Moon ◽  
Donald A. Larsen ◽  
Glen D. Foster ◽  
Walton W. Dickhoff
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Coho Salmon ◽  
Glycogen Synthesis ◽  
Puget Sound ◽  
Liver Glycogen ◽  
Pancreatic Hormones ◽  
Glycogen Concentration ◽  
Atlantic Salmon Salmo Salar ◽  
Summer Mortality

Our observation of very low liver glycogen concentration in 1-yr-old feeding Atlantic salmon (Salmo salar) in seawater net-pens in Puget Sound, Washington, led to studies of their metabolic status. We assessed liver glycogen concentration, activities of some hepatic enzymes involved in glycogen synthesis, depletion, and gluconeogenesis, and plasma profiles of glucose and pancreatic hormones (insulin and glucagon) in yearling Atlantic salmon before and after seawater transfer. Liver glycogen concentration in Atlantic salmon during the several months after seawater entry was much lower than in coho salmon (Oncorhynchus kisutch) of the same age in seawater. Other metabolic and hormonal indices throughout the study did not differ substantially between the two species. During their first summer in seawater net-pens, seemingly healthy, feeding 1-yr-old Atlantic salmon smolts are prone to high mortality. We hypothesize that the virtual absence of glycogen reserves in the liver makes seawater-adapted 1-yr-old Atlantic salmon juveniles particularly susceptible to stress and may contribute to high summer mortality.

Neuroendocrine stress response in Atlantic salmon (Salmo salar) and Coho salmon (Oncorynchus kisutch) during sea lice infestation

Aquaculture ◽  
2019 ◽  
Vol 507 ◽  
pp. 329-340 ◽  
Author(s):  
L. Vargas-Chacoff ◽  
J.L.P. Muñoz ◽  
J. Saravia ◽  
R. Oyarzún ◽  
J.P. Pontigo ◽  
...  
Keyword(s):  
Stress Response ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Coho Salmon ◽  
Sea Lice ◽  
Atlantic Salmon Salmo Salar

Interspecific competition and juvenile Atlantic salmon (Salmo salar): on testing effects and evaluating the evidence across scales

1998 ◽  
Vol 55 (S1) ◽  
pp. 218-231 ◽  
Author(s):  
Kurt D Fausch
Keyword(s):  
Atlantic Salmon ◽  
Interspecific Competition ◽  
Salmo Salar ◽  
Coho Salmon ◽  
Relative Strength ◽  
Nonnative Species ◽  
Spatial And Temporal Scales ◽  
Competitive Effects ◽  
Atlantic Salmon Salmo Salar ◽  
Complex Interactions

A review of 17 controlled experiments of interspecific competition between juveniles of Atlantic salmon (Salmo salar) and other fishes revealed relatively little evidence to judge competitive effects at any scale. More than half were unreplicated and so inadequate to test either the existence or relative strength of interspecific competition. Most replicated experiments used one of two designs appropriate to address questions of interest, such as whether nonnative species affect Atlantic salmon via competition or whether interspecific competition from coevolved salmonids is greater than intraspecific competition. Replicated experiments spanned a broad range of spatial and temporal scales, and one well-designed field experiment yielded the strongest inference at useful scales. Nonnative salmonids being introduced worldwide into Atlantic salmon waters have the potential to invade, so experiments testing their effects are most urgently needed. Overall, juvenile coho salmon (Oncorhynchus kisutch) are suspected to have the greatest effect, partly due to their inherent size advantage. The potential for complex interactions or indirect effects to modify effects of nonnative species is completely unknown but may be important and needs investigation.

Ectoparasite Caligus rogercresseyi modifies the lactate response in Atlantic salmon ( Salmo salar ) and Coho salmon ( Oncorhynchus kisutch )

2017 ◽  
Vol 243 ◽  
pp. 6-11 ◽  
Author(s):  
L. Vargas-Chacoff ◽  
J.L.P. Muñoz ◽  
C. Hawes ◽  
R. Oyarzún ◽  
J.P. Pontigo ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Atlantic Salmon Salmo Salar

Responses of Kidney, Liver, Muscle, and Bone in Atlantic Salmon (Salmo salar) to Diet and Liming in Acidic Nova Scotia Rivers

1990 ◽  
Vol 47 (12) ◽  
pp. 2441-2450 ◽  
Author(s):  
H. S. Majewski ◽  
S. B. Brown ◽  
R. E. Evans ◽  
H. C. Freeman ◽  
J. F. Klaverkamp
Keyword(s):  
Ascorbic Acid ◽  
Nova Scotia ◽  
Atlantic Salmon ◽  
River Water ◽  
Salmo Salar ◽  
Liver Glycogen ◽  
Adaptive Mechanism ◽  
Atlantic Salmon Salmo Salar ◽  
Ph Range ◽  
Kidney Liver

Two-year old sexually maturing Atlantic salmon (Salmo salar) were held in the Medway (pH range 5.2–5.6) and WestfieSd (pH range 4.7–5.2) rivers of Nova Scotia for 149 and 126 d respectively, in successive years (1985 and 1986). Exposure to Westfield river water resulted in a depletion of renal and hepatic acid-soluble thiol (AST) and of renal ascorbic acid (AsA) reserves in both years. Liming, or the feeding of a high-salt (3.0% NaCl) diet, failed to maintain completely these reserves at levels found in Medway river salmon. In 1986 declines in bone (Ca and P) and muscle (Na and K) electrolytes were coincidental to elevations in liver glycogen, suggesting that gluconeogenesis was an adaptive mechanism in response to the ionoregulatory effects associated with acidic and low ambient calcium conditions. The addition of lime to Westfield river water restored muscle electrolyte levels, but had no effect on depleted bone Ca and P levels.

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