Atlantic salmon (Salmo salar) and Coho salmon (Oncorhynchus kisutch) display differential metabolic changes in response to infestation by the ectoparasite Caligus rogercresseyi

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.

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

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f94-059 ◽

1994 ◽

Vol 51 (3) ◽

pp. 567-576 ◽

Cited By ~ 15

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.

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Leaping Behavior of Juvenile Coho (Oncorhynchus kisutch) and Atlantic Salmon (Salmo salar)

Journal of the Fisheries Research Board of Canada ◽

10.1139/f78-146 ◽

1978 ◽

Vol 35 (6) ◽

pp. 907-909 ◽

Cited By ~ 3

Author(s):

Philip E. K. Symons

Keyword(s):

Atlantic Salmon ◽

Key Words ◽

Freshwater Fish ◽

Salmo Salar ◽

Environmental Conditions ◽

Temperature Effects ◽

Species Differences ◽

Oncorhynchus Kisutch ◽

Atlantic Salmon Salmo Salar ◽

Key Words Fish

Juveniles of coho (Oncorhynchus kisutch) and Atlantic salmon (Salmo salar) proved capable of leaping falls at least 5 body lengths in height. No species differences were apparent: both species leapt lower falls (12 cm) more readily than higher ones (27 and 57 cm) and proportionately more leaps occurred on days with temperatures between 14.0 and 17.0 °C than on days with lower temperatures. Key words: fish, freshwater fish, behavior, migrations, environmental conditions, temperature effects

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Comparative Susceptibility of Atlantic (Salmo salar) and Coho (Oncorhynchus kisutch) Salmon to Three Strains ofVibrio anguillarum From The Maine – New Hampshire Coast

Journal of the Fisheries Research Board of Canada ◽

10.1139/f79-043 ◽

1979 ◽

Vol 36 (3) ◽

pp. 280-282 ◽

Cited By ~ 5

Author(s):

Evelyn S. Sawyer ◽

Richard G. Strout ◽

Bonita A. Coutermarsh

Keyword(s):

Atlantic Salmon ◽

Key Words ◽

Salmo Salar ◽

New Hampshire ◽

Marine Bacteria ◽

Coho Salmon ◽

Vibrio Anguillarum ◽

Oncorhynchus Kisutch ◽

Comparative Susceptibility ◽

Water Transmission

Atlantic salmon (Salmo salar) were found to be as susceptible as coho salmon (Oncorhynchus kisutch) to Maine–New Hampshire strains of Vibrio anguillarum used in both injection and water transmission exposure. Exposure to 1–2.5 × 105 organisms/mL of one strain (569) in the water for 1 h killed 80–100% of Atlantic salmon at 10 and 15 °C. Should similar water exposure conditions occur in Maine estuaries, newly released Atlantic salmon smolts may encounter lethal levels of V. anguillarum. Key words: Vibrio anguillarum, Salmo salar, Atlantic salmon, susceptibility, marine bacteria.

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