An Occurrence of Male Predominance Among Repeat Spawning Atlantic Salmon (Salmo salar)

1970 ◽  
Vol 27 (8) ◽  
pp. 1491-1492 ◽  
Author(s):  
J. Rod MacDonald
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Unusual Case ◽  
Male Predominance ◽  
Atlantic Salmon Salmo Salar ◽  
Saint John

An unusual case of male predominance among Atlantic salmon (Salmo salar) repeat spawners was observed in the Saint John River, N.B., in 1967. A sample of 947 Saint John River salmon (416 grilse and 531 older salmon) contained 91 repeat spawners, 50 (55%) of which were males.

Distribution and Timing of Tag Recoveries from Native and Nonnative Atlantic Salmon (Salmo salar) Released into Big Salmon River, New Brunswick

1976 ◽  
Vol 33 (4) ◽  
pp. 829-833 ◽  
Author(s):  
B. M. Jessop
Keyword(s):  
Atlantic Salmon ◽  
New Brunswick ◽  
Salmo Salar ◽  
Bay Of Fundy ◽  
Commercial Exploitation ◽  
Salmon River ◽  
Atlantic Salmon Salmo Salar ◽  
Saint John

Recaptures of tagged Atlantic salmon (Salmo salar) released as smolts into the Big Salmon River varied between annual releases with no differences found on the basis of native or nonnative origin. Few were recaptured outside the Bay of Fundy. Distant fisheries in Greenland and Newfoundland take few salmon from Big Salmon River and commercial exploitation within the Bay of Fundy is minor, particularly by the former large fishery off the mouth of the Saint John River.

Parr-Smolt Transformation of Atlantic Salmon (Salmo salar): Activities of Two Respiratory Enzymes and Concentrations of Mitochondria in the Liver

1984 ◽  
Vol 41 (1) ◽  
pp. 199-203 ◽  
Author(s):  
Robert L. Blake ◽  
Franklin L. Roberts ◽  
Richard L. Saunders
Keyword(s):  
Cytochrome C ◽  
Atlantic Salmon ◽  
Succinate Dehydrogenase ◽  
Cytochrome C Oxidase ◽  
Salmo Salar ◽  
Energy Resource ◽  
Respiratory Enzymes ◽  
Sample Mean ◽  
Atlantic Salmon Salmo Salar ◽  
Saint John

Hatchery-reared parr and smolts of Atlantic salmon (Salmo salar) derived from spawners of the Big Salmon, Saint John, and Penobscot rivers were analyzed for activity of two respiratory chain enzymes in liver. Cytochrome c oxidase activity was about 15-fold greater in enzyme units than succinate dehydrogenase in all three experimental groups. Smolt sample means for cytochrome c oxidase and succinate dehydrogenase in Big Salmon and Saint John fish were significantly greater than those of parr. Measurements in Big Salmon fish, which had the greatest parr–smolt difference in cytochrome c oxidase units and condition factor, demonstrated a significantly greater smolt sample mean for liver mitochondria concentrations. The results are discussed primarily in relation to the possible role of thyroid hormone in causing a greater potential for aerobic energy generation in liver during smoltification and the utilization of lipid as an energy resource.

Microstructure and texture of fresh and smoked Atlantic salmon, Salmo salar L., fillets from fish reared and slaughtered under different conditions

2001 ◽  
Vol 32 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Sjofn Sigurgisladottir ◽  
Margret S. Sigurdardottir ◽  
Helga Ingvarsdottir ◽  
Ole J. Torrissen ◽  
Hannes Hafsteinsson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar

Persistence of Orally Administered Salmonella enterica Serovars Agona and Montevideo in Atlantic Salmon (Salmo salar L.)

2005 ◽  
Vol 68 (7) ◽  
pp. 1336-1339 ◽  
Author(s):  
L. L. NESSE ◽  
T. LØVOLD ◽  
B. BERGSJØ ◽  
K. NORDBY ◽  
C. WALLACE ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Salmonella Enterica ◽  
Most Probable Number ◽  
Fish Feed ◽  
Internal Organs ◽  
Probable Number ◽  
Atlantic Salmon Salmo Salar ◽  
Gastric Intubation

The objective of our experiments was to study the persistence and dissemination of orally administered Salmonella in smoltified Atlantic salmon. In experiment 1, salmon kept at 15°C were fed for 1 week with feed contaminated with 96 most-probable-number units of Salmonella Agona per 100 g of feed and then starved for 2 weeks. Samples were taken from the gastrointestinal tract and examined for Salmonella 1, 2, 8, 9, 15, and 16 days after the feeding ended. In experiment 2, Salmonella Agona and Montevideo were separately mixed with feed and administered by gastric intubation. Each fish received 1.0 × 108, 1.0 × 106, or 1.0 × 104 CFU. The different groups were kept in parallel at 5 and 15°C and observed for 4 weeks. Every week, three fish in each group were sacrificed, and samples were taken from the skin, the pooled internal organs, the muscle, and the gastrointestinal tract and examined for the presence of Salmonella. The results from the two experiments showed that the persistence of Salmonella in the fish was highly dependent on the dose administered. Salmonella was not recovered from any of the fish that were fed for 1 week with the lowest concentration of Salmonella. In the fish given the highest dose of Salmonella, bacteria persisted for at least 4 weeks in the gastrointestinal tract as well as, to some extent, the internal organs. The present study shows that under practical conditions in Norway, the risk of Salmonella in fish feed being passed on to the consumer of the fish is negligible.

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