Within-River Spawning Migration of Atlantic Salmon (Salmo salar)

1988 ◽  
Vol 45 (10) ◽  
pp. 1691-1698 ◽  
Author(s):  
Tor G. Heggberget ◽  
Lars P. Hansen ◽  
Tor F. Næsje
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Donor Site ◽  
Migration Pattern ◽  
Male And Female ◽  
Atlantic Salmon Salmo Salar ◽  
Capture Site ◽  
Low Degree ◽  
Donor Area ◽  
River Migration

The migration pattern of adult spawners of Atlantic salmon (Salmo salar) in two Norwegian streams was analysed by ultrasonic and mechanical tagging to investigate within-river migration. Salmon were tagged in the estuary as they approached the river before spawning. They displayed a systematic and directional upstream pattern of movement in the river. Seventy-one percent of the fish transplanted 6 km downstream from the capture site about 2 mo before spawning returned to the donor area. Fish transported 7 km upstream from the capture site exhibited a low degree of backtracking to the donor site (one of seven fish). Mechanical tagging of salmon on spawning grounds showed that both male and female spawners released 150 and 600 m upstream from the spawning area were able to return to the original site of spawning with a mean precision of 87%. In both streams, the migration pattern and the return to original site of capture support the hypothesis of local homing of Atlantic salmon, although some fish stray to other areas of the stream.

Changes in Plasma T4 and T3 Levels during Reconditioning and Rematuration in Male and Female Wild Atlantic Salmon (Salmo salar) Kelts Held in Freshwater under Two Photoperiod Regimes

1991 ◽  
Vol 48 (12) ◽  
pp. 2443-2448 ◽  
Author(s):  
J. G. Eales ◽  
D. G. Cyr ◽  
K. Finnson ◽  
C. E. Johnston
Keyword(s):  
Plasma Level ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Early Spring ◽  
Reproductive State ◽  
Male And Female ◽  
Atlantic Salmon Salmo Salar ◽  
17Β Estradiol ◽  
Males And Females ◽  
Low Levels

The plasma level of L-thyroxine (T4) of wild reconditioned Atlantic salmon (Salmo salar) kelts held in freshwater at seasonal temperatures on a natural simulated photoperiod showed a robust seasonal profile with a marked peak in early spring followed by low levels throughout the summer. Plasma T4 was low in kelts that did not recondition and was uninfluenced by gender, eventual reproductive state, or imposition of a 6-mo compressed photocycle. The plasma 3,5,3′-triiodo-L-thyronine (T3) level also rose in spring in both males and females. In males and nonreproducing females, plasma T3 remained high during the growth phase in summer and decreased in fall and winter. Plasma T3 was very low in nonfeeding fish and showed some influence by the 6-mo compressed photocycle. Plasma T3 was particularly low in females at the time of vitellogenesis when 17β-estradiol was high. It is concluded that in reconditioned Atlantic salmon kelts, levels of plasma T4 and T3 appear to be controlled independently and that plasma T3 is more susceptible than T4 to vitellogenic state and other factors relating to metabolic demands.

Energetic cost of spawning in male and female Atlantic salmon (Salmo salar L.)

1991 ◽  
Vol 39 (5) ◽  
pp. 739-744 ◽  
Author(s):  
N. Jonsson ◽  
B. Jonsson ◽  
L. P. Hansen
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Energetic Cost ◽  
Male And Female ◽  
Atlantic Salmon Salmo Salar

Effects of training on functional variables of muscles in reared Atlantic salmon Salmo salar smolts: connection to downstream migration pattern

2011 ◽  
Vol 78 (2) ◽  
pp. 552-566 ◽  
Author(s):  
K. Anttila ◽  
E. Jokikokko ◽  
J. Erkinaro ◽  
M. Järvilehto ◽  
S. Mänttäri
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Downstream Migration ◽  
Migration Pattern ◽  
Atlantic Salmon Salmo Salar

scholarly journals Diel migration pattern of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) smolts: an assessment of environmental cues

2016 ◽  
Vol 26 (4) ◽  
pp. 541-551 ◽  
Author(s):  
Tormod Haraldstad ◽  
Frode Kroglund ◽  
Torstein Kristensen ◽  
Bror Jonsson ◽  
Thrond O. Haugen
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Salmo Trutta ◽  
Migration Pattern ◽  
Environmental Cues ◽  
Diel Migration ◽  
Sea Trout ◽  
Atlantic Salmon Salmo Salar

scholarly journals Expression analysis of sex-determining pathway genes during development in male and female Atlantic salmon (Salmo salar)

2015 ◽  
Vol 47 (12) ◽  
pp. 581-587 ◽  
Author(s):  
Krzysztof P. Lubieniecki ◽  
Natasha A. Botwright ◽  
Richard S. Taylor ◽  
Brad S. Evans ◽  
Mathew T. Cook ◽  
...  
Keyword(s):  
Gene Expression ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Time Course ◽  
Developmental Stages ◽  
Sex Differentiation ◽  
Male And Female ◽  
Expression Levels ◽  
Atlantic Salmon Salmo Salar ◽  
The Cross

We studied the expression of 28 genes that are involved in vertebrate sex-determination or sex-differentiation pathways, in male and female Atlantic salmon ( Salmo salar) in 11 stages of development from fertilization to after first feeding. Gene expression was measured in half-sibs that shared the same dam. The sire of family 1 was a sex-reversed female (i.e., genetically female but phenotypically male), and so the progeny of this family are all female. The sire of family 2 was a true male, and so the offspring were 50% male and 50% female. Gene expression levels were compared among three groups: 20 female offspring of the cross between a regular female and the sex-reversed female ( family 1, first group), ∼10 females from the cross between a regular female and a regular male ( family 2, second group) and ∼10 males from this same family ( family 2, third group). Statistically significant differences in expression levels between males and the two groups of females were observed for two genes, gsdf and amh/mis, in the last four developmental stages examined. SdY, the sex-determining gene in rainbow trout, appeared to be expressed in males from 58 days postfertilization (dpf). Starting at 83 dpf, ovarian aromatase, cyp19a, expression appeared to be greater in both groups of females compared with males, but this difference was not statistically significant. The time course of expression suggests that sdY may be involved in the upregulation of gsdf and amh/mis and the subsequent repression of cyp19a in males via the effect of amh/mis.

Differences in fat accumulation between immature male and female Atlantic salmon Salmo salar after dietary administration of tetradecylthioacetic acid

2016 ◽  
Vol 89 (4) ◽  
pp. 2085-2097 ◽  
Author(s):  
J.-E. Dessen ◽  
R. Arge ◽  
M. S. Thomassen ◽  
K.-A. Rørvik
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Male And Female ◽  
Fat Accumulation ◽  
Tetradecylthioacetic Acid ◽  
Immature Male ◽  
Atlantic Salmon Salmo Salar

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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