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

Role of Fat Stores in the Maturation of Male Atlantic Salmon (Salmo salar) Parr

1991 ◽  
Vol 48 (3) ◽  
pp. 405-413 ◽  
Author(s):  
D. K. Rowe ◽  
J. E. Thorpe ◽  
A. M. Shanks
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Gonadosomatic Index ◽  
Total Lipids ◽  
Fat Accumulation ◽  
Atlantic Salmon Salmo Salar ◽  
Mesenteric Fat ◽  
Fat Stores

We provide evidence that in male Atlantic salmon (Salmo salar) parr, maturation is suppressed when mesenteric fat fails to exceed an undefined level by May. In nonmaturing parr the postwinter increase in total lipids began in May, while the mesenteric store started filling in June. However, in male parr which would have matured, total lipids started increasing a month earlier, in April, and the mesenteric store started filling in May. Consequently, maturing male parr had significantly more mesenteric fat than nonmaturing fish by June. Mesenteric fat is needed for maturation. Levels continued to increase in nonmaturing parr during autumn months, but had declined in maturing parr by September. This depletion of mesenteric fat in maturing males coincided with increases in the gonadosomatic index from 0.05 to 10% and with reductions in both feeding and growth. Fasting during spring months delayed increases in total lipids and fat accumulation into the mesenteric store until June and suppressed maturation rates of male parr. The internal decision to suppress maturation is therefore dependent on mesenteric fat levels increasing in May. However, this requires the prior replenishment of other stores in April. A model is proposed to explain the physiological link between fat accumulation during spring and the initiation of maturation.

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

scholarly journals Genome wide response to dietary tetradecylthioacetic acid supplementation in the heart of Atlantic Salmon (Salmo salar L)

BMC Genomics ◽  
2012 ◽  
Vol 13 (1) ◽  
pp. 180 ◽  
Author(s):  
Fabian Grammes ◽  
Kjell-Arne Rørvik ◽  
Magny S Thomassen ◽  
Rolf K Berge ◽  
Harald Takle
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Acid Supplementation ◽  
Tetradecylthioacetic Acid ◽  
Atlantic Salmon Salmo Salar ◽  
Genome Wide

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.

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.

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
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