Effects of feed quality and quantity on growth, early maturation and smolt development in hatchery-reared landlocked Atlantic salmon Salmo salar

2014 ◽  
Vol 85 (4) ◽  
pp. 1192-1210 ◽  
Author(s):  
J. R. Norrgård ◽  
E. Bergman ◽  
L. A. Greenberg ◽  
M. Schmitz
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Early Maturation ◽  
Feed Quality ◽  
Atlantic Salmon Salmo Salar

scholarly journals Effects of dietary moisture content of extruded diets on physical feed quality and nutritional response in Atlantic salmon (Salmo salar)

2014 ◽  
Vol 20 (4) ◽  
pp. 451-465 ◽  
Author(s):  
M. Oehme ◽  
T.S. Aas ◽  
H.J. Olsen ◽  
M. Sørensen ◽  
M. Hillestad ◽  
...  
Keyword(s):  
Moisture Content ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Feed Quality ◽  
Atlantic Salmon Salmo Salar

scholarly journals Physical feed quality and starch content causes a biological response in Atlantic salmon (Salmo salar L)

2021 ◽  
Vol 21 ◽  
pp. 100791
Author(s):  
Tor Andreas Samuelsen ◽  
Marie Hillestad ◽  
Hans Jákup Jacobsen ◽  
Tor Johannes Hjertnes ◽  
Hanne Jorun Sixten
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Starch Content ◽  
Biological Response ◽  
Feed Quality ◽  
Atlantic Salmon Salmo Salar

scholarly journals Life-history genotype explains variation in migration activity in Atlantic salmon (Salmo salar).

2021 ◽  
Author(s):  
Petri T Niemela ◽  
Ines Klemme ◽  
Anssi Karvonen ◽  
Pekka Hyvarinen ◽  
Paul V Debes ◽  
...  
Keyword(s):  
Life History ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Life History Strategy ◽  
Dependent Manner ◽  
Life History Variation ◽  
Migration Activity ◽  
Early Maturation ◽  
Atlantic Salmon Salmo Salar ◽  
Activity Measurements

One of the most important life-history continuums is the fast-slow axis, where fast individuals mature earlier than slow individuals. Fast individuals are predicted to be more active than slow individuals; high activity is required to maintain a fast life-history strategy. Recent meta-analyses revealed mixed evidence for such integration. Here, we test whether known life-history genotypes differ in activity expression by using Atlantic salmon (Salmo salar) as a model. In salmon, variation in Vgll3, a transcription co-factor, explains ~40% of variation in maturation timing. We predicted that the allele related to early maturation (vgll3*E) would be associated with increased activity. We used an automated surveillance system to follow ~1900 juveniles including both migrants and non-migrants (i.e. smolt and parr fish, respectively) in semi-natural conditions over 31 days (~580 000 activity measurements). Against our prediction, vgll3 did not explain variation in activity in pooled migrant and non-migrant data. However, in migrants, vgll3 explained variation in activity according to our prediction in a sex-dependent manner. Specifically, in females the vgll3*E allele was related to increasing activity, whereas in males the vgll3*L allele (later maturation allele) was related to increasing activity. These sex-dependent effects might be a mechanism maintaining within-population genetic life-history variation.

Food consumption and growth in maturing Atlantic salmon (Salmo salar)

1999 ◽  
Vol 56 (11) ◽  
pp. 2019-2028 ◽  
Author(s):  
Selina M Stead ◽  
Dominic F Houlihan ◽  
H Anne McLay ◽  
Ray Johnstone
Keyword(s):  
Atlantic Salmon ◽  
Food Consumption ◽  
Salmo Salar ◽  
Growth Rates ◽  
Specific Growth ◽  
Steroid Hormone ◽  
Hormone Levels ◽  
Early Maturation ◽  
Atlantic Salmon Salmo Salar ◽  
Specific Growth Rates

Circulating levels of the steroid hormones 11-ketotestosterone (11-KT) and 17β-estradiol (E2), voluntary food intake, and growth performance were measured in individual Atlantic salmon (Salmo salar) over the year preceding their maturation as grilse. 11-KT and E2 were measured by radioimmunoassay, and X-radiography was used to measure food consumption rates. Two phases of sexual maturation were identified: the early phase (October 1992 - April 1993) was characterized by slowly rising steroid hormone levels concomitant with relatively high rates of food consumption and growth, and in the late phase (May-October 1993), steroid hormone levels increased more rapidly and growth rates decreased in association with inappetence. Significant linear relationships were observed between food consumption and specific growth rates of fish throughout the study (ANCOVA, p < 0.05). Slopes and intercepts of regressions were similar for fish during early maturation, while a lower intercept and steeper slope (ANCOVA, p < 0.05) was observed during the later stages of maturation. In November, January, February, and April, fish in which steroid hormone levels were elevated were significantly heavier than those in which hormone levels were basal. There were no significant differences in specific growth rates (except in February), food consumption, or weight-specific food conversion ratio (except in August and October) associated with maturation status.

Effects of feeding regimes and early maturation on migratory behaviour of landlocked hatchery-reared Atlantic salmon Salmo salar smolts

2014 ◽  
Vol 85 (4) ◽  
pp. 1060-1073 ◽  
Author(s):  
J. R. Norrgård ◽  
E. Bergman ◽  
M. Schmitz ◽  
L. A. Greenberg
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Migratory Behaviour ◽  
Early Maturation ◽  
Atlantic Salmon Salmo Salar ◽  
Feeding Regimes

Longitudinal gradients in threshold sizes for alternative male life history tactics in a population of Atlantic salmon (Salmo salar)

2006 ◽  
Vol 63 (9) ◽  
pp. 2067-2075 ◽  
Author(s):  
Nadia Aubin-Horth ◽  
Jean-Francois Bourque ◽  
Gaetan Daigle ◽  
Richard Hedger ◽  
Julian J Dodson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Threshold Value ◽  
Environmental Data ◽  
Habitat Characteristics ◽  
Early Maturity ◽  
Habitat Features ◽  
Early Maturation ◽  
Atlantic Salmon Salmo Salar ◽  
Longitudinal Gradients

Atlantic salmon (Salmo salar) males may mature early in life in freshwater, rather than maturing after a migration to sea, if their size is above a threshold value. We analyzed the spatiotemporal variation in size and incidence of the early maturity tactic among males over an 8-year period in six subpopulations on two branches of a river and collected environmental data on each site and across the river scape. A positive longitudinal trend in the frequency of early maturing males that was stable over the 8-year period occurred from the mouth to the head of the river. Threshold sizes for early maturation varied among subpopulations; size thresholds for male parr to mature were higher in downstream habitats and lowest upstream. This pattern was consistent in both river branches over the 8-year period and was not related to either the density of parr or site-specific abiotic habitat characteristics. However, the cumulative incidence of habitat features that could impede migration of large individuals increased with increasing upstream distance. Migration costs may contribute to the observed variation in threshold sizes.

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
Sign in / Sign up

Export Citation Format

Share Document