Effects of a temperature rise on melatonin and thyroid hormones during smoltification of Atlantic salmon, Salmo salar

2020 ◽  
Vol 190 (6) ◽  
pp. 731-748
Author(s):  
Laura Gabriela Nisembaum ◽  
Patrick Martin ◽  
Michael Fuentes ◽  
Laurence Besseau ◽  
Elodie Magnanou ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Thyroid Hormones ◽  
Salmo Salar ◽  
Temperature Rise ◽  
Atlantic Salmon Salmo Salar

Effects of Thyroid Hormones on Behavior of Yearling Atlantic Salmon (Salmo salar)

1974 ◽  
Vol 31 (11) ◽  
pp. 1787-1790 ◽  
Author(s):  
J.-G. Godin ◽  
P. A. Dill ◽  
D. E. Drury
Keyword(s):  
Atlantic Salmon ◽  
Thyroid Hormones ◽  
Aggressive Behavior ◽  
Salmo Salar ◽  
Swimming Activity ◽  
Control Fish ◽  
Atlantic Salmon Salmo Salar

Swimming activity, aggressive behavior, and upstream orientation of yearling Atlantic salmon (Salmo salar) treated with 6.43 × 10−11 M thyroxine were significantly lower than those of control fish injected with solvent alone. Two concentrations of triiodothyronine (7.43 × 10−11 M; 7.43 × 10−10 M) caused similar but less pronounced effects.Because similar behavioral modifications accompany smolt migration, we hypothesize that thyroid hormones may play a role in arousing migratory tendencies in Atlantic salmon.

Photoperiod Control of Parr–Smolt Transformation in Atlantic Salmon (Salmo salar): Changes in Salinity Tolerance, Gill Na+,K+-ATPase Activity, and Plasma Thyroid Hormones

1987 ◽  
Vol 44 (8) ◽  
pp. 1462-1468 ◽  
Author(s):  
Stephen D. McCormick ◽  
Richard L. Saunders ◽  
Eugene B. Henderson ◽  
Paul R. Harmon
Keyword(s):  
Atlantic Salmon ◽  
Thyroid Hormones ◽  
Atpase Activity ◽  
Salmo Salar ◽  
Salinity Tolerance ◽  
Continuous Light ◽  
Day Length ◽  
Atlantic Salmon Salmo Salar ◽  
First Feeding ◽  
Photoperiod Control

Atlantic salmon (Salmo salar) were subjected to artificial photoperiods to determine the manner and extent of photoperiod control of the parr–smolt transformation. Exposure to continuous light (L24) at first feeding and maintained throughout the rearing period inhibited increases in salinity tolerance and gill Na+,K+-ATPase activity that occurred in spring in fish raised under simulated natural photoperiod (SNP). Fish reared under continuous light and returned to SNP in October (L24OCT) underwent normal increases in salinity tolerance and gill Na+,K+-ATPase activity, whereas those returned in December (L24DEC) underwent delayed and intermediate increases. Plasma thyroxine peaks occurred simultaneously in all groups but were diminished in the L24 and L24DEC groups. Plasma 3,5,3′-triiodo-L-thyronine levels were not affected by any photoperiod treatment. Inhibition of the parr–smolt transformation decreased the potential for growth in seawater. In spite of changes in the timing of the transformation induced by photoperiod treatment, salinity tolerance and gill Na+,K+-ATPase activity were strongly correlated; correlation between changes in salinity tolerance and plasma thyroid hormones were, by comparison, weak. The results demonstrate that continuous light applied early in ontogeny and maintained throughout the rearing period inhibits osmoregulatory changes associated with parr–smolt transformation, whereas increasing day length during winter–spring stimulates transformation.

Thyroid hormones and gill ATPase during smoltification of Atlantic salmon (Salmo salar)

Aquaculture ◽  
1985 ◽  
Vol 45 (1-4) ◽  
pp. 376 ◽  
Author(s):  
Walton W. Dickhoff ◽  
Craig V. Sullivan ◽  
Conrad V.W. Mahnken
Keyword(s):  
Atlantic Salmon ◽  
Thyroid Hormones ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar

Thyroid Activity Concomitant with Olfactory Learning and Heart Rate Changes in Atlantic Salmon Salmo salar, during Smoltification

1989 ◽  
Vol 46 (1) ◽  
pp. 131-136 ◽  
Author(s):  
Pierre-Philippe Morin ◽  
Julian J. Dodson ◽  
François Y. Doré
Keyword(s):  
Heart Rate ◽  
Atlantic Salmon ◽  
Thyroid Hormones ◽  
Salmo Salar ◽  
Age Groups ◽  
Olfactory Learning ◽  
Learning Ability ◽  
Resting Heart Rate ◽  
Atlantic Salmon Salmo Salar ◽  
Histological Activity

Thyroid-histological (epithelial cell height, follicular eccentricity) and thyroid-radiochemical (thyroxine, triiodothyronine) activities were examined in Atlantic salmon, Salmo salar, undergoing smoltification in relation to cardiac conditioning to L-cysteine (olfactory learning). Changes in plasma levels of thyroxine were also examined along with those of resting heart rate, during and after smoltification. In a related study, we reported greater learning ability in age-groups 3 (612–619 d since birth) and 6 (642–649 d) as well as a greater long-term olfactory memory in age-group 3. In the present study, thyroid-histological activity was correlated with olfactory learning during smoltification. Higher histological values occurred concomitantly with greater learning in age-groups 3 and 6. During smoltification, changes in thyroid-histological activity were different from those of radiochemical activity. Apparently different plasma–tissue fluxes of thyroid hormones occurred between age-groups 3 and 6. Plasma thyroxine was correlated with resting heart rate. Our results suggested that thyroid hormones play a role in olfactory learning and imprinting in anadromous salmonids.

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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