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.

Cardiac Responses to a Natural Odorant as Evidence of a Sensitive Period for Olfactory Imprinting in Young Atlantic Salmon, Salmo salar

1989 ◽  
Vol 46 (1) ◽  
pp. 122-130 ◽  
Author(s):  
Pierre-Philippe Morin ◽  
Julian J. Dodson ◽  
François Y. Doré
Keyword(s):  
Heart Rate ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Age Groups ◽  
Sensitive Period ◽  
Age Group ◽  
Olfactory Recognition ◽  
Atlantic Salmon Salmo Salar ◽  
Cardiac Responses ◽  
Olfactory Imprinting

Olfactory imprinting was assessed in young Atlantic salmon, Salmo salar, undergoing smoltification (parr–smolt transition) by measuring their cardiac responses to a natural odorant, L-cysteine. Condition factor and body coloration were used for characterizing the degree of smoltification. In Experiment 1, heart rate conditioning to L-cysteine was used to compare olfactory learning between fish from different age groups of smoltification. In Experiments 2 and 3, other fish from the same age groups of smoltification were exposed to L-cysteine and their long-term olfactory memory was assessed by measuring their unconditioned cardiac responses to L-cysteine after smoltification. In Experiment 2, the time from the end of odor exposure to testing for olfactory recognition was kept constant for ail age groups of smoltification whereas in Experiment 3, the age of fish tested for olfactory recognition was kept constant. Greater conditioning (heart rate reduction) to L-cysteine occurred in age-groups 3 (612–619 d since birth) and 6 (642–649 d) as compared with any other age group of smoltification. Fish tested for odor recognition exhibited a greater unconditioned response (cardiac deceleration) to L-cysteine if they belonged to age-group 3 than to any other age group of smoltification. Our results demonstrated the existence of a sensitive period for olfactory imprinting in Atlantic salmon that occurred between 21 and 28 d after the onset of smoltification induced in the laboratory.

Activity of metabolic enzymes and muscle-specific gene expression in parr and smolts Atlantic salmon Salmo salar L. of different age groups

2017 ◽  
Vol 43 (4) ◽  
pp. 1117-1130 ◽  
Author(s):  
Maria V. Churova ◽  
Olga V. Meshcheryakova ◽  
Aleksey E. Veselov ◽  
Denis A. Efremov ◽  
Nina N. Nemova
Keyword(s):  
Gene Expression ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Age Groups ◽  
Metabolic Enzymes ◽  
Specific Gene ◽  
Specific Gene Expression ◽  
Atlantic Salmon Salmo Salar

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 Two Insecticides on the Vulnerability of Atlantic Salmon (Salmo salar) Parr to Brook Trout (Salvelinus fontinalis) Predation

1972 ◽  
Vol 29 (1) ◽  
pp. 27-29 ◽  
Author(s):  
C. T. Hatfield ◽  
J. M. Anderson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Learning Ability ◽  
Laboratory Work ◽  
Organophosphate Insecticide ◽  
Safe Haven ◽  
Noticeable Effect ◽  
Atlantic Salmon Salmo Salar

The experiments were conducted in large outdoor concrete pools in which the salmon had access to a safe haven. After exposure for 24 hr to 1.0 ppm of the organophosphate insecticide, Sumithion, Atlantic salmon (Salmo salar) parr were more vulnerable than unexposed fish to prédation by large brook trout (Salvelinus fontinalis). Sumithion at 0.1 ppm, and DDT at 0.07 ppm, had no noticeable effect. The results, particularly for Sumithion, correlate well with previous laboratory work on the effect of insecticides on the learning ability of salmon.

Increase of heart rate without elevation of cardiac output in adult Atlantic salmon (Salmo salar) exposed to acidic water and aluminium

1999 ◽  
Vol 56 (2) ◽  
pp. 184-190 ◽  
Author(s):  
Julie C Brodeur ◽  
Trine Ytrestøyl ◽  
Bengt Finstad ◽  
R Scott McKinley
Keyword(s):  
Heart Rate ◽  
Cardiac Output ◽  
Atlantic Salmon ◽  
Stroke Volume ◽  
River Water ◽  
Salmo Salar ◽  
Exposure Period ◽  
Atlantic Salmon Salmo Salar ◽  
Concomitant Reduction ◽  
Ventral Aorta

Adult Atlantic salmon (Salmo salar) were exposed for 48 h to water from acidified (pH 5.2) Fossbekk River (Norway), with and without 94 µg aluminium (Al)/L added as AlCl3, and to water from circumneutral (pH 6.7) Ims River (Norway) (controls). Cardiac output, heart rate, and stroke volume were monitored throughout the exposure period with Doppler flow probes placed around the ventral aorta of the fish. Fish exposed to Fossbekk River water without added Al showed few physiological disturbances. When 94 µg Al/L was added to Fossbekk River water, most of the fish died before the end of the 48-h exposure period, and a large elevation in heart rate was observed together with a decrease in plasma chloride concentrations and an increase in haematocrit, plasma glucose and plasma cortisol levels. Cardiac output was maintained at basal levels during the first 24 h of exposure because the tachycardia was accompanied by a concomitant reduction of stroke volume. Signs of arrhythmia appeared after 32 h of exposure and were associated with a further decrease in stroke volume that caused cardiac output to decrease below basal levels. The incapacity of the tachycardia to elevate cardiac output and the subsequent death of the fish suggest that this response to low pH and Al is more of a maladaptation reaction than a compensatory or adaptative reaction.

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.

scholarly journals Heart rate and swimming activity as stress indicators for Atlantic salmon (Salmo salar)

Aquaculture ◽  
2021 ◽  
Vol 531 ◽  
pp. 735804 ◽  
Author(s):  
E. Svendsen ◽  
M. Føre ◽  
F. Økland ◽  
A. Gräns ◽  
R.D. Hedger ◽  
...  
Keyword(s):  
Heart Rate ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Swimming Activity ◽  
Stress Indicators ◽  
Atlantic Salmon Salmo Salar ◽  
As Stress
Sign in / Sign up

Export Citation Format

Share Document