Plasma cortisol response to stress in juvenile rainbow trout is influenced by their life history during early development and by egg cortisol content

2008 ◽  
Vol 158 (3) ◽  
pp. 234-239 ◽  
Author(s):  
B. Auperin ◽  
M. Geslin
Keyword(s):  
Life History ◽  
Rainbow Trout ◽  
Early Development ◽  
Plasma Cortisol ◽  
Cortisol Response ◽  
Juvenile Rainbow Trout ◽  
Response To Stress

Is plasma cortisol response to stress in rainbow trout regulated by catecholamine-induced hyperglycemia?

2014 ◽  
Vol 205 ◽  
pp. 207-217 ◽  
Author(s):  
Manuel Gesto ◽  
Cristina Otero-Rodiño ◽  
Marcos A. López-Patiño ◽  
Jesús M. Míguez ◽  
José L. Soengas ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Plasma Cortisol ◽  
Cortisol Response ◽  
Response To Stress

Individual variation and interrelationships between swimming performance, growth rate, and feeding in juvenile rainbow trout (Oncorhynchus mykiss)

1998 ◽  
Vol 55 (7) ◽  
pp. 1583-1590 ◽  
Author(s):  
T Ryan Gregory ◽  
Chris M Wood
Keyword(s):  
Growth Rate ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Plasma Cortisol ◽  
Positive Relationship ◽  
Swimming Performance ◽  
Individual Performance ◽  
Significant Positive Relationship ◽  
Juvenile Rainbow Trout ◽  
Rainbow Trout Oncorhynchus Mykiss

Variation among individuals in specific growth rate (SGR), feeding, and two measures of swimming performance and their possible interrelationships were investigated in juvenile rainbow trout (Oncorhynchus mykiss) kept in groups on either satiation or half-satiation rations. Maximum sustainable velocity (Ucrit) was measured as an index of aerobic swimming performance and stamina (fatigue time in a fixed-velocity test at 6 body lengths ·s-1) as an index of anaerobic performance. Individual performance in both of these tests was found to be significantly repeatable. Trout fed on half-satiation ration exhibited significantly lower mean values of SGR and body size and higher levels of aggression-related fin damage, but no significant differences in stamina, relative or absolute Ucrit, glycogen content, or plasma cortisol. However, in these fish, there was a significant negative relationship between SGR and relative Ucrit, a significant positive relationship between SGR and stamina, and a significant positive relationship between SGR and total daily meal. None of these relationships were seen in fish fed to satiation. Plasma cortisol and tissue glycogen stores were not related to SGR. These results indicate that under the intensified competition of restricted ration, there are trade-offs between growth, feeding, and different types of swimming performance.

Effect of Prior Acid Exposure on Physiological Responses of Juvenile Rainbow Trout (Salmo gairdneri) to Acute Handling Stress

1985 ◽  
Vol 42 (4) ◽  
pp. 710-717 ◽  
Author(s):  
Bruce A. Barton ◽  
Gary S. Weirter ◽  
Cars B. Schreck
Keyword(s):  
Rainbow Trout ◽  
Plasma Glucose ◽  
Plasma Cortisol ◽  
Acid Stress ◽  
Peak Level ◽  
Acid Exposure ◽  
Salmo Gairdneri ◽  
Plasma Sodium ◽  
Handling Stress ◽  
Juvenile Rainbow Trout

Acid-stressed fish appear to be more sensitive to additional stressors than unstressed fish. When juvenile rainbow trout, Salmo gairdneri, were exposed to acid conditions (pH 5.7–4.7) for 5 d, plasma cortisol was affected only slightly during the initial hours of exposure, but plasma glucose and hematocrit increased, and plasma sodium decreased. However, when fish held at pH 4.7 were subsequently subjected to a 30-s handling stress, poststress plasma cortisol rose to a peak level of more than twice that in handled fish held at ambient pH (6.6). Effects of handling on plasma glucose or sodium were not apparent against levels already altered by the chronic acid exposure, judging by the corticosteroid response, we conclude that the acid-stressed fish were more sensitive to additional handling, even though they appeared to be physiologically normal after 5 d. Thus, as a management consideration, when fish are stocked in acidified waters, care should be taken to avoid situations where the fish may encounter additional disturbances in the new environment. Plasma glucose and sodium were better indicators of chronic acid stress alone than plasma cortisol, but the greater cortisol response to handling at low pH may be a useful method of detecting increased interrenal activity during early stages of environmental acidification.

scholarly journals Quantitative trait loci for magnitude of the plasma cortisol response to confinement in rainbow trout

2014 ◽  
Vol 45 (2) ◽  
pp. 223-234 ◽  
Author(s):  
E. Quillet ◽  
F. Krieg ◽  
N. Dechamp ◽  
C. Hervet ◽  
A. Bérard ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Plasma Cortisol ◽  
Cortisol Response ◽  
Trait Loci

Sublethal Effects of Tetrachloroguaiacol on Juvenile Rainbow Trout, Oncorhynchus mykiss, following Acute and Chronic Exposure

1994 ◽  
Vol 51 (9) ◽  
pp. 1967-1974 ◽  
Author(s):  
J. A. Johansen ◽  
C. J. Kennedy ◽  
R. M. Sweeting ◽  
A. P. Farrell ◽  
B. A. McKeown
Keyword(s):  
Disease Resistance ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Chronic Exposure ◽  
Plasma Cortisol ◽  
Sublethal Effects ◽  
Swimming Performance ◽  
Juvenile Rainbow Trout ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Acute And Chronic Exposure

Following either a 24-h (acute) or 25-d (chronic) exposure to tetrachloroguaiacol (TeCG), a component of bleached kraft mill effluent (BKME), juvenile rainbow trout, Oncorhynchus mykiss, were examined for effects on several biochemical parameters, swimming performance, and disease resistance. Acute exposure resulted in increased levels of plasma cortisol and lactate and reductions in liver glycogen and protein, spleen somatic index, leucocrit, hemoglobin, swimming performance, and disease resistance. Chronic exposure resulted in most parameters remaining at control levels with the exception of leucocrit which was elevated, plasma cortisol which decreased, and disease resistance which was impaired. These findings correlate well with a previously proposed classic stress response for mammals and are generally consistent with studies in which fish were exposed to whole BKME. The 96-h LC50 for juvenile rainbow trout exposed to TeCG was estimated at 0.37 mg∙L−1.

Attenuation of the cortisol response to stress in female rainbow trout chronically exposed to dietary selenomethionine

2011 ◽  
Vol 105 (3-4) ◽  
pp. 643-651 ◽  
Author(s):  
Steve Wiseman ◽  
Jith K. Thomas ◽  
Landon McPhee ◽  
Olesya Hursky ◽  
Jason C. Raine ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Cortisol Response ◽  
Response To Stress

scholarly journals Duress without stress: Cryptobia infection results in HPI axis dysfunction in rainbow trout

2013 ◽  
Vol 218 (3) ◽  
pp. 287-297 ◽  
Author(s):  
Barry N Madison ◽  
Patrick T K Woo ◽  
Nicholas J Bernier
Keyword(s):  
Gene Expression ◽  
Rainbow Trout ◽  
Plasma Cortisol ◽  
Head Kidney ◽  
Infected Fish ◽  
Control Fish ◽  
Cortisol Response ◽  
Mrna Levels ◽  
Air Exposure ◽  
Hpi Axis

Despite clear physiological duress, rainbow trout (Oncorhynchus mykiss) infected with the pathogenic haemoflagellateCryptobia salmositicado not appear to mount a cortisol stress response. Therefore, we hypothesized that the infection suppresses the stress response by inhibiting the key effectors of the hypothalamic–pituitary–interrenal (HPI) axis. To test this, we characterized the basal activity of the HPI axis and the cortisol response to air exposure in saline- and parasite-injected fish. All fish were sampled at 4 and 6 weeks post-injection (wpi). While both the treatment groups had resting plasma cortisol levels, the parasite-infected fish had lower levels of plasma ACTH than the control fish. Relative to the control fish, the infected fish had higher mRNA levels of brain pre-optic area corticotrophin-releasing factor (CRF) and pituitary CRF receptor type 1, no change in pituitary POMC-A1, -A2 and -B gene expression, higher and lower head kidney melanocortin 2 receptor mRNA levels at 4 and 6 wpi respectively and reduced gene expression of key proteins regulating interrenal steroidogenesis: StAR, cytochrome P450scc and 11β-hydroxylase. The parasite-infected fish also had a reduced plasma cortisol response to a 60-s air exposure stressor. Superfusion of the head kidney tissues of the parasite-infected fish led to significantly lower ACTH-stimulated cortisol release rates than that observed in the control fish. These novel findings show that infection of rainbow trout withC. salmositicaresults in complex changes in the transcriptional activity of both central and peripheral regulators of the HPI axis and in a reduction in the interrenal capacity to synthesize cortisol.

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