Diel and Seasonal Changes in Resting Levels of Various Blood Parameters in Brook Trout (Salvelinus fontinalis)

1992 ◽  
Vol 49 (5) ◽  
pp. 870-877 ◽  
Author(s):  
Céline Audet ◽  
Guy Claireaux
Keyword(s):  
Thyroid Hormones ◽  
Seasonal Changes ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Plasma Osmolality ◽  
Blood Parameters ◽  
Seasonal Cycles ◽  
Temperature Plasma ◽  
Diel Cycles ◽  
Natural Photoperiod

Plasma osmolality, chloride, glucose, Cortisol, thyroid hormones, and blood hematocrit all varied seasonally in freshwater-adapted, age 1 + brook trout (Salvelinus fontinalis) kept under natural photoperiod and water temperatures. In addition, plasma osmolality, Cortisol, and thyroxine all displayed diel cycles that differed from month to month. High Cortisol levels were related to sexual maturation and possibly to low water temperatures. Seasonal cycles of plasma thyroid hormones did not seem to be influenced by water temperature. Plasma osmolality, chloride, glucose, and thyroxine showed small but significant seasonal changes similar to the variations observed at the time of smoltification in other salmonid species.

Blood parameters in brook trout Salvelinus fontinalis (Mitchill, 1815), affected by columnaris disease

2007 ◽  
Vol 38 (11) ◽  
pp. 1182-1197 ◽  
Author(s):  
Jiří Řehulka ◽  
Bohumil Minařík
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Blood Parameters ◽  
Columnaris Disease

Annual variations in the circulating levels of thyroid hormones in the brook trout, Salvelinus fontinalis, as measured by radioimmunoassay

1977 ◽  
Vol 55 (3) ◽  
pp. 475-481 ◽  
Author(s):  
Bruce A. White ◽  
Nancy E. Henderson
Keyword(s):  
Pilot Study ◽  
Thyroid Hormones ◽  
Plasma Levels ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Plasma Samples ◽  
Annual Variations ◽  
Circulating Levels

Circulating levels of L-thyroxine (T4) and 3,5,3′-triiodo-L-thyronine (T3) in plasma of adult brook trout, Salvelinus fontinalis (Mitchill), were measured by radioimmunoassay. Plasma levels of T4 varied from 0.8 to 3.7 ng/ml and T3 from 2.4 to 8.6 ng/ml over a 12-month period. Maximal levels of both hormones occurred in midspring and minimal levels in early November at the time of spawning. T3 titres were consistently higher than those of T4. All plasma samples were collected between 1030 and 1200 hours. A pilot study suggests that T3 and T4 concentrations also vary on a diurnal basis.

Effect of Long-Term Exposure to Acidf Aluminum, and Low Calcium on Adult Brook Trout (Salvelinus fontimlis). 2. Vitellogenesss and Osmoregulation

1988 ◽  
Vol 45 (9) ◽  
pp. 1633-1642 ◽  
Author(s):  
D. R. Mount ◽  
J. R. Hockett ◽  
W. A. Gern
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Plasma Osmolality ◽  
Low Ph ◽  
Reproductive Physiology ◽  
Treatment Conditions ◽  
Plasma Estradiol ◽  
Survival And Growth ◽  
All Treatment

Adult brook trout (Salvelinus fontinalis) were exposed for 193 d (previtellogenesis to spawning) to six combinations of acid, Al, and low Ca. Survival and growth were reduced by low pH combined with low Ca concentrations. After 41 d of exposure, fish in ail low pH exposures showed depressed plasma osmolality and Na concentrations, but by day 97 this apparent osmoregulatory stress was compensated for in all but the most severe treatment (pH 4.97, 47 μg inorganic Al/L, 0.5 mg Ca/L). At the observed peak of yolking (day 147), fish exposed to this treatment also had mean concentrations of plasma estradiol, vitellogenin, and Ca of only half control values. Fecundity (eggs per female) was significantly reduced as well, but this reduction was due in part to decreased growth. Despite these abnormalities in ionoregulatory and reproductive physiology, fish in all treatment conditions produced mature eggs. Among fish in stressful conditions, individual variation in growth and physiological parameters appeared to be correlated with osmoregulatory status. We hypothesize that the suite of physiological disturbances observed are linked to osmoregulatory impairment.

Physiological Evidence of Acclimation to Acid/Aluminum Stress in Adult Brook Trout (Salvelinus fontinalis). 2. Blood Parameters by Cannulation

1988 ◽  
Vol 45 (9) ◽  
pp. 1597-1605 ◽  
Author(s):  
C. M. Wood ◽  
B. P. Simons ◽  
D. R. Mount ◽  
H. L. Bergman
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Acid Stress ◽  
Blood Gases ◽  
Blood Parameters ◽  
Aluminum Stress ◽  
Acid Base ◽  
Indwelling Catheter ◽  
Acid Ph ◽  
Arterial Blood

Brook trout (Salvelinus fontinalis) exposed for 10 wk to sublethal acid (pH = 5.2) plus Al (150 μg/L) in flowing soft water (Ca2+ = 25 μequiv/L) did not exhibit chronic respiratory disturbance or elevated stress indices, as revealed by sampling of arterial blood gases, acid–base status, glucose, and cortisol via an indwelling catheter. Acclimation occurred, which prevented mortality and greatly attenuated the disturbances of respiratory, acid–base, and stress parameters normally seen upon challenge with more severe acid (pH = 4.8) plus Al conditions (333 μg/L} for 3 d. Ionoregulatory, fluid volume, and hematological disturbances were similarly reduced. Higher water Ca2+ (400 μequiv/L) slightly delayed but did not prevent this suite of toxic responses in naive fish. These disturbances did not occur in naive fish challenged with acid alone (pH = 4.8). However, long-term adaptation to acid alone (pH = 5.2) resulted in elevated glucose and cortisol levels and offered no protection against the more severe acid plus Al challenge. Thus the acclimation was to Al rather than to acidity itself, and low levels of Al may be beneficial to fish under chronic acid stress.

Influence of Light and Temperature on the Reproductive Cycle of the Eastern Brook Trout, Salvelinus fontinalis (Mitchill)

1963 ◽  
Vol 20 (4) ◽  
pp. 859-897 ◽  
Author(s):  
Nancy E. Henderson
Keyword(s):  
Environmental Factors ◽  
Seasonal Changes ◽  
Brook Trout ◽  
Ovarian Development ◽  
Salvelinus Fontinalis ◽  
Average Diameter ◽  
Gonadal Development ◽  
Light Regime ◽  
Male And Female ◽  
First Time

Brook trout were exposed to photoperiods ranging from 4 to 20 hours per day and were held either at 8.5 °C or at 16°. The average diameter of the ova was used as an index of ovarian development while testicular maturation was determined from histological preparations.The gonadal cycles of both male and female trout were markedly affected by different photoperiodic regimes. The influence of long or short photoperiods depends upon the phase of gametogenesis in progress at the time and on the photoperiod in effect during earlier stages of the gonadal cycle. Evidence is presented which suggests that the maturation cycle of the gonads may be regulated by the normal seasonal changes of day length.An accelerated light regime can hasten the time of functional maturity in adult trout, but is without effect when applied to maturing fish in which gametogenesis is taking place for the first time. It is suggested that a stimulative effect of environmental factors is dependent upon maturation of the hypothalamic-hypophyseal mechanism.The rate of gonadal development is the same at 16° as it is at 8.5° provided the fish are exposed to natural day lengths. If fish are subjected to long or to short photoperiods, the gonadal response at 16° is quite different from that at 8.5°.

Exotic “Gill Lice” Species (Copepoda: Lernaeopodidae:SalmincolaSPP.) Infect Rainbow Trout (Oncorhynchus mykiss) and Brook Trout (Salvelinus fontinalis) in the Southeastern United States

2017 ◽  
Vol 103 (4) ◽  
pp. 377-389 ◽  
Author(s):  
Carlos F. Ruiz ◽  
Jacob M. Rash ◽  
Doug A. Besler ◽  
Jackson R. Roberts ◽  
Micah B. Warren ◽  
...  
Keyword(s):  
United States ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Southeastern United States ◽  
Rainbow Trout Oncorhynchus Mykiss
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