Circadian studies of plasma cortisol, thyroid hormone, protein, glucose and ion concentration, liver glycogen concentration and liver and spleen weight in rainbow trout, Salmo gairdneri richardson

1988 ◽  
Vol 89 (3) ◽  
pp. 495-502 ◽  
Author(s):  
C.W. Laidley ◽  
J.F. Leatherland
Keyword(s):  
Rainbow Trout ◽  
Thyroid Hormone ◽  
Plasma Cortisol ◽  
Liver Glycogen ◽  
Ion Concentration ◽  
Salmo Gairdneri ◽  
Spleen Weight ◽  
Glycogen Concentration

Effect of dietary cholecalciferol deficiency on plasma thyroid hormone concentrations in rainbow trout,Salmo gairdneri (Pisces, Salmonidae)

1980 ◽  
Vol 5 (2) ◽  
pp. 167-173 ◽  
Author(s):  
John F. Leatherland ◽  
Brian J. Barnett ◽  
C. Young Cho ◽  
Stanley J. Slinger
Keyword(s):  
Rainbow Trout ◽  
Thyroid Hormone ◽  
Salmo Gairdneri

Changes in plasma insulin and carbohydrate metabolism of zinc-stressed rainbow trout, Salmo gairdneri

1982 ◽  
Vol 60 (9) ◽  
pp. 2079-2084 ◽  
Author(s):  
G. F. Wagner ◽  
B. A. McKeown
Keyword(s):  
Rainbow Trout ◽  
Pancreatic Beta Cells ◽  
Plasma Insulin ◽  
Zinc Sulphate ◽  
Liver Glycogen ◽  
Salmo Gairdneri ◽  
Control Group ◽  
Exposed Fish ◽  
Glucose Levels ◽  
Insulin Radioimmunoassay

An experiment was conducted to determine if the hyperglycemia that is observed in zinc-stressed fish is also accompanied by changes in the levels of plasma insulin and liver glycogen. Juvenile rainbow trout were exposed to three concentrations of zinc sulphate along with a control group over 31 days. Plasma glucose levels were monitored in each group over the course of the experiment. The group demonstrating the most acute and sustained hyperglycemia (0.352 ppm zinc) was then analyzed along with the controls for changes in plasma insulin (using a teleost insulin radioimmunoassay) and liver glycogen levels. Significant depressions in plasma insulin and liver glycogen levels were observed in the zinc-exposed fish when compared with the controls. These changes are discussed with respect to possible influences of epinephrine, which is elevated in stressed fish, and (or) a direct effect of zinc metal on the pancreatic beta cells.

Endrin Toxicosis in Rainbow Trout (Salmo gairdneri)

1973 ◽  
Vol 30 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Blake F. Grant ◽  
Paul M. Mehrle
Keyword(s):  
Rainbow Trout ◽  
Total Protein ◽  
Serum Cortisol ◽  
Liver Glycogen ◽  
Salmo Gairdneri ◽  
Protein Distribution ◽  
Serum Electrolytes ◽  
Electrophoretic Patterns ◽  
Sublethal Doses ◽  
High Doses

In mature rainbow trout (Salmo gairdneri) receiving sublethal doses of endrin (4.3–145 × μg/kg body wt/day in 0.215–7.25 mg/kg of food) for 163 days and then forced to swim for 1 hr, the insecticide affected serum electrolytes, osmolality, total protein, cholesterol, cortisol, lactate, glucose, liver glycogen, and growth. Forced swimming alone altered 9 of 16 serum parameters examined. Apparent increases in serum Na and Cl and significant increases in osmolality and liver glycogen were directly related to dosage. A biphasic distribution of phosphate, total protein, and cholesterol with dosage was apparent. Glucose was increased about 50% by 145 μg/kg but was unaffected by lower doses. Variance analysis of zone electrophoretic patterns disclosed an in teraction between serum protein distribution and dose. Mobilization of liver glycogen was apparently inhibited by low doses and almost totally blocked by high doses. Correspondingly, trout given 14.5 μg/kg or more had lowered serum cortisol levels whereas the lowest dose elevated cortisol. Growth was inhibited appreciably by 145 μg/kg but not by lower doses. Visceral fat accumulated 4.8–8.7 μg endrin/g tissue in the 43 and 145 μg/kg exposures. We conclude that endrin caused dysfunction of physiologic processes critical to survival.

DIFFERENCES IN CONCENTRATIONS OF PLASMA CORTISOL IN THE TROUT AND THE EEL FOLLOWING ADAPTATION TO BLACK OR WHITE BACKGROUNDS

1981 ◽  
Vol 89 (1) ◽  
pp. 135-140 ◽  
Author(s):  
BRIDGET I. BAKER ◽  
THERESA A. RANCE
Keyword(s):  
Rainbow Trout ◽  
Plasma Cortisol ◽  
Binding Capacity ◽  
Anguilla Anguilla ◽  
Short Photoperiod ◽  
Salmo Gairdneri ◽  
Pars Intermedia ◽  
Total Cortisol ◽  
The Difference ◽  
Long Photoperiod

When rainbow trout (Salmo gairdneri) and eels (Anguilla anguilla) were kept in black tanks for 3—4 weeks, their plasma cortisol titres were about fourfold higher than in fish kept in white tanks. In trout, the difference was apparent only under a long photoperiod of 16 h light: 8 h darkness, but in eels the difference was clear under both a long or short photoperiod (9·5 h light: 14·5 h darkness). It is suggested that the increase in plasma cortisol seen in black-adapted fish is dependent on either ACTH or MSH secreted by the pars intermedia melanotrophs. No difference was seen either in the total cortisol-binding capacity of the plasma nor in interrenal histology in trout from black or white backgrounds.

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