The influence of swimming activity on water balance in the rainbow trout (Salmo gairdneri)

1973 ◽  
Vol 82 (3) ◽  
pp. 257-276 ◽  
Author(s):  
Chris M. Wood ◽  
D. J. Randall
Keyword(s):  
Rainbow Trout ◽  
Water Balance ◽  
Swimming Activity ◽  
Salmo Gairdneri

Onset and rate of drinking in rainbow trout (Salmo gairdneri) following transfer to dilute seawater

1979 ◽  
Vol 57 (10) ◽  
pp. 1863-1865 ◽  
Author(s):  
Roger M. Evans
Keyword(s):  
Rainbow Trout ◽  
Water Balance ◽  
Water Loss ◽  
Sea Water ◽  
Direct Method ◽  
Anguilla Japonica ◽  
Japanese Eel ◽  
Salmo Gairdneri ◽  
Normal Water ◽  
A Direct Method

Seawater-adapted teleosts drink to offset water loss by osmosis. A direct method of monitoring drinking by implanting a fistula to drain the stomach indicated that rainbow trout began drinking from about 9 to 12 (range 1 to 22) h after being placed in 15‰ sea water. Unlike the Japanese eel (Anguilla japonica). in which the onset of drinking has been shown to be immediate and reflex-like, the onset of drinking in trout appears to occur only after appreciable water has been lost to the medium. The trout resembles the eel in that the capacity to shallow water in the absence of postingestional negative feedback exceeds the rate of drinking required to maintain normal water balance.

Electrolyte and Water Balance in Plasma and Urine of Rainbow Trout (Salmo gairdneri) during Chronic Exposure to Cadmium

1984 ◽  
Vol 41 (11) ◽  
pp. 1678-1685 ◽  
Author(s):  
Michael A. Giles
Keyword(s):  
Renal Function ◽  
Rainbow Trout ◽  
Water Balance ◽  
Chronic Exposure ◽  
Plasma Calcium ◽  
Salmo Gairdneri ◽  
Plasma Sodium ◽  
Sodium Potassium ◽  
Urine Production ◽  
Calcium And Magnesium

Rainbow trout (Salmo gairdneri) were exposed to 3.6 and 6.4 μg Cd/L for periods up to 178 d. Transitory changes in plasma calcium and magnesium were observed in fish exposed to 3.6 μg Cd/L although the differences were not significant. Exposure to 6.4 μg Cd/L, however, resulted in significantly lowered plasma sodium, potassium, calcium, and chloride and elevated magnesium concentrations. Analyses of urine indicated that the rate of urine production, osmolality, and sodium, potassium, chloride, magnesium, calcium, and protein concentrations were unaffected by exposure to 3.6 μg Cd/L although slight changes were observed in the first week of exposure. Urine production rate and urinary concentrations of potassium and chloride were unaffected in trout exposed to 6.4 μg Cd/L but sodium, protein, and osmolality were elevated and calcium and magnesium concentrations reduced in these fish. The results demonstrate that the majority of the cadmium-induced electrolyte imbalances do not result from impairment of renal function.

The influence of swimming activity on sodium balance in the rainbow trout (Salmo gairdneri)

1973 ◽  
Vol 82 (3) ◽  
pp. 207-233 ◽  
Author(s):  
Chris M. Wood ◽  
D. J. Randall
Keyword(s):  
Rainbow Trout ◽  
Swimming Activity ◽  
Sodium Balance ◽  
Salmo Gairdneri

Salt and Water Balance in Rainbow Trout (Salmo Gairdneri) Rapidly Transferred from Fresh Water to Sea Water

1979 ◽  
Vol 83 (1) ◽  
pp. 193-202
Author(s):  
R. N. BATH ◽  
F. B. EDDY
Keyword(s):  
Rainbow Trout ◽  
Water Balance ◽  
Sea Water ◽  
Physiological Responses ◽  
Initial Period ◽  
Salmo Gairdneri ◽  
Physiological Changes ◽  
Ionic Content ◽  
Ion Concentrations ◽  
Salt And Water Balance

Physiological responses of rainbow trout (mean weight 13.3 g) to sudden changes in salinity were investigated. An initial period lasting about 8 h was characterized by increased drinking and an increase in plasma and body ions. Fish failed to survive more than 2 days in full strength sea water but in two-thirds sea water there were few mortalities and adaptation was complete in 7–10 days. During this period there were gradual physiological changes resulting in normal plasma ion concentrations but significantly increased body ionic content. The intracellular concentrations of muscle chloride showed the greatest increase.

Temperature, photoperiod, and water–electrolyte balance in rainbow trout, Salmo gairdneri

1977 ◽  
Vol 55 (9) ◽  
pp. 1377-1388 ◽  
Author(s):  
Patrick Murphy ◽  
A. H. Houston
Keyword(s):  
Skeletal Muscle ◽  
Rainbow Trout ◽  
Low Temperature ◽  
Water Balance ◽  
Temperature Effects ◽  
Salmo Gairdneri ◽  
Temperature Perturbation ◽  
Electrolyte Balance ◽  
Influence Of Temperature ◽  
Two Temperature

The influence of temperature and photoperiod upon water–electrolyte balance was considered in animals acclimated to four combinations of two temperature (2, 18 °C) and photoperiod (18 h light–6 h dark, 6 h light–18 h dark) regimes through evaluation of Na, K, Ca, Mg, and Cl levels in plasma, skeletal, and cardiac muscle and liver. Water content and distribution and approximate cellular ion levels were estimated for skeletal muscle and liver. Evidence of significant influence upon water balance was obtained in one-half of the analyses performed, with effects being particularly pronounced in cold-acclimated, 'winter'–photoperiod specimens. Temperature effects were observed in two-thirds of the comparisons made with respect to electrolyte levels. These were not biased in relation to photoperiod. Most significant photoperiod-correlated variations in electrolyte levels (over one-half of the total considered) were observed at low temperature. These observations are discussed in relation to compensation of rainbow trout for temperature perturbation of the osmoregulatory and ionoregulatory systems, and the possible basis of photoperiodic influence upon these responses.

Serum estradiol-17β during the preovulatory development of the rainbow trout (Salmo gairdneri)

1985 ◽  
Vol 110 (1_Suppla) ◽  
pp. S163
Author(s):  
R. SCHULZ ◽  
V. BLÜM
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Serum Estradiol ◽  
Estradiol 17Β

STUDIES ON THE HORMONAL CONTROL OF SODIUM METABOLISM IN THE RAINBOW TROUT (SALMO GAIRDNERI)

1959 ◽  
Vol XXXI (IV) ◽  
pp. 587-602 ◽  
Author(s):  
W. N. Holmes
Keyword(s):  
Rainbow Trout ◽  
Hormonal Control ◽  
Salmo Gairdneri ◽  
Sodium Metabolism
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