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.

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.

Acid-Base Regulation Following Exhaustive Exercise: A Comparison Between Freshwaterand Sea Water-Adapted Rainbow Trout (Salmo Gairdneri)

1989 ◽  
Vol 141 (1) ◽  
pp. 407-418 ◽  
Author(s):  
Y. TANG ◽  
D. G. McDONALD ◽  
R. G. BOUTILIER
Keyword(s):  
Rainbow Trout ◽  
Sea Water ◽  
Environmental Water ◽  
Exhaustive Exercise ◽  
Salmo Gairdneri ◽  
Acid Base ◽  
Genetic Stock ◽  
Arterial Blood ◽  
Blood Ph ◽  
Counter Ions

Blood acid-base regulation following exhaustive exercise was investigated in freshwater- (FW) and seawater- (SW) adapted rainbow trout (Salmo gairdneri) of the same genetic stock. Following exhaustive exercise at 10°C, both FW and SW trout displayed a mixed respiratory and metabolic blood acidosis. However, in FW trout the acidosis was about double that of SW trout and arterial blood pH took twice as long to correct. These SW/FW differences were related to the relative amounts of net H+ equivalent excretion to the environmental water, SW trout excreting five times as much as FW trout. The greater H+ equivalent excretion in SW trout may be secondary to changes in the gills that accompany the adaptation from FW to SW. It may also be related to the higher concentrations of HCO3− as well as other exchangeable counter-ions (Na+ and Cl−) in the external medium in SW compared to FW.

Occurrence of viral haemorrhagic septicaemia in rainbow trout Salmo gairdneri Richardson reared in sea-water

1980 ◽  
Vol 3 (1) ◽  
pp. 21-27 ◽  
Author(s):  
JEANNETTE GASTRIC ◽  
P. KINKELIN
Keyword(s):  
Rainbow Trout ◽  
Sea Water ◽  
Salmo Gairdneri ◽  
Haemorrhagic Septicaemia

Influence of acclimation temperature on the osmotic regulation and survival of rainbow trout (Salmo gairdneri) rapidly transferred from fresh water to sea water

Aquaculture ◽  
1984 ◽  
Vol 40 (4) ◽  
pp. 333-341 ◽  
Author(s):  
Maria N. Alexis ◽  
Elli Papaparaskeva-Papoutsoglou ◽  
Sofronios Papoutsoglou
Keyword(s):  
Rainbow Trout ◽  
Fresh Water ◽  
Sea Water ◽  
Salmo Gairdneri ◽  
Acclimation Temperature ◽  
Osmotic Regulation

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

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.

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