Seasonal Mortality of Rainbow Trout (Salmo gairdneri) Planted in Small Eutrophic Lakes of Central Canada

1976 ◽  
Vol 33 (4) ◽  
pp. 647-655 ◽  
Author(s):  
G. Burton Ayles ◽  
J. G. I. Lark ◽  
J. Barica ◽  
Hedy Kling
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Low Oxygen ◽  
Eutrophic Lakes ◽  
Mortality Pattern ◽  
Seasonal Mortality ◽  
Oxygen Levels ◽  
Central Canada ◽  
Causes Of Mortality ◽  
Second Period

The seasonal mortality pattern and the causes of the mortality of planted rainbow trout (Salmo gairdneri) were studied in eight small eutrophic lakes in central Canada used for extensive aquaculture. Two periods of mortality were revealed. The first occurred in all lakes during the first 60 days of residence in the lakes and resulted in the mortality of 60–90% of the numbers of fish stocked. The second period occurred in about 20% of the lakes and was due to low oxygen levels following the collapse of a bloom of Aphanizomenonflos-aquae. Rainbow trout are close to their physiological upper tolerance levels in these lakes. Possible environmental and biological causes of mortality during the first period are discussed.

Oxygen Availability Provides a Signal for Hatching in the Rainbow Trout (Salmo gairdneri) Embryo

1989 ◽  
Vol 46 (1) ◽  
pp. 55-58 ◽  
Author(s):  
Keith E. Latham ◽  
John J. Just
Keyword(s):  
Rainbow Trout ◽  
Developmental Time ◽  
Critical Value ◽  
Oxygen Availability ◽  
Salmo Gairdneri ◽  
Low Oxygen ◽  
Partial Pressures

The hatching of rainbow trout (Salmo gairdneri) embryos can be stimulated by subjecting them to low oxygen partial pressures [Formula: see text] during the final days of incubation or delayed by elevating [Formula: see text]. Most embryos develop the ability to hatch between days 26 and 27 of incubation at 12 °C. During this time, similar hatching frequencies are obtained at any [Formula: see text] below a critical value in the 94–135 mm Hg (6.5–9.3 mg/L) range (1 mm Hg = 133.322 Pa). The [Formula: see text] required for continued incubation increases with developmental time such that hatching cannot be delayed beyond day 30 at 12 °C. These results indicate that oxygen availability influences the time at which trout embryos hatch and that hatching occurs when hatchable embryos are confronted with an ambient [Formula: see text] that is inadequate to satisfy aerobic metabolic requirements.

Effect of Smoke-Processing on Muddy Odor and Taste in Rainbow Trout (Salmo gairdneri)

1972 ◽  
Vol 29 (9) ◽  
pp. 1365-1366 ◽  
Author(s):  
D. G. Iredale ◽  
D. Rigby
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Production Potential ◽  
Valid Method ◽  
Central Canada ◽  
Full Production ◽  
Prairie Lakes

Because of problems with a "muddy" odor and taste occurring in rainbow trout being reared commercially in some small prairie lakes in central Canada, full production potential has not been realized. The possibility of masking the undesirable condition by smoke-processing was investigated and this was found to be a valid method of utilizing the majority of the affected fish.

Temperature Selection of Rainbow Trout (Salmo gairdneri) Fingerlings in Vertical and Horizontal Gradients

1971 ◽  
Vol 28 (11) ◽  
pp. 1801-1804 ◽  
Author(s):  
R. W. McCauley ◽  
W. L. Pond
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Temperature Preference ◽  
Temperature Selection ◽  
Horizontal Gradients ◽  
Significant Difference ◽  
Preferred Temperatures ◽  
Laboratory Investigations ◽  
Horizontal Temperature Gradients ◽  
Selection Of

Preferred temperatures of underyearling rainbow trout (Salmo gairdneri) were determined in both vertical and horizontal temperature gradients. No statistically significant difference was found between the preferred temperatures by the two different methods. This suggests that the nature of the gradient plays a lesser role than generally believed in laboratory investigations of temperature preference.

scholarly journals The Distribution of 35S-Sulfadiazine and 14G-Trimethoprim in Rainbow Trout, Salmo Gairdneri

1979 ◽  
Vol 20 (1) ◽  
pp. 25-37 ◽  
Author(s):  
Torill Bergsjø ◽  
Inger Nafstad ◽  
Kristian Ingebrigtsen
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri
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