Dynamics of Unexploited and Lightly Exploited Populations of Rainbow Trout (Salmo gairdneri) from Coastal, Montane, and Subalpine Lakes in Western Canada

1986 ◽  
Vol 43 (9) ◽  
pp. 1733-1741 ◽  
Author(s):  
D. B. Donald ◽  
D. J. Alger
Keyword(s):  
Rainbow Trout ◽  
Age Structure ◽  
Growth Patterns ◽  
Summer Temperature ◽  
Salmo Gairdneri ◽  
Maximum Longevity ◽  
Subalpine Lake ◽  
Subalpine Lakes ◽  
Class Strength ◽  
Annual Mortality

Populations of rainbow trout (Salmo gairdneri) in one coastal and two montane lakes were characterized by a relatively stable age structure, approximately 50% annual mortality, maximum longevity of 7 yr, and close to linear growth beginning at age 1 or age 2. In contrast, populations in subalpine lakes were characterized by an unstable age structure, large annual variation in recruitment, maximum longevity of 13 yr or more, and growth patterns that were either asymptotic, complex, or linear. Age structure and thus year-class strength was directly related to cumulative summer temperature in one subalpine lake (r = 0.71, N = 11), and in others, strong year-classes were often associated with warm summers. These analyses indicate that the magnitude of recruitment in subalpine lakes was either primarily or at least partly due to annual differences in summer temperature. Longevity was inversely related to midsummer water temperature.

Fish Assemblage Stability in a Southern Appalachian Stream

1988 ◽  
Vol 45 (11) ◽  
pp. 1949-1958 ◽  
Author(s):  
M. C. Freeman ◽  
M. K. Crawford ◽  
J. C. Barrett ◽  
D. E. Facey ◽  
M. G. Flood ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Environmental Variability ◽  
Habitat Characteristics ◽  
Salmo Gairdneri ◽  
Severe Drought ◽  
Resident Species ◽  
Trout Population ◽  
Southern Appalachian ◽  
Class Strength ◽  
Etheostoma Blennioides

We monitored fish populations at three sites in a southern Appalachian stream system during a 40-mo study. Assemblages at two sites, consisting of four and five resident species, were persistent in terms of relative species abundances and production. This persistence was related to low variation in abundance of the two numerically dominant fishes, mottled sculpins (Cottus bairdi) and longnose dace (Rhinichthys cataractae). Less abundant residents, rosyside dace (Clinostomus funduloides), rainbow trout (Salmo gairdneri), and greenside darters (Etheostoma blennioides), displayed lower levels of persistence. We also observed pronounced annual variation in either young-of-the-year recruitment and/or subsequent year-class strength of four resident species, possibly resulting from a severe drought during the third year of study. Abundance and production of rosyside dace and trout were greatly affected by fluctuations in recruitment and year-class strength, suggesting that environmental variability strongly influenced these populations. Density-dependent mechanisms may have regulated sculpin and longnose dace populations. The three-species asssemblage at a third site also was persistent as a result of relatively stable sculpin and longnose dace populations, whereas the rainbow trout population fluctuated among years. We observed significant intersite differences in relative year-class strength in a given year and in population structures of sculpins and longnose dace, suggesting that spatial variation in habitat characteristics affected assemblage dynamics and responses to environmental fluctuations.

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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