Homing of Rainbow Trout to Inlet and Outlet Spawning Streams at Loon Lake, British Columbia

1959 ◽  
Vol 16 (5) ◽  
pp. 695-719 ◽  
Author(s):  
C. C. Lindsey ◽  
T. G. Northcote ◽  
G. F. Hartman
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Field Study ◽  
Late Summer ◽  
Salmo Gairdneri ◽  
First Year ◽  
Fish Movement ◽  
Fish Spawn ◽  
Spawning Streams

A four year field study was conducted on rainbow trout (Salmo gairdneri) spawning in the inlet and outlet of Loon Lake. Young and adult trout were trapped and marked in both streams. About 5000 fish spawn in the outlet between mid-March and June; about 22,000 spawn in the inlet between late April and July. Outlet young either enter the lake by late summer or overwinter in the stream and enter the lake next spring or summer. Most inlet young enter the lake in their first year. Return as adults, of fish which had been clipped while entering the lake as young, indicated that about 94% of fish originating from each end homed to their parent stream. Because of the large number of inlet spawners, about a quarter of the outlet spawners are strays which had hatched in the inlet. Recovery of marked fish, movement of adults within the lake, and experimental transfer of adults and young between streams, all indicate that inlet and outlet spawners do not differ genetically in their responses to current. The biological and applied significance of homing, and its possible mechanisms, are discussed.

Nest digging behavior of rainbow trout (Salmo gairdneri)

1970 ◽  
Vol 48 (6) ◽  
pp. 1458-1462 ◽  
Author(s):  
G. F. Hartman
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Wild Population ◽  
Salmo Gairdneri ◽  
Tactile Stimuli ◽  
Digging Behavior ◽  
Nest Digging

A wild population of rainbow trout (Salmo gairdneri) was observed during spawning in the Lardeau River in southeastern British Columbia, in April and May in 1966 and 1967. Nest digging in the first few days of spawning in 1967 was predominantly nocturnal, but diurnal nest digging increased until activity was nearly steady around the clock.Rate of digging (digging bouts per 10-min interval) averaged near five before spawning, rose sharply immediately after spawning, and then decreased. The number of body flexures per bout of digging was near six before spawning, decreased sharply right after spawning, and then rose progressively over a 50-min period. Touching or feeling the bottom of the nest was frequent before spawning and decreased after. The effect of internal stimuli (egg release) and tactile stimuli on digging behavior is considered.

First Record of Bacterial Kidney Disease in an Apparently Wild Salmonid in British Columbia

1973 ◽  
Vol 30 (10) ◽  
pp. 1578-1580 ◽  
Author(s):  
T. P. T. Evelyn ◽  
G. E. Hoskins ◽  
G. R. Bell
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Kidney Disease ◽  
First Record ◽  
Wild Fish ◽  
Salmo Gairdneri ◽  
Bacterial Kidney Disease ◽  
Causative Bacterium

A confirmed case of bacterial kidney disease in a sports-caught rainbow trout (Salmo gairdneri) from Loon Lake, British Columbia, is reported. The case represents the first record of this disease in an apparently wild fish in this province. Descriptions of the affected trout and of the causative bacterium are provided.

The importance of contaminated food for the uptake of heavy metals by rainbow trout (Salmo gairdneri): a field study

Oecologia ◽  
1985 ◽  
Vol 67 (1) ◽  
pp. 82-89 ◽  
Author(s):  
Reinhard Dallinger ◽  
Hannes Kautzky
Keyword(s):  
Heavy Metals ◽  
Rainbow Trout ◽  
Field Study ◽  
Salmo Gairdneri ◽  
Contaminated Food

Lakeward Migration of Young Rainbow Trout (Salmo gairdneri) in the Upper Lardeau River, British Columbia

1969 ◽  
Vol 26 (1) ◽  
pp. 33-45 ◽  
Author(s):  
T. G. Northcote
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Water Temperature ◽  
Water Current ◽  
Salmo Gairdneri ◽  
Field Observations ◽  
Predominant Role ◽  
Emergence Period ◽  
Trout Lake ◽  
Kootenay Lake

Lakeward migration of rainbow trout fry was studied in the upper Lardeau River, where the young emerge from a spawning area immediately below the outlet of Trout Lake utilized by large trout from Kootenay Lake, about 56 km downstream. Most fry move downstream towards Kootenay Lake shortly after emergence; however, some, particularly later in the emergence period, move upstream into Trout Lake. Field observations and experiments suggest that water temperature may be important in inducing different responses to water current in these fish, but may not play such a predominant role or operate at the same levels as proposed earlier for control of young trout migration in the Loon Lake system.

Competition for Food Between Redside Shiners (Richardsonius balteatus) and Rainbow Trout (Salmo gairdneri) in Two British Columbia Lakes

1961 ◽  
Vol 18 (2) ◽  
pp. 203-220 ◽  
Author(s):  
R. E. Johannes ◽  
P. A. Larkin
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Interspecific Competition ◽  
Stomach Contents ◽  
Salmo Gairdneri ◽  
Interspecific Aggression ◽  
Large Numbers ◽  
Competition For Food ◽  
Biological Environment ◽  
Richardsonius Balteatus

The distribution, movements, behaviour and food of trout and shiners in Paul and Pinantan Lakes were studied to determine the items and mechanisms of interspecific competition between them. Data from recent years were compared with data for years when trout alone inhabited the lakes.No interspecific aggression was observed. The possibility that the two species were competing for space was discounted. Stomach contents of shiners in Pinantan Lake revealed a marked qualitative diurnal food cycle. In Paul Lake, shiners have drastically reduced the Gammarus population relative to its pre-shiner abundance, forcing trout, as well as the shiners themselves, to shift their diets to other foods. This overgrazing was caused by the concentration of large numbers of shiners over the shoals where Gammarus are also present in their highest concentrations, and the ability of shiners to pursue food deeper into the weeds and to graze an area more thoroughly than trout. In Pinantan Lake, shiners have apparently reduced the density of Daphnia to a point where trout are unable to feed on them as rapidly as in pre-shiner years. The ability of both species to utilize many types of food tends to reduce the intensity of competition.The study demonstrates how false implications may arise from an appraisal of competition not initiated until after the effects of competition have been observed. If observations had not been made on Paul Lake until after competition had been observed, the importance of Gammarus as an item of competition would probably have been overlooked and the whole competitive relationship misconstrued.Environmental factors and behaviour were shown to be important influences on the dynamics of competition. The physical and biological environment and the distribution and behaviour of competitors may be in states of continual flux in which case the niches of the competitors cannot be considered constant.

The life histories and trophic relationships of the Trichoptera of Marion Lake, British Columbia

1971 ◽  
Vol 49 (5) ◽  
pp. 623-635 ◽  
Author(s):  
Michael J. Winterbourn
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Life Histories ◽  
Oncorhynchus Nerka ◽  
Trophic Relationships ◽  
Salmo Gairdneri ◽  
Taricha Granulosa ◽  
Kokanee Salmon ◽  
Competitive Species ◽  
Species Being

Life histories and trophic relationships of Trichoptera were studied in a small British Columbia lake. Larvae of 10 caddis species were primarily sediment feeders, 2 were leaf feeders, 3 carnivores, and 1 Banksiola crotchi, an algal feeder in early instars and predaceous in later ones. The final instar larvae of potentially competitive species tended to be separated in time. Caddis larvae were an important component of the diet of rainbow trout (Salmo gairdneri), species being preyed upon sequentially as their later instars appeared in the lake. Larvae were also important as prey of the salamander Taricha granulosa but were less significant in the diets of kokanee salmon (Oncorhynchus nerka) and a second salamander Ambystoma gracile.

Report of the metacestode of Paradilepis simoni Rausch, 1949 (Cyclophyllidea: Dilepidae) from fish in British Columbia

1982 ◽  
Vol 60 (2) ◽  
pp. 184-186 ◽  
Author(s):  
Hilda Lei Ching
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Oncorhynchus Nerka ◽  
Salmo Gairdneri ◽  
Size And Shape ◽  
Larval Stages ◽  
Prosopium Williamsoni

Larval stages of tapeworms were found encysted in the livers of the following fish: 77% of 87 Oncorhynchus nerka (Walbaum), kokanee; 22% of 111 Salmo gairdneri (Richardson), rainbow trout; 13% of 113 Ptychocheilus oregonensis (Richardson), northern squawfish; 3% of 98 Prosopium williamsoni (Girard), mountain whitefish; and 2% of 85 Cottus asper (Richardson), prickly sculpin. The metacestodes were identified to be that of Paradilepis simoni from the number, size, and shape of the rostellar hooks.

Genetic and Environmental Sources of Variation in Length and Weight of Rainbow Trout (Salmo gairdneri)

1972 ◽  
Vol 29 (3) ◽  
pp. 237-241 ◽  
Author(s):  
Dag Aulstad ◽  
Trygve Gjedrem ◽  
Harald Skjervold
Keyword(s):  
Rainbow Trout ◽  
Body Length ◽  
First Generation ◽  
Random Mating ◽  
Salmo Gairdneri ◽  
First Year ◽  
Gene Effects ◽  
Sources Of Variation ◽  
One Year ◽  
And Control

Rainbow trout (Salmo gairdneri) of three-year-classes (1967–1969) were produced from random mating, and one-year-class (1970) from inbreeding. The two first-year-classes were fullsib groups. Intraclass-correlations for body length in the 1967-year-class were: 0.16, 0.15, 0.09, and 0.17 at 90, 130, 355, and 485 days of age, respectively. The corresponding estimate for the 68-year-class was 0.25 at age 110 days. Phenotypic correlations between body length at different ages were high within seasons, but low between seasons.For the 1969-year-class the sire x dam interaction component was negative at ages 150 and 280 days, indicating that nonadditive gene effects were unimportant. Estimated heritabilities ranged from 0.0 to 0.40, those from the sire component being generally higher. Environmental differences between tanks were low, but not ignorable. The 1970-year-class, produced from first generation of fullsib mating, showed significant differences between inbred and control (noninbred) for mortality of eggs and fry, but not for body weight at age 75 days.

Demography of populations of deer mice in coastal forest and clear-cut (logged) habitats

1979 ◽  
Vol 57 (8) ◽  
pp. 1636-1648 ◽  
Author(s):  
Thomas P. Sullivan
Keyword(s):  
British Columbia ◽  
Deer Mouse ◽  
Late Summer ◽  
Average Density ◽  
Deer Mice ◽  
First Year ◽  
Coastal Forest ◽  
Juvenile Male ◽  
Clear Cut ◽  
Clear Cutting

This study was designed to test the widely held hypothesis that clear-cut (logged) habitats support higher density populations of Peromyscus than do forested habitats. Deer mouse populations were livetrapped in forest and clear-cut habitats at Maple Ridge, British Columbia, from May 1975 to April 1978. The average density of mice per hectare in the forest was 19.6(1975), 15.8(1976), 22.3(1977), and on the clear-cut areas was 23.3(1975), 16.6(1976), 29.9(1977). The slightly higher number of animals on the clear-cutting in 1975 and 1977 reflected a burst of recruitment in the late summer and fall of each year. The density of mice on clear-cut areas declined during each winter to a level comparable with that of the forest. Juvenile male deer mice were able to enter into the clear-cutting populations during the breeding season in the first year after logging. Recently logged areas may be acting as dispersal or behavioural sinks.

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