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.

scholarly journals Endocrine changes associated with spawning behavior and social stimuli in a wild population of rainbow trout (Salmo gairdneri)

1986 ◽  
Vol 62 (1) ◽  
pp. 157-167 ◽  
Author(s):  
N.R. Liley ◽  
A. Fostier ◽  
B. Breton ◽  
E.S.P. Tan
Keyword(s):  
Rainbow Trout ◽  
Wild Population ◽  
Salmo Gairdneri ◽  
Spawning Behavior ◽  
Social Stimuli

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.

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.

scholarly journals Endocrine changes associated with spawning behavior and social stimuli in a wild population of rainbow trout (Salmo gairdneri)

1986 ◽  
Vol 62 (1) ◽  
pp. 145-156 ◽  
Author(s):  
N.R. Liley ◽  
B. Breton ◽  
A. Fostier ◽  
E.S.P. Tan
Keyword(s):  
Rainbow Trout ◽  
Wild Population ◽  
Salmo Gairdneri ◽  
Spawning Behavior ◽  
Social Stimuli

The development of Philonema oncorhynchi (Nematoda: Philometridae) in Cyclops bicuspidatus in relation to temperature

1969 ◽  
Vol 47 (3) ◽  
pp. 307-312 ◽  
Author(s):  
Ronald C. Ko ◽  
James R. Adams
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Larval Development ◽  
Sockeye Salmon ◽  
Natural Infection ◽  
Salmo Gairdneri ◽  
Infective Stage ◽  
Final Size ◽  
Rate Of Development ◽  
Larval Stages

Development of Philonema oncorhynchi was followed in Cyclops bicuspidatus kept at 4°, 10°, and 15 °C. The nematode molted twice in the haemocoel of copepods. Three larval stages are described. The final size of the infective stage was unaffected by temperature. The rate of larval development was directly proportional to temperature between 4° and 15 °C. An increase of 5 °C halved the rate. The significance of these findings to the natural infection of sockeye salmon in Cultus Lake, British Columbia, is discussed.The development of P. agubernaculum from the rainbow trout, Salmo gairdneri, was studied at 10 °C by the same methods. Morphological features and rate of development were similar to those of P. oncorhynchi.

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.

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
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