scholarly journals Feasibility of rearing brook char fingerlings in an intensive recirculating hatchery as a complementary species to rainbow trout

2016 ◽  
Vol 61 (No. 1) ◽  
pp. 8-14
Author(s):  
M. Buřič ◽  
J. Bláhovec ◽  
J. Kouřil
Keyword(s):  
Rainbow Trout ◽  
Brook Char

The response of stonefly (Plecoptera) nymphs to seasonal increases in predation risk

2002 ◽  
Vol 80 (6) ◽  
pp. 967-972 ◽  
Author(s):  
Nicole A McCutchen
Keyword(s):  
Rainbow Trout ◽  
Predation Risk ◽  
National Park ◽  
Salvelinus Fontinalis ◽  
Substrate Surface ◽  
Lake Outlet ◽  
Harlequin Ducks ◽  
Brook Char ◽  
A Site ◽  
Increases In Risk

The main objective of this study was to determine if predation risk accounted for the patterns of stonefly (Plecoptera) nymph abundance in the Maligne Valley watershed, Jasper National Park, Alberta. Seasonal declines in nymph density corresponded to increased use of the Maligne Lake Outlet and Lower Maligne River by harlequin ducks (Histrionicus histrionicus). Neither decline represented a shift from aperiodic to nocturnal use of surface rocks. Rather, rock use remained aperiodic throughout the season despite increases in risk. The decline that occurred in the Maligne Lake Outlet also did not represent a shift from small to large surface rocks. These results, when combined with the results of an odor experiment, suggest that nymphs tend to avoid surface rocks when in the presence of harlequin ducks. Nymph density did not decline seasonally in the Middle Maligne River, a site free of harlequin ducks but inhabited year-round by brook char (Salvelinus fontinalis) and rainbow trout (Onchorhynchus mykiss). Nymphs in this site as well as those exposed to char odor were nocturnally biased in their use of the substrate surface. Overall, predation risk appears to play a strong role in the patterns of stonefly nymph abundance in the Maligne Valley watershed, although not in the way originally expected.

Influence of water temperature on behavioural interactions between juvenile brook charr, Salvelinus fontinalis, and rainbow trout, Salmo gairdneri

1986 ◽  
Vol 64 (6) ◽  
pp. 1288-1291 ◽  
Author(s):  
Richard A. Cunjak ◽  
John M. Green
Keyword(s):  
Rainbow Trout ◽  
Competitive Advantage ◽  
Salvelinus Fontinalis ◽  
Salmo Gairdneri ◽  
Optimal Temperature ◽  
Brook Charr ◽  
Thermal Range ◽  
Influence Of Water ◽  
Behavioural Interactions ◽  
Brook Char

Interspecific behavioural interactions between paired brook char (Salvelinus fontinalis) and rainbow trout (Salmo gairdneri) were compared at different water temperatures to test the hypothesis that a species realizes a competitive advantage within its optimal thermal range. Three test temperatures were used: 19 °C (optimal temperature for rainbow trout), 13 °C (optimal temperature for brook charr), and 8 °C (below the optima for both species). Brook charr dominated rainbow trout at both 8 and 13 °C. At 19 °C, neither species displayed an obvious competitive advantage. The time (days) to the establishment of a dominance hierarchy reflected specific optimal temperatures; it was shortest for rainbow trout and brook charr at 19 and 13 °C, respectively. The implications of optimal temperatures and competitive ability are discussed in relation to habitat partitioning in the stream environment.

Habitat utilization by brook char (Salvelinus fontinalis) and rainbow trout (Salmo gairdneri) in Newfoundland streams

1983 ◽  
Vol 61 (6) ◽  
pp. 1214-1219 ◽  
Author(s):  
Richard A. Cunjak ◽  
John M. Green
Keyword(s):  
Rainbow Trout ◽  
Habitat Utilization ◽  
Stream Habitat ◽  
Salmo Gairdneri ◽  
Native Fish ◽  
Stream Morphology ◽  
Preferred Habitat ◽  
Microhabitat Preferences ◽  
Brook Char ◽  
Species Segregation

Recent range extension of introduced salmonid species in insular Newfoundland has caused concern over their effects on native fish species. The present study was designed to investigate the stream habitat utilization of the exotic rainbow trout and the native brook char. Results of underwater field observations in a stream where the two species coexisted showed that brook char occupied positions with significantly lower water velocities and more cover than similar-sized rainbow trout. Brook char showed similar microhabitat preferences in a nearby stream where they were allopatric. The extent of species segregation was largely affected by local stream morphology, specifically the availability of preferred habitat. The implications for future introductions of exotic salmonids to native brook char streams are discussed.

The essential oils of some medicinal plants on the immune system of rainbow trout (Oncorhynchus mykiss)

Planta Medica ◽  
2012 ◽  
Vol 78 (11) ◽  
Author(s):  
A Ghasemi Pirbalouti ◽  
E Pirali ◽  
G Pishkar ◽  
S Mohammadali Jalali ◽  
M Reyesi ◽  
...  
Keyword(s):  
Immune System ◽  
Rainbow Trout ◽  
Medicinal Plants ◽  
Oncorhynchus Mykiss ◽  
Essential Oils ◽  
Rainbow Trout Oncorhynchus Mykiss
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