Rate of Conversion of 14C-p,p′ -DDT to p,p′ -DDE by Brook Trout (Salvelinus fontinalis): Absence of Effect of Pretreatment of Fish with Compounds Related to p,p′ -DDT

1977 ◽  
Vol 34 (1) ◽  
pp. 119-122 ◽  
Author(s):  
R. F. Addison ◽  
M. E. Zinck
Keyword(s):  
Lipid Content ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Tissue Concentrations ◽  
Highly Correlated

Brook trout (Salvelinus fontinalis) fingerlings were given four injections at weekly intervals of either p,p′ -DDT, p,p′ -DDE, p,p′-DDD, or p,p′ -DDMU to yield tissue concentrations of 1–5 mg/kg wet wt. The effect of these treatments on the subsequent dehydrochlorination of an injection of 14C-p,p′ -DDT was investigated. The rate of dehydrochlorination of 14C-p,p′ -DDT by the trout was not influenced by these treatments and was more highly correlated with factors such as the weight of the fish and their lipid content. Of the compounds injected during the treatment of the fish, p,p′ -DDMU was cleared more rapidly than the others.

Concentrations of nucleic acids and protein as indices of nutritional status for recently emerged brook trout (Salvelinus fontinalis)

1995 ◽  
Vol 52 (4) ◽  
pp. 848-854 ◽  
Author(s):  
Robert L. McLaughlin ◽  
Moira M. Ferguson ◽  
David L. G. Noakes
Keyword(s):  
Nutritional Status ◽  
Nucleic Acids ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Life Stage ◽  
Fork Length ◽  
Tissue Concentrations ◽  
Dna And Rna ◽  
Wild Trout ◽  
Rna And Dna

We examined whether concentrations of nucleic acids and protein sampled from muscle tissue were useful indicators of nutritional status for recently emerged brook trout (Salvelinus fontinalis). Trout collected from the field were maintained in the laboratory under two food treatments: fed versus food deprived. Concentrations of RNA and DNA, and RNA/DNA ratio did not differ significantly between fed and food-deprived trout, but fed trout had higher concentrations of protein and were 20% heavier at a given fork length than food-deprived trout. Wild trout fed in the laboratory had lower concentrations of RNA, DNA, and protein, and lower RNA/DNA ratios than did trout in the field, but were significantly heavier for their fork length. Tissue concentrations of protein may provide an index of nutritional status for recently emerged brook trout while concentrations of nucleic acids apparently do not. It is important to ensure that concentrations of nucleic acids and protein reflect nutritional status adequately for the species and life stage of interest before using these indices to assess the condition of fish in the field.

Parasite-induced susceptibility to predation in diplostomiasis

Parasitology ◽  
1982 ◽  
Vol 85 (3) ◽  
pp. 495-501 ◽  
Author(s):  
P. Brassard ◽  
M. E. Rau ◽  
M. A. Curtis
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Marked Decrease ◽  
Infected Fish ◽  
Induced Susceptibility ◽  
Diplostomum Spathaceum

Guppies (Lebistes reticulatis) exposed to doses as low as 25 cercariae of Diplostomum spathaceum for 30 min were consistently and significantly more susceptible to predation by brook trout (Salvelinus fontinalis) than uninfected controls. The increase in susceptibility to predation was correlated with a marked decrease in the activity of infected fish.

scholarly journals Brook trout passage performance through culverts

2016 ◽  
Vol 73 (1) ◽  
pp. 94-104 ◽  
Author(s):  
Elsa Goerig ◽  
Theodore Castro-Santos ◽  
Normand Émile Bergeron
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Structural Characteristics ◽  
Passive Integrated Transponder ◽  
Complex Interactions ◽  
Factors Influencing ◽  
Several Variables ◽  
And Behavior ◽  
Steep Slopes ◽  
Corrugated Metal

Culverts can restrict access to habitat for stream-dwelling fishes. We used passive integrated transponder telemetry to quantify passage performance of >1000 wild brook trout (Salvelinus fontinalis) attempting to pass 13 culverts in Quebec under a range of hydraulic and environmental conditions. Several variables influenced passage success, including complex interactions between physiology and behavior, hydraulics, and structural characteristics. The probability of successful passage was greater through corrugated metal culverts than through smooth ones, particularly among smaller fish. Trout were also more likely to pass at warmer temperatures, but this effect diminished above 15 °C. Passage was impeded at higher flows, through culverts with steep slopes, and those with deep downstream pools. This study provides insight on factors influencing brook trout capacity to pass culverts as well as a model to estimate passage success under various conditions, with an improved resolution and accuracy over existing approaches. It also presents methods that could be used to investigate passage success of other species, with implications for connectivity of the riverscape.

Food Specialization By Individual Trout

1972 ◽  
Vol 29 (11) ◽  
pp. 1615-1624 ◽  
Author(s):  
James E. Bryan ◽  
P. A. Larkin
Keyword(s):  
Rainbow Trout ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Stomach Contents ◽  
Cutthroat Trout ◽  
Salmo Gairdneri ◽  
Potential Prey ◽  
Repeated Observation ◽  
Size Growth ◽  
Salmo Clarki

Analyses of stomach contents showed that the kinds of prey eaten by brook trout (Salvelinus fontinalis), cutthroat trout (Salmo clarki), and rainbow trout (Salmo gairdneri) were seldom distributed at random among the individuals. Repeated observation of food eaten by individuals in a stream and ponds showed that prey types were eaten in proportions which were characteristic for an individual.Specialization occurred on several different kinds of prey. Although the degree of specialization was higher during shorter intervals, the data suggested that some specialization persisted for half a year. There were no striking correlations between degree of specialization and other individual properties such as size, growth rate, weight of food, number of food items, previous specialization, or area of recapture.In addition to the observations on trout in relatively undisturbed habitats, a field experiment was conducted using laboratory-reared rainbow trout held in small ponds. The food of each trout in the experiment was sampled repeatedly. In analysis of variance, interaction among the individuals and kinds of prey eaten showed that food specialization occurred. Both the absolute and relative abundance of potential prey were constant during the experiment.

scholarly journals Concomitant Antibiotic and Mercury Resistance Among Gastrointestinal Microflora of Feral Brook Trout, Salvelinus fontinalis

2012 ◽  
Vol 65 (5) ◽  
pp. 575-582 ◽  
Author(s):  
Matthew M. Meredith ◽  
Erin M. Parry ◽  
Justin A. Guay ◽  
Nicholas O. Markham ◽  
G. Russell Danner ◽  
...  
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Mercury Resistance ◽  
Gastrointestinal Microflora
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