Synchronization of ovulation in brook char (Salvelinus fontinalis, Mitchill 1814) using emulsified d-Arg6Pro9NEt sGnRHa

2012 ◽  
Vol 21 (4) ◽  
pp. 783-799 ◽  
Author(s):  
Viktor W. Svinger ◽  
Tomas Policar ◽  
Christoph Steinbach ◽  
Simona Polakova ◽  
Antonin Jankovych ◽  
...  
Keyword(s):  
Salvelinus Fontinalis ◽  
Brook Char

Critique de la méthode de distinction entre poissons anadromes et dulcicoles de la même espèce par la teneur en strontium de leurs écailles

1982 ◽  
Vol 39 (10) ◽  
pp. 1423-1425 ◽  
Author(s):  
Martin Castonguay ◽  
Gérard J. FitzGerald
Keyword(s):  
Salvelinus Fontinalis ◽  
Separate Analysis ◽  
Great Care ◽  
Strontium Content ◽  
Brook Char ◽  
Different Parts

It was not always possible to distinguish between saltwater and freshwater brook char, Salvelinus fontinalis, based on strontium content of scales because of high intra-group variability and low inter-group variability. This method of discrimination between anadromous and freshwater forms should be used with great care. It does not seem possible to determine the freshwater conditions that an anadromous char had previously met by the separate analysis of different parts of the scales. The strontium content of the scales of the saltwater char did not decrease after they were returned to freshwater.

Use of brook char (Salvelinus fontinalis) physiological responses to stress as a teaching exercise.

2000 ◽  
Vol 23 (1) ◽  
pp. S18-23 ◽  
Author(s):  
B Diouf ◽  
P Rioux ◽  
P U Blier ◽  
D Rajotte
Keyword(s):  
Glucose Concentration ◽  
Salvelinus Fontinalis ◽  
Acute Stress ◽  
Blood Glucose Concentration ◽  
Hemoglobin Concentration ◽  
Caudal Vein ◽  
Brook Char ◽  
Hematological Changes ◽  
Physiological Reactions ◽  
Pituitary Adrenal Axis

Fish hematological changes during osmotic and cold stress are used to introduce the physiological reactions of the animal to an acute stress. Brook char (Salvelinus fontinalis) were subjected to 1 h of stress before being anesthetized and having blood taken from their caudal vein. Glucose, hemoglobin, hematocrit, and osmolarity were determined in the blood samples. Analyses showed that glucose concentration tends to increase and hematocrit tends to decrease in stressed fish. Changes in hemoglobin concentration occurred only in cold-stressed fish. A rise in blood glucose concentration is the result of cortisol secreted by the hypothalamic-pituitary-adrenal axis. The glucose produced is used as an osmolyte or energy source to resist or combat the stress. In stressed fish, changes in hematocrit could be the result of the osmoconcentration of the blood plasma, as shown by the increase in osmolarity for the same group. In cold-stressed fish, a decrease in hemoglobin concentration could be the result of hemodilution by body cell water.

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.

Assessing anadromy of brook char (Salvelinus fontinalis) using scale microchemistry

2006 ◽  
Vol 63 (5) ◽  
pp. 995-1006 ◽  
Author(s):  
David A Courtemanche ◽  
Frederick G Whoriskey, Jr. ◽  
Valerie Bujold ◽  
R Allen Curry
Keyword(s):  
Electron Microscopy ◽  
Elemental Composition ◽  
Marine Environment ◽  
Salvelinus Fontinalis ◽  
Fine Scale ◽  
Environment Analysis ◽  
X Ray ◽  
Precise Identification ◽  
Brook Char

Brook char (Salvelinus fontinalis) exist in both freshwater and anadromous forms, often in sympatry, the ecology of the latter being poorly understood. As strontium (Sr) can substitute to calcium (Ca) and as its concentration in seawater is higher than in freshwater, scale circulii laid down during seawater exposure should be enriched in Sr, allowing precise identification of residence patterns in freshwater and seawater. We attempted to document movements of anadromous brook char using wavelength-dispersive X-ray electron microscopy on individual circulii of sagittally sectioned scales. Body scales of brook char experimentally transferred between freshwater and seawater had elevated Sr/Ca ratios in regions laid down during exposure to seawater. Wild anadromous brook char body scales had consistently higher Sr/Ca ratios than river-resident form. However, in both experimental and wild brook char, Sr/Ca ratios in the scale circulii from freshwater periods showed elevated Sr/Ca ratios after seawater exposure, suggesting whole-scale Sr enrichment associated with exposure to seawater. Although whole-scale elemental composition revealed whether a fish has ever resided in a marine environment, analysis of Sr patterns at the level of individual circulii did not allow resolution of fine-scale patterns of these movements in brook char.

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.

Do brook charr (Salvelinus fontinalis) from insular Newfoundland have different parasites than their mainland counterparts?

1991 ◽  
Vol 69 (3) ◽  
pp. 809-811 ◽  
Author(s):  
David J. Marcogliese ◽  
David K. Cone
Keyword(s):  
North America ◽  
Parasite Species ◽  
Salvelinus Fontinalis ◽  
Salmonid Fishes ◽  
Primary Reason ◽  
Brook Charr ◽  
Northeastern North America ◽  
Metazoan Parasite ◽  
The Difference ◽  
Brook Char

Based on the published literature, comparison of the metazoan parasite faunas of brook char (Salvelinus fontinalis) from freshwater localities in northeastern North America reveals that hosts in insular Newfoundland have fewer parasite species recorded from them. Of 45 parasite species or taxa, only 20 are common to the island and the mainland. Twenty-three parasite species have been reported from the mainland but not from the island, with most of the taxa being types common to non-salmonid fishes. Two species, the copepod Ergasilus luciopercarum and the digenean Tetracotyle, have been reported from charr on the island but not from the northeastern mainland. It is suggested that the primary reason for the difference in the structure of the assemblages is the lack of contact brook charr in Newfoundland have with percid, cyprinid, centrarchid, esocid, and catostomid fishes and their parasites.

Effects of maternal stress and cortisol exposure at the egg stage on learning, boldness and neophobia in brook trout

Behaviour ◽  
2016 ◽  
Vol 153 (13-14) ◽  
pp. 1639-1663 ◽  
Author(s):  
Sergio Cortez Ghio ◽  
Antoine Boudreau Leblanc ◽  
Céline Audet ◽  
Nadia Aubin-Horth
Keyword(s):  
Spatial Learning ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Maternal Stress ◽  
Maternal Plasma ◽  
Spatial Learning And Memory ◽  
Maternal Factors ◽  
Species Specific ◽  
Brook Char ◽  
The Relationship

The environment experienced by females can have long-lasting effects on offspring phenotype. The objective of this study was to determine if maternal stress-induced behaviour reprogramming in offspring is found in brook char and to test whether cortisol is the main mediator, by separating the potential effects of cortisol from that of other potential maternal factors. We exposed female brook trout (Salvelinus fontinalis) to different parallel treatments during the oogenesis period: undisturbed as controls (1) fed cortisol through food (2) or physically stressed by handling once a week (3). Additionally, we exposed half of the control eggs to a cortisol suspension before fertilisation (4). Cortisol consumption and handling did not elevate either maternal plasma or egg cortisol, although egg cortisol level was significantly increased when eggs were bathed in the suspension. We measured spatial learning and memory, boldness and neophobia in 6 month-old offspring and found no effects of treatments on learning, memory or behaviour. Our results suggest that the relationship between maternal stress, circulating and egg cortisol levels, other maternal factors, and behavioural reprogramming is context and species-specific.

Sign in / Sign up

Export Citation Format

Share Document