Energetic Constraints and Spawning Interval in the Anadromous Arctic Charr (Salvelinus alpinus)

Copeia ◽  
1986 ◽  
Vol 1986 (4) ◽  
pp. 945 ◽  
Author(s):  
J.-D. Dutil
Keyword(s):  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Anadromous Arctic Charr ◽  
Energetic Constraints

PCB disruption of the hypothalamus-pituitary-interrenal axis involves brain glucocorticoid receptor downregulation in anadromous Arctic charr

2004 ◽  
Vol 287 (4) ◽  
pp. R787-R793 ◽  
Author(s):  
Neelakanteswar Aluru ◽  
Even H. Jorgensen ◽  
Alec G. Maule ◽  
Mathilakath M. Vijayan
Keyword(s):  
Glucocorticoid Receptor ◽  
Plasma Cortisol ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Production Capacity ◽  
Heat Shock Protein 90 ◽  
Aroclor 1254 ◽  
Anadromous Arctic Charr ◽  
Cortisol Levels

We examined whether brain glucocorticoid receptor (GR) modulation by polychlorinated biphenyls (PCBs) was involved in the abnormal cortisol response to stress seen in anadromous Arctic charr ( Salvelinus alpinus). Fish treated with Aroclor 1254 (0, 1, 10, and 100 mg/kg body mass) were maintained for 5 mo without feeding in the winter to mimic their seasonal fasting cycle, whereas a fed group with 0 and 100 mg/kg Aroclor was maintained for comparison. Fasting elevated plasma cortisol levels and brain GR content but depressed heat shock protein 90 (hsp90) and interrenal cortisol production capacity. Exposure of fasted fish to Aroclor 1254 resulted in a dose-dependent increase in brain total PCB content. This accumulation in fish with high PCB dose was threefold higher in fasted fish compared with fed fish. PCBs depressed plasma cortisol levels but did not affect in vitro interrenal cortisol production capacity in fasted charr. At high PCB dose, the brain GR content was significantly lower in the fasted fish and this corresponded with a lower brain hsp70 and hsp90 content. The elevation of plasma cortisol levels and upregulation of brain GR content may be an important adaptation to extended fasting in anadromous Arctic charr, and this response was disrupted by PCBs. Taken together, the hypothalamus-pituitary-interrenal axis is a target for PCB impact during winter emaciation in anadromous Arctic charr.

Winter condition and proximate composition of anadromous arctic charr (Salvelinus alpinus) in eastern Ungava Bay, Quebec

1990 ◽  
Vol 68 (11) ◽  
pp. 2284-2289 ◽  
Author(s):  
Thomas G. Boivin ◽  
G. Power
Keyword(s):  
Proximate Composition ◽  
Condition Factor ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Liver Lipid ◽  
Composition Analysis ◽  
Liver Protein ◽  
Muscle Lipid ◽  
Winter Condition ◽  
Anadromous Arctic Charr

Arctic charr (Salvelinus alpinus) were sampled during the winter of 1985–1986 in the Kangiqsualujjuaq area of northern Quebec to examine feeding patterns and temporal variation in condition. No feeding was observed at any time during the winter, and examination of gallbladder coloration indicated that feeding had not occurred for a long period of time. Proximate composition analysis of nonreproductive charr from Koroc River indicated that liver and muscle lipid and liver protein reserves changed during the winter fast, and this was most pronounced in early winter. Spent charr sampled at Lake Tasikallak had lower liver lipid and condition factor values and were more depleted than nonreproductive charr. Despite a reduction in lipids and protein during winter, the general condition of nonreproductive charr renders them suitable for commercial sale at any time of the year.

Metazoan parasite infections in landlocked and anadromous Arctic charr (Salvelinus alpinus Linnaeus), and their use as indicators of movement to sea in young anadromous charr

1989 ◽  
Vol 67 (10) ◽  
pp. 2478-2485 ◽  
Author(s):  
Daniel R. Bouillon ◽  
J. Brian Dempson
Keyword(s):  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Salt Water ◽  
The Arctic ◽  
Regression Analyses ◽  
Metazoan Parasites ◽  
Diphyllobothrium Dendriticum ◽  
Anadromous Arctic Charr ◽  
Seaward Migration ◽  
Parasite Infections

Eighteen genera of metazoan parasites (Monogenea, 1; Digenea, 7; Cestoda, 4; Nematoda, 4; Acanthocephala, 1; Copepoda, 1) were collected from 172 landlocked and anadromous Arctic charr (Salvelinus alpinus Linnaeus) in northern Labrador. Four species (Lecithaster gibbosus, Diphyllobothrium dendriticum, Diphyllobothrium ditremum, and Salmincola carpionis) and one genus (Tetraonchus) have not previously been reported from Arctic charr in Labrador. The dominant parasites in the landlocked charr were Diplostomum sp., Crepidostomum farionis, and Diphyllobothrium ditremum. In the sea-run charr, Bothrimonus sturionis and Brachyphallus crenatus were dominant. Regression analyses indicated that the numbers of parasites were significantly correlated with host age (P < 0.001) for these species. All landlocked charr sampled were infected with parasites by age 1+ years whereas all sea-run charr were infected by age 3+. At 1+ years, 43% of the Arctic charr collected in the Ikarut River were infected with marine or brackish-water parasites, suggesting that some young charr, not yet ready for the annual seaward migration, may make short feeding excursions into salt water.

Habitat preferences and residence time for the freshwater to ocean transition stage in Arctic charr

1999 ◽  
Vol 79 (1) ◽  
pp. 153-160 ◽  
Author(s):  
M.L. Bégout Anras ◽  
E.C. Gyselman ◽  
J.K. Jorgenson ◽  
A.H. Kristofferson ◽  
L. Anras
Keyword(s):  
Sea Ice ◽  
Residence Time ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Habitat Preferences ◽  
Open Water ◽  
Measured Temperature ◽  
Transition Stage ◽  
Anadromous Arctic Charr ◽  
In The Wild

Using acoustic telemetry techniques, the movements and habitat utilization of anadromous Arctic charr (Salvelinus alpinus) were determined when they entered the Freshwater Creek Estuary (Cambridge Bay, Northwest Territories, Canada) in the spring. The study was carried out during the transition from full ice cover to open water.Between 23 June and 1 July 1996, nine adult Arctic charr were tagged with external acoustic transmitters. These fish were tracked until 6 July using two radio-linked acoustic array systems and a portable manual receiver with a directional hydrophone. Two transmitters measured temperature and location, one measured depth and location and the remaining six, location only.All of the tagged charr remained in Cambridge Bay Estuary until the sea-ice had melted and the mouth of the bay was ice-free. Primarily, they remained in the warmer brackish surface layer which was ∼2 m thick and rarely moved into the colder underlying marine waters. As well, the tagged charr remained either near the shore or over offshore shoals, following the ice-edge as it melted down the estuary. Residence time in the estuary was greater than ten days for some fish. Therefore, in spite of evidence from controlled laboratory studies that have shown that Arctic charr are preadapted to the marine environment and are capable of migrating directly into seawater, this study shows that, in the wild, they prefer to remain in warmer brackish water until the sea-ice has melted and that the transition stage is longer than previously suggested.

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