Mercury Concentrations in Arctic Food Fishes Reflect the Presence of Anadromous Arctic Charr (Salvelinus alpinus), Species, and Life History

2010 ◽  
Vol 44 (9) ◽  
pp. 3286-3292 ◽  
Author(s):  
Heidi K. Swanson ◽  
Karen A. Kidd
Keyword(s):  
Life History ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Anadromous Arctic Charr

Life history of anadromous arctic charr, Salvelinus alpinus, in the Fraser River, northern Labrador

1985 ◽  
Vol 63 (2) ◽  
pp. 315-324 ◽  
Author(s):  
J. B. Dempson ◽  
J. M. Green
Keyword(s):  
Life History ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Fork Length ◽  
Fraser River ◽  
Large Variability ◽  
Anadromous Arctic Charr ◽  
North American Arctic ◽  
History Of ◽  
Length Variable

Upstream migrations of anadromous Arctic charr, Salvelinus alpinus, were monitored in the Fraser River, Labrador. Samples of charr were randomly obtained from 1975 to 1979 for biological analysis of age, growth, reproductive, and migratory characteristics. The run begins in mid-July and extends until late September. Larger charr tend to enter the river first with a progressive decrease in mean length throughout the run. Size and age composition of migrant charr range from 13 to 82 cm ([Formula: see text], 45.1 ± 7.3) and from 3 to 18 years (8.3 ± 1.7), respectively. Spawning activity peaks during the last 2 weeks in October. Fecundity of fish 41–61 cm in fork length ranged from 2316 to 9245 eggs (4665 ± 434) with approximately 75% of females mature by 8 years of age. There was no evidence from tag recaptures over an 8-year period (1976–1983; N = 241) that Fraser River charr undergo extensive marine migrations. Approximately 84% of the recaptures were from fish which either returned to the Fraser River or were caught in commercial and domestic fisheries in adjacent Nain and Tikkoatokak bays. In comparison with other North American Arctic charr populations, Fraser River charr are similar with respect to the large variability observed in age at length, variable maturation cycle, and preponderance of females at sea during the summer. Differences, however, occur among individual life history characteristics such as growth rate, size and age at first seaward migration, size and age at maturity, fecundity, and movements at sea.

Migration and life history variation in Arctic charr,Salvelinus alpinus

Ecoscience ◽  
1996 ◽  
Vol 3 (1) ◽  
pp. 33-41 ◽  
Author(s):  
Ross F. Tallman ◽  
Fernand Saurette ◽  
Trevor Thera
Keyword(s):  
Life History ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Life History Variation

scholarly journals Environmentally Modulated Repeat Evolution of Polymorphic Arctic Charr Life History Traits

2021 ◽  
Vol 9 ◽  
Author(s):  
Gabrielle Grenier ◽  
Aslak Smalås ◽  
Runar Kjær ◽  
Rune Knudsen
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Growth Parameters ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Local Environment ◽  
Life History Strategies ◽  
Age At Maturity ◽  
First Time ◽  
Sympatric Morphs

Sympatric Arctic charr, Salvelinus alpinus (L. 1758), morphs have flexible but repeated life history strategies tested across five Norwegian lakes. In several Scandinavian polymorphic Arctic charr populations differentiated by their diet and habitat use, a large littoral omnivorous (LO) morph commonly cooccurs with a smaller profundal spawning (PB/PZ) morph. A third, large piscivorous (PP) morph is also known to occur within a portion of Arctic charr populations in the profundal habitat along with the PB/PZ individuals. Life history traits, such as age at maturity, growth, and diet are known to differ among coexisting morphs. Notably, the PP morph was the longest morph with the oldest age at maturity while the PB/PZ morph showed the shortest lengths overall and youngest age with LO morph being intermediate in both traits. Growth parameters differed across all the morphs. When examining growth within morph groups, the LO morph was found to have different growth across all lakes, while similar reproductive investments and different energy acquisition patterns were seen within the PB/PZ and PP morphs. These results suggest repeat evolution in several life history strategies of reproductively isolated Arctic charr sympatric morphs, notably for the first time in the PP morph, while also highlighting the importance of the local environment in modulating life history traits.

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.

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