An Information Summary on Arctic Grayling from the Williston Reservoir Watershed with Data Gap Analysis and Recommendations PDF Download
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Languages : en
Pages : 39
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Book Description
This publication summarizes information on Arctic grayling in the Williston Reservoir watershed of British Columbia. It begins with a chronological outline of Arctic grayling research in the watershed including inventories, stream fertilization, habitat enhancement, stocking, life history & genetic studies, and radio tracking. It then provides a synthesis in outline form of Arctic grayling data from Williston watershed projects & from the published literature under the following headings: reproduction, early rearing, habitat utilization, migrations, food, age & growth, and genetics. This is followed by discussion of the potential factors that limit the Arctic grayling population in the Reservoir, such as food & habitat availability, predation, egg & fry mortalities, competition, and overfishing. Finally, recommendations are made to prevent further declines in the Arctic grayling population, enhance or restore production from existing populations, and determine if & how stocks can be reintroduced into historical habitats.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
This publication summarizes information on Arctic grayling in the Williston Reservoir watershed of British Columbia. It begins with a chronological outline of Arctic grayling research in the watershed including inventories, stream fertilization, habitat enhancement, stocking, life history & genetic studies, and radio tracking. It then provides a synthesis in outline form of Arctic grayling data from Williston watershed projects & from the published literature under the following headings: reproduction, early rearing, habitat utilization, migrations, food, age & growth, and genetics. This is followed by discussion of the potential factors that limit the Arctic grayling population in the Reservoir, such as food & habitat availability, predation, egg & fry mortalities, competition, and overfishing. Finally, recommendations are made to prevent further declines in the Arctic grayling population, enhance or restore production from existing populations, and determine if & how stocks can be reintroduced into historical habitats.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
Arctic grayling were abundant in the upper Peace, Finlay, & Parsnip watersheds of British Columbia before construction of the Bennett Dam and flooding of the Williston Reservoir in 1968. Arctic grayling populations in the Reservoir started to decline in the 1980s and by 1988 most populations in the Reservoir & smaller streams flowing directly into the reservoir had severely declined or disappeared. This document presents a plan that intends to provide a co-ordinated approach to preserve & restore Arctic grayling populations and their habitat within the Williston watershed. The introduction reviews the biology of this species and the possible reasons for the decline in its population. Plan activities are then listed under four strategic objectives: understanding Arctic grayling biology; develop watershed-specific management strategies to conserve & restore native stocks; protect, restore, & manage Arctic grayling habitat; and inform & educate the public. A work plan & time lines are also included.
Author: Murray Lashmar
Publisher:
ISBN: 9780772677051
Category : Arctic grayling
Languages : en
Pages : 5
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Book Description
Author: Northcote, T. G
Publisher: Province of British Columbia, Ministry of Environment, Lands and Parks, Fisheries Branch
ISBN: 9780772621207
Category : Arctic grayling
Languages : en
Pages : 69
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Book Description
Author: Mike Stamford
Publisher:
ISBN:
Category : Arctic grayling
Languages : en
Pages : 136
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Book Description
Author: Sarah C. F. Hawkshaw
Publisher:
ISBN:
Category : Arctic grayling
Languages : en
Pages : 0
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Book Description
"The habitat requirements of juvenile Arctic grayling (Thymallus arcticus) were assessed in the Williston watershed, British Columbia, where the population is currently red-listed (critically imperiled). Temperature preferences of juvenile Arctic grayling was assessed behaviorally using a shuttlebox system, and an information theoretic approach analysis of logistic regression models was used to evaluate the influence of environmental factors on the distribution of juvenile Arctic grayling throughout the Williston watershed. Temperature preference of juvenile Arctic grayling did not vary between the two tributaries in the watershed (p = 0.77) and the average preferred temperature was 16.84 ± 0.66 °C (n = 28). Comparisons of the preferred temperature to ambient water temperatures suggested that juvenile Arctic grayling will avoid areas where maximum water temperature is above the preferred temperature. There was a positive association between juvenile Arctic grayling occurrence and stream order (SO) and stream order multiplied by distance from the Williston reservoir (SDRxSO), as well as a negative association with the mean daily water temperature variance (varT) and average water temperature (aveT). Overall these findings suggest that large river systems are important juvenile Arctic grayling habitat and management decision should be made to ensure protection of this habitat throughout the range of this species."--P. ii.
Author:
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ISBN:
Category :
Languages : en
Pages : 15
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Book Description
This report describes & presents results of a field program carried out in 2000 on rivers in the Williston Reservoir watershed of British Columbia to gather information on Arctic grayling. The program included beach seine sampling of grayling juveniles along the Parsnip River and underwater counts at index sites along the Table & Anzac rivers to obtain estimates of grayling adults. Results related to the distribution & relative abundance of Arctic grayling are compared to those of a similar program conducted in 1998.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 45
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Book Description
As part of ongoing investigations to determine the status of Arctic grayling in the Williston watershed in northern British Columbia, a large tributary stream of the Williston Reservoir was examined to determine Arctic grayling distribution, relative abundance, and habitat use. This report presents findings of electrofishing surveys that looked for the presence of Arctic grayling in the Ingenika River watershed. Observations of grayling fry habitat use are compared to studies conducted on other rivers in the Williston watershed. Results are also presented from angling surveys that collected information on adult grayling distribution.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
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Book Description
This report concerns part of a program to conserve & restore Arctic grayling stocks & habitat in the Williston watershed of British Columbia. It describes a study conducted to determine migratory patterns, overwinter distribution & habitat, and spawning areas & habitats of Arctic grayling in the Table & Anzac rivers, both tributaries of the Parsnip River. In the study, 55 grayling were captured, surgically implanted with radio transmitters, and released back into the Table & Anzac rivers. The fish were tracked by aerial radio telemetry on a monthly basis during the winter of 1996-97 to identify overwinter locations and on a biweekly basis in April once migrations had started. Tracking flight frequency was increased to weekly during the suspected spawning period (May & June) and then monthly until October. In addition, underwater surveys were conducted in September to verify conditions of tagged fish. Results are presented & discussed regarding survival rates; migrations to overwintering, spawning, & summer feeding areas; and spawning area characteristics. The final section discusses management implications based on the findings.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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Book Description
As part of ongoing investigations to determine the status of Arctic grayling in the Williston watershed in northern British Columbia, two large tributary streams of the Williston Reservoir were examined to determine Arctic grayling distribution, relative abundance, and habitat use. This report presents findings of electrofishing surveys that looked for the presence of Arctic grayling in the Omineca and Osilinka rivers. Observations of grayling fry habitat use are compared to studies conducted on the Table & Anzac rivers in the Parsnip River drainage of the Williston watershed. Results are also presented from angling surveys that collected information on adult grayling distribution.
