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Population indices of brook trout (Salvelinus fontinalis), Atlantic salmon (Salmo salar) and salmonid competitors in relation to summer water temperature and habitat parameters in 100 streams in Nova Scotia Preview this item
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Population indices of brook trout (Salvelinus fontinalis), Atlantic salmon (Salmo salar) and salmonid competitors in relation to summer water temperature and habitat parameters in 100 streams in Nova Scotia

Author: John L MacMillan; Canada. Diadromous Fish Section.
Publisher: Moncton, N.B. : Fisheries and Oceans Canada, 2008.
Series: Canadian technical report of fisheries and aquatic sciences (Online), 2819.
Edition/Format:   eBook : Document : National government publication : EnglishView all editions and formats
Summary:
Many Nova Scotia streams warm to stressful levels for brook trout (Salvelinus fontinalis) and Atlantic salmon (Salmo salar) in summer. A total of 100 streams were classified into three categories based on the mean summer water temperature and known thermal preferences for brook trout. Mean summer water temperatures were <16.5°C for cool streams, between 16.4 and 19°C for intermediate streams, and>18.9°C for  Read more...
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Details

Material Type: Document, Government publication, National government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: John L MacMillan; Canada. Diadromous Fish Section.
OCLC Number: 316665226
Language Note: Includes abstract in French.
Notes: Distributed by the Government of Canada Depository Services Program.
Description: 1 online resource.
Series Title: Canadian technical report of fisheries and aquatic sciences (Online), 2819.
Responsibility: J.L. MacMillan [and others].

Abstract:

Many Nova Scotia streams warm to stressful levels for brook trout (Salvelinus fontinalis) and Atlantic salmon (Salmo salar) in summer. A total of 100 streams were classified into three categories based on the mean summer water temperature and known thermal preferences for brook trout. Mean summer water temperatures were <16.5°C for cool streams, between 16.4 and 19°C for intermediate streams, and>18.9°C for warm streams. Studied streams were electrofished to determine potential influences of thermal conditions on salmonids during the summer. Juvenile salmon population densities ranged from zero to 65 fish/100m² and were not greatly influenced by water temperature. Brook trout population densities ranged from zero to 332 fish/100m² and were strongly influenced by mean summer water temperature. Notably, the mean population density of brook trout was 58 fish/100m² in 33 cool water streams, 14 fish/100m² in 33 intermediate streams, and 2 fish/100m² in 34 warm water streams. Stream habitat parameters including habitat type, substrate, cover, and water depth were not correlated with salmonid densities. However, warm water streams were wider, more acidic, and less conductive compared to cool water streams. Non-salmonid species sampled that were considered to be competitors on trout included: yellow perch (Perca flavescens), smallmouth bass (Micropterus dolomieu), chain pickerel (Esox niger), American eel (Anquilla rostrata), white sucker (Catostomus commersoni), brown bullhead (Ameiurus nebulosus). One or more competitor species were present in 39% of cool water streams, 64% of intermediate streams, and 85% of warm water streams. Regional differences in water quality parameters are related to surficial geology. Most cool water streams were circumneutral (6 <pH <8), conductive, inhabited by few fish species, and important summer habitat for brook trout. The thermal nature of rivers is an important consideration in the development of management strategies to improve and sustain the trout fishery in Nova Scotia.

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