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Recruitment, growth and condition of a population of the white sucker, catostomus commersoni, in Lake 223, an experimentally acidified lake

Author: S M Chalanchuk; Canada. Department of Fisheries and Oceans. Western Region.
Publisher: Winnipeg : Western Region Dept. of Fisheries and Oceans, Sept. 1985.
Series: Canadian technical report of fisheries and aquatic sciences, 1396.
Edition/Format:   Print book : EnglishView all editions and formats
Summary:
A population of the white sucker, Catostomus commersoni, in Lake 223, in the Experimental Lakes Area, northwestern Ontario was studied from 1975 until 1983 to monitor the responses of the fish to experimental acidification of the lake. Recruitment failures occurred in 1981, 1982 and 1983 when the pH of the lake was between 5.0-5.2. Normal recruitment occurred in this lake in all other years from 1971-1980 when the  Read more...
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Additional Physical Format: Online version:
Chalanchuk, S. M.
Recruitment, growth and condition of a population of the white sucker, catostomus commersoni, in Lake 223, an experimentally acidified lake.
Winnipeg : Western Region Dept. of Fisheries and Oceans, Sept. 1985
(OCoLC)1142627538
Document Type: Book
All Authors / Contributors: S M Chalanchuk; Canada. Department of Fisheries and Oceans. Western Region.
OCLC Number: 70375277
Language Note: Includes abstract in French.
Description: iv, 18 pages : illustrations
Series Title: Canadian technical report of fisheries and aquatic sciences, 1396.
Responsibility: by S.M. Chalanchuk.

Abstract:

A population of the white sucker, Catostomus commersoni, in Lake 223, in the Experimental Lakes Area, northwestern Ontario was studied from 1975 until 1983 to monitor the responses of the fish to experimental acidification of the lake. Recruitment failures occurred in 1981, 1982 and 1983 when the pH of the lake was between 5.0-5.2. Normal recruitment occurred in this lake in all other years from 1971-1980 when the pH was between 5.6-6.5, and in other nonacidic lakes in this area during 1971-1983. Growth of fish aged two to six years increased as lake pH decreased from 6.5 to 5.5. Condition factors of all fish initially increased. These increases in growth and condition were made possible by increasing food supplies. By 1981-1982, when Lake 223's pH was 5.02, a decrease in food supply coincident with a peak in abundance of white suckers led to a decline in condition factors and a slight decline in growth of fish aged two to six years. Lowest condition factors "occurred in 1983.

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