. The Canadian field-naturalist. 1989 Notes 431. Figure 2. The outmigration of underyearling Northern Pike from the Saskeram Marshes in 1983 and 1984, as indindicated by mean catches at Bracken Dam per 5-day periods. 1983, were below mgL/1 and there was a detectable sulphide odour in the water. In 1984, the outmigration ceased abruptly after mid- November. By 13 November, the Saskeram Marshes had frozen over and water leaving the marshes had a noticeable sulphide odour. Dissolved oxygen levels in surface water above Bracken Dam dropped to less than mgL"1 by 17 November. The above,
. The Canadian field-naturalist. 1989 Notes 431. Figure 2. The outmigration of underyearling Northern Pike from the Saskeram Marshes in 1983 and 1984, as indindicated by mean catches at Bracken Dam per 5-day periods. 1983, were below mgL/1 and there was a detectable sulphide odour in the water. In 1984, the outmigration ceased abruptly after mid- November. By 13 November, the Saskeram Marshes had frozen over and water leaving the marshes had a noticeable sulphide odour. Dissolved oxygen levels in surface water above Bracken Dam dropped to less than mgL"1 by 17 November. The above, along with other information, was considered in providing Ducks Unlimited with recommendations on water level management in the Saskeram Marshes (Derksen and Gillies 1985). These recommendations were aimed at enhancing pike production from the Saskeram Marshes and reducing the severity of winterkills. Acknowledgments I thank H. Schell who drafted the figures in this report. Literature Cited Derksen, A. J., and D. G. Gillies. 1985. The seasonal utilization of the Saskeram Marshes by fish populations and its significance to the fisheries resources of the Saskatchewan River Delta in Manitoba, with special reference to northern pike. Manitoba Department of Natural Resources, Fisheries Branch, MS Report 85-10. 337 pages. Fago, D. M. 1977. Northern pike production in managed spawning and rearing marshes. Wisconsin Department of Natural Resources, Technical Bulletin No. 96. 30 pages. Received 15 February 1988 Accepted 17 April 1989. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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