This report reviews the fourth year (1995) of a planned five year project (i.e., 1992-1996) involving the experimental fertilization of the North Arm of Kootenay Lake. This experiment remains one of the largest and most ambitious projects ever undertaken by the Ministry of Environment, Lands and Parks (MoELP), and next to Chilko Lake, B.C. (20,032 ha), the North Arm of Kootenay Lake (17,363 ha) is the second largest lake to have undergone experimental fertilization world-wide. Previous progress reports (Ashley and Thompson, 1993; Ashley et al., 1994) had reported the North Arm surface area as 13,000 ha, however, a recent digitization (Compugrid Version 7 program) of the Canadian Hydrographic Service map of Kootenay Lake (CHS chart 3050, 1986 edition) indicates the revised North Arm surface area is 17,363 ha, the South Arm surface area is 22,174 ha and the whole lake is 39,537 ha. The corrected surface areas were incorporated in the third year (1994) progress report (Ashley et al., 1996). The purpose of this progress report is to provide a preliminary analysis of the various field and laboratory data collected at Kootenay Lake in 1995, which was the fourth consecutive year of North Arm experimental fertilization.
The philosophy of the Kootenay Lake fertilization experiment is that it is clearly an experiment, and there is a potential risk of failure or non-achievement of the desired goal(s). The adaptive environmental assessment (ABA) workshop process was used initially to define the extent and magnitude of the problem(s) and develop alternative management policy options that were amenable to experimentation (Walters et al., 1991). Following funding approval and public acceptance of the experimental fertilization proposal, the adaptive management approach was adopted (Walters, 1986) in which the management policy selected (i.e., fertilization) was monitored in sufficient detail such that appropriate modifications could be taken if necessary.
Ashley, Ken, Thompson, Lisa C.; Warburton, Peter; Yang, Ying-Rong; Pick, Frances R.; Hamilton, Paul B.; Lasenby, David C.; Smokorowski, Karen E.; McEachern, Laurie; Sebastian, Dale; Scholten, George. 1997. Kootenay Lake Fertilization Experiment - Year 4 (1995/96) Report. BC Ministry of Environment, Lands and Parks. Fisheries Project Report. RD 58