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Development of a Premier Northern River Fishery: Mesilinka River, The First Year of Fertilization (1994) Paul, A. J.
1996
A
D
Abstract: The addition of inorganic nutrients to increase fish production in the Mesilinka River, a northern interior river of British Columbia, is currently being investigated. Increased production of native fish stocks is desired to both offset negative impacts following the establishment of the Williston Reservoir and to meet increased angling demands for stream fisheries. In this report, we present the results from the first year of fertilization (1994) to the mainstem Mesilinka River, which has a mean annual discharge of 181, 108 and 49 cubic metres/sec in June, July and August, respectively. Three reaches on the Mesilinka River (an upstream control reach, Blackpine, and two downstream treatment reaches, T1 and T2) and an additional external reference system (the Nation River) were established to test the effects of added nutrients to stream production. Inorganic fertilizer was added above T1 as ammonium polyphosphate, 10-34-0, and urea-ammonium nitrate, 28-0-0. Another fertilizer station downstream of T1, but above T2, added only ammonium polyphosphate. Due to clogging of the fertilizer drip valves, actual loading rates of nitrogen (N) and phosphorus (P) were lower than target loadings of 15 ug N per litre and 5 ug P per litre. Mean summer loadings of N and P at the upper fertilizer station were 9.0 ug N per Litre and 4.5 ug P per litre, and at the lower station (10-34-0 only) were 2.4 ug N per litre and 3.6 ug P per litre. Rapid uptake of added P was evident by the low concentrations (below detection limits) of soluble reactive phosphorus (SRP) several kilometres downstream from the fertilizer stations. However, during brief periods when SRP increased above detectable limits in the Mesilinka River, it was greatest in the two treatment reaches. Fertilizer additions likely drove algal production from P limitation to N limitation, especially in T2, as indicated by the rapid decline in dissolved inorganic N following the start of fertilization. Despite lower ...
 
Paul, A. J., Koning, C. W.; Ashley K. I.; Slaney, P. A.; Davidson, P. W.: Land, R. W.. 1996. Development of a Premier Northern River Fishery: Mesilinka River, The First Year of Fertilization (1994). Ministry of Environment, Lands and Parks. Fisheries Project Report. RD 50
 
Topic: Conservation + Mgmt (Wildlife, Fish, Plant)
Keywords: fishery, river, fertilization, experimental
ISSN:  Scientific Name: Salvelinus confluentus, Thymallus arcticus pop. 1, Oncorhynchus mykiss
ISBN:  English Name: Arctic Grayling (Williston Watershed Population), Rainbow Trout, Bull Trout
Other Identifier: FPR RD 50
 
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