The Adam River, located on Vancouver Island, British Columbia, was fertilized to examine the feasibility of low-level fertilization as a method of increasing resident fish (native rainbow and introduced brown trout) populations in an oligotrophic river. A pre-fertilization assessment was conducted in 1992-93 with liquid phosphorus- and nitrogen-based fertilizers added during the summers of 1994-97 to meet a target instream concentration of 5µg-PL^-1d 8.4 µg-NL^-1. Each summer, field measurements of water flow, temperature, nutrient concentrations, chlorophyll a accrual, invertebrate biomass and taxonomy, and fish abundance, size and age distribution took place in a treatment reach (T2), and two upstream control reach reaches (control and T1). June to September water temperatures averaged 14ºC with monthly average flows decreasing from 11 to 2 m3/sec, respectively. Water chemistry analyses indicated there was no increase in nutrient concentrations within the fertilized reach, and chlorophyll a biomass accru
Wilson, Gregory, Ashley, Ken; Ewing, Sarah Mouldey; Slaney, Pat; Land, Robert W.. 1999. Development of a Resident Trout Fishery on the Adam River Through Increased Habitat Productivity: Final Report of the 1992–97 Project. Ministry of Fisheries. Fisheries Project Report. RD 68
Topic: Fish and Fish Habitats
Keywords: trout, fishery, density, Adam River, Rooney Creek, Newcastle Creek, Vancouver Island, habitat, productivity, fertilization
Other Identifier: FPR RD 68, FPRRD68, RD68
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