The second year of low-level inorganic fertilization of the Adam River, on Vancouver Island, was carried out between June and September, 1995, with the addition of 1,600 L of liquid ammonium polyphosphate (10-34-0; N-P2O5-K2O) and 700 L of urea-ammonia nitrate (28-0-0: N-P2O5-K2O) fertilizer. This is being done as part of a 6 year experiment to examine the feasibility of low-level inorganic fertilization as a method of creating a quality resident rainbow and brown trout fishery in an oligotrophic river. Consistent with the pre-fertilization assessment in 1992-93, and the first year of fertilization in 1994, field measurements of water flow, temperature, nutrient concentration, chlorophyll A accrual, benthic invertebrate biomass, and fish abundance, growth, and age distribution took place throughout the river in the 1995 growing season. The data, gathered over several years of fertilization, will provide insight into the value of low-level nutrient additions as a fisheries rehabilitation technique, while benefiting existing populations of salmonids. In this report, the results of the second season of nutrient addition (1995) are presented.
In addition, 109.1 kg of solid slow release fertilizer briquettes (7-40-0; MgNH4-PO4-H2O) were placed in Newcastle Creek, and 27.3 kg in Rooney Creek, both tributaries of the Adam River, to assess the effects of this type of nutrient application on small stream habitat restoration. Some preliminary results from this application are also presented.
Toth, Brian, Ashley, Ken; Wilson, Gregory; Koning, C. Wendell; Slaney, Pat; Rimmer, Dave; Land, Robert. 1997. Development of a Resident Trout Fishery on the Adam River Through Increased Habitat Productivity: Year Two (1995) of Low-Level Inorganic Nutrient Addition. BC Ministry of Environment, Lands and Parks. Fisheries Project Report. No. RD 57