. The Canadian field-naturalist. CARILLON DAM (S) Upper river ""'^ (D Lower river C) Howltesbury ^ Seining site â Local paper mills GATINEAU -> L--^^-;y/^IAWATHA. PARK Figure L Ottawa River study area showing the gill and trap netting stations used from 1968 to 1973. Trap Netting Stations 1) Shirleys Bay 2) Hay Bay 3) Governor's Bay 4) Top of Upper Duck Island 5) Above Hawkesbury 6) Below Hawkesbury 7) Kettle Island Bay 8) Top of Lower Duck Island Gill Netting Locations A) Shirleys Bay F) New Edinburgh B) Britannia Bay Canoe Club C) Brewery Creek G) Above Gatineau D) Governor's Ba
. The Canadian field-naturalist. CARILLON DAM (S) Upper river ""'^ (D Lower river C) Howltesbury ^ Seining site â Local paper mills GATINEAU -> L--^^-;y/^IAWATHA. PARK Figure L Ottawa River study area showing the gill and trap netting stations used from 1968 to 1973. Trap Netting Stations 1) Shirleys Bay 2) Hay Bay 3) Governor's Bay 4) Top of Upper Duck Island 5) Above Hawkesbury 6) Below Hawkesbury 7) Kettle Island Bay 8) Top of Lower Duck Island Gill Netting Locations A) Shirleys Bay F) New Edinburgh B) Britannia Bay Canoe Club C) Brewery Creek G) Above Gatineau D) Governor's Bay H) Below Gatineau E) Mouth Gatineau River Hawkesbury about 140 km downstream of Ottawa. Lac Deschenes is a lake-like expanse of river char- acterized by gently sloping shorelines, slow currents and relatively good water quality (OWRC-QWB 1971). The lower river is a less homogeneous habitat with steep shorelines, moderate to fast currents and moderately polluted conditions. The water quality is not directly hazardous to fish and invertebrates except in certain localized areas below industrial and munic- ipal effluents (Stobo 1971; Mackie and Qadri 1973). The current and morphometry of the lower river allow the rapid oxygenation of much of the chemical and dissolved organic wastes entering the section. Wood- fiber from the two local paper mills (Figure 1) is widespread, but it is carried downstream before it can settle long enough to exert any significant influence on oxygen demand in the water column. Below Hawkes- bury, the Carillon Dam completed in 1964 (Munro 1967), has created a slow flowing environment which does not adequately assimilate the wastes from the. 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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