Exploratory surveys and directed studies of Rocky Mountain ridged mussel (Gonidea angulata Lea, 1839) in British Columbia / by L. Stanton, R. Lauzier, S. MacConnachie, L. Nield, S. Pollard, J. Heron, and...: Fs97-4/3003E-PDF

"Exploratory surveys completed collaboratively by Fisheries and Oceans Canada, the British Columbia Ministry of Environment and the British Columbia Ministry of Forests, Lands and Natural Resource Operations from 2008-2011 verified the current distribution of Gonidea angulata in British Columbia. Live mussels were only observed in the Okanagan River Basin with five main aggregations identified in Okanagan Lake. Quantitative surveys conducted at Dog Beach, Summerland on Okanagan Lake estimated a current population of 4,000 individuals, likely representing the largest population of G. angulata in Canada and a potential site for future long term monitoring. Overwintering and density by depth surveys identified the proportion of mussels within the shallow littoral zone at risk of desiccation and increased predation. Results of these surveys will be incorporated into the Okanagan Fish and Water Management Tools System. Preliminary life history studies revealed mature glochidia are released within conglutinates at water temperatures above 15°C in early June and provides initial correlative information on fish species present in the area during glochidial release that may potentially serve as hosts including: Prickly Sculpin (Cottus asper), suckers (Catostomus spp.), Northern Pikeminnow (Ptychocheilus oregonensis) and Redside Shiner (Richardsonius balteatus)"--Abstract, page vii.

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