Citation | Madrone Environmental Services Ltd. 2015. Somenos basin coho salmon summer habitat assessment. Prepared for Somenos Marsh Wildlife Society. |
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Organization | Somenos Marsh Wildlife Society |
URL | http://somenosmarsh.com/files/7014/2385/3376/Somenos_Basin_Coho_Salmon_Habitat_Assessment.pdf |
Abstract/Description or Keywords | During the summer of 2014, we investigated the summer distribution and movements of juvenile Coho Salmon (Oncorhynchus kisutch), Steelhead (Oncorhynchus mykiss), and Cutthroat Trout (Oncorhynchus clarkii) in the Somenos basin and monitored temperature and other environmental variables to assess habitat suitability. We found that juvenile salmonids were absent from Somenos Lake by at least July and did not appear to have returned to the lake by the end of sampling in early November. Temperature was monitored by data loggers located in Somenos Lake and its three tributaries: Bings Creek, Averill Creek, and Richards Creek. Somenos Lake was also monitored daily by a team of volunteers who collected data on temperature, water clarity, dissolved oxygen and atmospheric conditions at a lakeside station. The Surface temperature of Somenos Lake was higher than 21ºC from the beginning of monitoring in July to the middle of September. Only Pumpkinseed Sunfish (Lepomis gibbosus) and Threespine Stickleback (Gasterosteus aculeatus) were found in Somenos Lake during trapping in October and November. Tributary temperatures never exceeded 18ºC throughout the monitoring period. Although temperatures in Richards Creek were suitable for juvenile salmonids, none were observed during trapping events. During trapping in early October, Juvenile Coho Salmon were caught in Averill Creek and Bings Creek and Cutthroat Trout in Bings Creek. |
Information Type | report |
Regional Watershed | Vancouver Island South |
Sub-watershed if known | Cowichan, Somenos |
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Project status | complete |
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