Aquatic surveys and assessment of the Slim Buttes region of Harding and Butte Co., SD E7B0A490-9C23-4F66-8B12-C76B17101B65 Year: 2006 Figure 5. Channel depth measurement as part of the habitat and geomorphic assessments. Fish Communities Fish sampling protocols (MTFWP 2003) required the positioning of upstream and downstream block nets at the ends of the reach (300m or 40x wetted width), but most of the time shallow sections and/or riffle areas were sufficient to prevent fish from escaping while the run & pool areas were being seined from the upstream to the downstream direction with a 20-3
Aquatic surveys and assessment of the Slim Buttes region of Harding and Butte Co., SD E7B0A490-9C23-4F66-8B12-C76B17101B65 Year: 2006 Figure 5. Channel depth measurement as part of the habitat and geomorphic assessments. Fish Communities Fish sampling protocols (MTFWP 2003) required the positioning of upstream and downstream block nets at the ends of the reach (300m or 40x wetted width), but most of the time shallow sections and/or riffle areas were sufficient to prevent fish from escaping while the run & pool areas were being seined from the upstream to the downstream direction with a 20-30 ft Va inch straight seine, depending on wetted width (Figure 6). Fish were transferred to holding buckets, identified to species, enumerated in the field, examined for external anomalies ( deformities, eroded fins, lesions, and tumors), and then released (Figure 7). Young- of-the-year fish less than 20 millimeters in length were noted on the field sheet (not included in the totals), and released. Voucher specimens were only taken in the case of uncertain field identifications of the silvery minnows, Hybognathus spp., which were preserved in 10 buffered formalin and identified in the lab. Vouchers were submitted to the Montana State University fish collection. Figure 6. Fish sampling a run by seining with a 20 ft straight seine.
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