Abstract
Use of Dual-Frequency Identification Sonar to Monitor Adult River Herring in a Small Coastal Stream
Highlights
The primary objective of this project was to assess the ability of dual-frequency identification sonar (DIDSON) to monitor migrating anadromous alewife Alosa pseudoharengus and blueback herring Alosa aestivalis in a small Massachusetts coastal stream
STUDY AREA AND TIMING The two study sites chosen were in the Herring River, which drains 24 km2 of eastern Cape Cod, Massachusetts (USGS Water Resources 2011), and has a population of river herring which return to spawn annually in the ponds that feed the river
Visual Species Identification and Fish Behavior River herring often hesitated to swim through the sampling area where the weirs and DIDSON were deployed
Summary
The primary objective of this project was to assess the ability of dual-frequency identification sonar (DIDSON) to monitor migrating anadromous alewife Alosa pseudoharengus and blueback herring Alosa aestivalis (collectively known as “river herring”) in a small Massachusetts coastal stream. The second study site was located above the level control dam and fishway structure at the outlet of Hinckleys Pond, approximately 10.5 river kilometers from Nantucket Sound (Figure 4). This site was selected to determine whether DIDSON could image upstream-migrating river herring as they exited the fishway into Hinckleys Pond. Monitoring at this site facilitated comparison with visual counts, as it was easy to visually count the fish passing into the lake through the concrete pond outlet
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