Case Studies

Case Study: Processing data from acoustic cameras to evaluate fish behavior in and around Cougar Dam, Oregon

The passage of free-ranging juvenile Chinook salmon (Oncorhynchus tshawytscha) was monitored at the Cougar Dam near Springfield (Oregon) using acoustics cameras (DIDSON imaging sonar), and the data processed using Echoview to measure fish travel speed and direction adjacent to the water temperature control tower during the spring and fall of 2013. The much larger size of juvenile salmon allowed scientists from the USGS Western Fisheries Research Center to discriminate these from their known predators in areas adjacent to the tower entrance.

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Case study: Examining the fine scale biology of animals in the mesopelagic zone using an AUV

An Autonomous Underwater Vehicle (AUV) was deployed deep in the ocean canyons of California’s Channel Islands by Dr Kelly Benoit-Bird to locate how and where beaked whales and sperm whales hunt for squid. The AUV was fitted with multi-frequency echosounders, computers and navigational equipment, and the real-time data was processed underway using an Echoview feed to the vessel’s navigational system.

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Case study: Species identification in the Black Sea using multifrequency echosounder data

Drs Serdar Sakinan and Ali Cemal Gücü (Middle East Technical University,Turkey) studied the ecology of the Black Sea copepod Calanus euxinus, and were able to apply two different multi-frequency classification techniques in Echoview to separate the copepod from other organisms in their echosounder data. These techniques allowed the researchers to discriminate copepods from fishes, thus enabling them to examine their distribution in relation to environmental variables such as dissolved oxygen and temperature.

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