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Alaska Department of Fish and Game


Alaska Fisheries Sonar

Kenai (RM 13.7) River
Sonar Tools

Sonar Tools

A new sonar technology called ARIS (for Adaptive Range Imaging Sonar) will be used at the RM 13.7 site. ARIS is essentially the "next generation" of DIDSON sonar but was renamed to reflect a number of advancements over the original DIDSON technology. Trials with the first ARIS systems in 2012 showed improved resolution and range capabilities. The software interface for ARIS has also been upgraded to allow faster review and processing of acoustic data.

The new ARIS technology was tested on the Kenai River in 2011 and 2012.
The new ARIS data processing software offers many new advanced features. Above, an echogram (at left) displays traces of migrating fish that can be displayed in video mode (at right) where fish images can be enlarged and measured.
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