Inshore acoustic surveys in the eastern and central Gulf of Alaska

A series of daytime replicate (spring/summer/fall) acoustic surveys were conducted at 11 inshore sites along the Kodiak Island/Kenai Peninsula area and the outer coast of Southeast Alaska as part of the Gulf of Alaska Integrated Ecosystem Research Program in 2010, 2011, and 2013. A two-frequency technique was used to classify backscatter as ‘fish’ or’macrozooplankton’ based on the observed relative frequency response, which are used as proxies...