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Acoustic identification of isada krill, Euphausia pacifica Hansen, off the Sanriku coast, north-eastern Japan

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In this study, the feasibility of identification and abundance estimation of isada krill, Euphausia pacifica, was examined using a two-frequency (38 and 120 kHz) method. The acoustic survey and midwater trawling were conducted off the Sanriku coast, northern part of Honshu, Japan. In one pattern, the SV difference between the two frequencies was large, and in the other, the SV difference was small. These results were interpreted by scattering models, and showed that discrimination between isada krill and walleye pollock was possible.
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Keywords: SV difference; acoustic identification; frequency characteristic; isada krill; two-step integration method

Document Type: Original Article

Affiliations: 1: Japan Marine Fishery Resources Center, Chiyoda, Tokyo 102, Japan, 2: Department of Aquatic Bioscience, University of Tokyo, Yayoi, Tokyo 113, Japan, 3: Kaijo Corporation, Hamura-shi, Tokyo 205, Japan, 4: Tohoku National Fisheries Research Institute, Shiogama-shi, Miyagi 985, Japan

Publication date: 1998-02-01

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