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- W1969590943 abstract "Acoustic observations to describe small-scale spatial patterns or aggregations of fish have traditionally been made in two dimensions using vertical echosounders. Recently, multibeam sonars have been utilized as a tool to study the three-dimensional structure of fish aggregations. This study describes small-scale spatial patterns of juvenile walleye pollock, Theragra chalcogramma, with data collected using a calibrated ME70 multibeam sonar. The ME70 has reduced side-lobes and a very high dynamic range, which allow better characterization of the water column backscatter than typical multibeam systems. For this study, the sonar was configured with a 120 deg swath composed of 31 narrow bandwidth beams, ranging from 70–120 kHz. Data were collected during winter 2009 in the Gulf of Alaska and summer 2009 in the Bering Sea to evaluate whether seasonal and geographical differences existed in the juvenile fish aggregation patterns. Size- and shape-related aggregation descriptors (e.g., height, length, volume, and surface area) are described, and the variability in these metrics as a function of time and space is explored. Particular challenges for using the ME70 as a tool to describe the small-scale spatial patterns of marine animals are highlighted." @default.
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- W1969590943 date "2009-10-01" @default.
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- W1969590943 title "Use of a multibeam sonar to characterize fish aggregations in the northern Pacific." @default.
- W1969590943 doi "https://doi.org/10.1121/1.3249174" @default.
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