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- W2080835940 abstract "Field measurements are used to show that the detailed behavior of fish shoals can be continuously monitored at roughly 1-min intervals over wide areas spanning hundreds of square kilometers by long range acoustic waveguide sensing. The technique was used on the New Jersey Continental Shelf to produce unprecedented video images of shoal formation, fragmentation, and migration. Simultaneous line-transect measurements show the imaged shoals to contain pelagic fish with densities of at least one individual per meter3. The technique relies upon acoustic waveguide propagation in the continental shelf. Here, trapped modes dominate propagation and suffer only cylindrical spreading loss rather than the spherical loss suffered in free-space transmission or short-range propagation in the ocean. In contrast, standard methods for fish surveyance involve line transect measurements from slow moving research vessels that significantly under-sample fish distributions in time and space, leaving an incomplete behavioral picture. The implications of this bioclutter phenomenon on the Navy’s long range active sonar operations in continental shelf environments are discussed." @default.
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- W2080835940 date "2004-05-01" @default.
- W2080835940 modified "2023-10-01" @default.
- W2080835940 title "Continuous wide area monitoring of fish shoaling behavior with acoustic waveguide sensing and bioclutter implications" @default.
- W2080835940 doi "https://doi.org/10.1121/1.4784810" @default.
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