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- W1993130320 abstract "In principle, the average target strength of fish in a defined volume can be estimated in situ from the ratio between the volume backscattering strength and a count of the number of fish in the volume. The chief problems, which have precluded use of the method in practice, are the difficulty in obtaining reliable counts at common fish densities and in defining beam volume. It is suggested that both problems could be solved to a large extent by using a relatively modest high-frequency, multi-beam echo-sounder as a counter. This presentation outlines the underlying principle of the method, considers the design criteria, and describes a 48-element 420 kHz system, (code named abacus) which is being built to test the method. The system, which has been designed to operate to approximately 70 m, for target strengths in the range 40 to 55 dB, generates a single transmit beam and 32 receiving beams orthogonal to it, which intersect to give up to ten 1 deg × 1 deg resolution cells. Preliminary test-tank results are presented, and plans for further experimental work discussed. It is believed that the method should be capable of delivering in situ target strength estimates at densities well beyond the limit of current methods." @default.
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- W1993130320 creator A5067609061 @default.
- W1993130320 date "2001-05-01" @default.
- W1993130320 modified "2023-09-24" @default.
- W1993130320 title "Use of multiple‐beam echo‐sounders for estimation of target strength in situ" @default.
- W1993130320 doi "https://doi.org/10.1121/1.4744002" @default.
- W1993130320 hasPublicationYear "2001" @default.
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