Low-frequency target strength and abundance of shoaling Atlantic herring (Clupea harengus) in the Gulf of Maine during the Ocean Acoustic Waveguide Remote Sensing 2006 Experiment
Name
Low-frequency target strength JASA_2010.pdf
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Author(s)
Gong, Zheng
Andrews, Mark
Jagannathan, Srinivasan
Patel, Ruben
Jech, J. Michael
Makris, Nicholas
Ratilal, Purnima
Date Issued
2010
Journal
Journal of the Acoustical Society of America
Publisher
American Institute of Physics
Citation
Gong, Zheng, Mark Andrews, Srinivasan Jagannathan, Ruben Patel, J. Michael Jech, Nicholas C. Makris, and Purnima Ratilal. “Low-Frequency Target Strength and Abundance of Shoaling Atlantic Herring (Clupea Harengus) in the Gulf of Maine During the Ocean Acoustic Waveguide Remote Sensing 2006 Experiment.” The Journal of the Acoustical Society of America 127, no. 1 (2010): 104. © 2010 Acoustical Society of America.
Version
Final published version
Abstract
The low-frequency target strength of shoaling Atlantic herring (Clupea harengus) in the Gulf of Maine during Autumn 2006 spawning season is estimated from experimental data acquired simultaneously at multiple frequencies in the 300–1200Hz range using (1) a low-frequency ocean acoustic waveguide remote sensing (OAWRS) system, (2) areal population density calibration with several conventional fish finding sonar (CFFS) systems, and (3) low-frequency transmission loss measurements. The OAWRS system’s instantaneous imaging diameter of 100km and regular updating enabled unaliased monitoring of fish populations over ecosystem scales including shoals of Atlantic herring containing hundreds of millions of individuals, as confirmed by concurrent trawl and CFFS sampling. High spatial-temporal coregistration was found between herring shoals imaged by OAWRS and concurrent CFFS line-transects, which also provided fish depth distributions. The mean scattering cross-section of an individual shoaling herring is found to consistently exhibit a strong, roughly 20dB/octave roll-off with decreasing frequency in the range of the OAWRS survey over all days of the roughly 2-week experiment, consistent with the steep roll-offs expected for sub-resonance scattering from fish with air-filled swimbladders.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1121/1.3268595
