title: 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.
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 300-1200 Hz 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 100 km 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 20 dB/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.
authors.affiliation: Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, USA.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Gong
authors.forename: Mark
authors.initials: M
authors.lastname: Andrews
authors.forename: Srinivasan
authors.initials: S
authors.lastname: Jagannathan
authors.forename: Ruben
authors.initials: R
authors.lastname: Patel
authors.forename: J Michael
authors.initials: JM
authors.lastname: Jech
authors.forename: Nicholas C
authors.initials: NC
authors.lastname: Makris
authors.forename: Purnima
authors.initials: P
authors.lastname: Ratilal
mesh_terms: D000162:Acoustics; D000388:Air; D000400:Air Sacs / Q000502:physiology; D000465:Algorithms; D000818:Animals; D000835:Animals, Wild; D001267:Atlantic Ocean; D001522:Behavior, Animal; D002138:Calibration; D005399:Fishes / Q000033:anatomy & histology / Q000502:physiology; D008281:Maine; D008954:Models, Biological; D017711:Nonlinear Dynamics; D011156:Population Density; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors