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- W2012103132 abstract "We evaluated the loss of sensitivity due to the motion experienced by a hull-mounted transducer and its effects upon the estimated biomass of southern blue whiting ( Micromesistius australis ) in an acoustic survey conducted in the southeastern Pacific, off the Chilean coast, during the austral winter of 2009. Vessel motion data (pitch and roll) were registered in situ using a digital clinometer and used to correct the nautical area scattering coefficients (NASC) in elementary sampling units of 926 m distance by 10 m depth. These NASC correction factors (NASC CF ) were calculated using Dunford's algorithm for circular transducers. We found high variability in NASC CF , which averaged 12%, and ranged between 0 and 50%. NASC CF variability was explained significantly by the mean depth of the integrated stratum (33%), the weather condition, as measured by Beaufort's scale (5%), and the vessel course relative to wind direction (2%). The empirical model we used to explain NASC CF variability may be suitable for correcting bias due to transducer motion in other, past and future, fisheries acoustic surveys targeting mid-water species under rough weather conditions." @default.
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- W2012103132 date "2012-09-10" @default.
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- W2012103132 title "Reducing uncertainty and bias in acoustic biomass estimations of southern blue whiting (Micromesistius australis) in the southeastern Pacific: transducer motion effects upon acoustic attenuation" @default.
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- W2012103132 doi "https://doi.org/10.3856/vol40-issue3-fulltext-21" @default.
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