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A COMPARISON BETWEEN ACOUSTICALLY DERIVED sA ESTIMATES AND THOSE DERIVED FROM NETS

In this paper, a comparative analysis of the area backscattering coefficients sA derived from acoustics and nets is presented. The sA values were integrated within a layer of 2-m thickness (0.5 m off the seabed) and correction made for the acoustic deadzone. This layer was comparable to the headline height of 2 m on average. The net data were converted to the equivalent area backscattering coefficients, sA(catch). Results showed that the two sA estimates were equivalent in a sense that they both clustered around the 1-1 correspondence line. Substantial variations are observed however, which may involve uncertainties in target strength, net efficiency and spatial distribution of targets