Target strength measurements of gilthead sea bream with single-beam quantitative echosounder

Abstract

[EN] Target strength (TS) measurements for ventral aspect of gilthead sea bream (Sparus aurata) have been performed in a scaled aquaculture cage. The measurements have been made with a Simrad EK-60 scientific echososunder working at 200 kHz with a single-beam composted transducer specific of the Simrad ES15 echosounder (aperture of 30 degrees), designed for aquaculture control among other applications. Linear relationships of TS versus the logarithms of length have been derived. It must been underlined the obtaining of high values of the correlation coefficients and a high resolution of the ventral expressions for fish size predictions. Lower mean values of TS distributions are obtained for single-beam mesurements respect split-beam measurements as expected.