Correlation between the catch and the traces on the net sounder echograms in the function of trawling speed

Abstract

       This paper gives an analysis of the dependence between the shoal traces registered on the net sounder echograms and the results of the catch at various trawling speeds. The analysis involves the results of pilchard, horse ­mackerel, mackerel, and cutlass fish catches. These researches have shown that the trawling speed is a very  important factor in catching the pelagic fish that live in shoals.