TRAWL Russian patent published in 2000 - IPC

FIELD: fish industry. SUBSTANCE: trawl includes net bag with accessories and acoustic radiating system which consists of group of wave shapers of maxima of acoustic intensity of high and low radiation frequencies moving along surface of trawl from zone of termination of trawl bag ) fine-mesh portion of sweep-net) in direction of trawl mouth and further. Acoustic radiating system consists of ground of driving radiation units and the same number of groups of driven radiation units; their number is equal to number of shapers. Driving and driven radiation units are provided with parametric radiating acoustic arrays. Each array is acoustically connected with one of driving radiation units, thus enhancing effect on fish behavior. EFFECT: enhanced effect of acoustic action on fish behavior; increased catch capacity of trawl of full absence of effect of acoustic field on trawl selectivity. 1 dwg