The influence of the shape of meshes on the selective properties of trawls with special reference to Antarctic krill

The results of investigations are presented on selective properties of experimental trawls with a square- and diamond-shaped mesh, on the traumatic rate of krill passed through a mesh and remained in the trawl,on the survival rate. When trawls with a square-shaped mesh were used the highest screening rate was observed in the cod end instead of the belly,the selective properties of the retaining part of the trawl are improved and at the same time the selectivity range of retained fish gets lower, from 14 mm to 9.3 mm.