Analysis of the Antarctic krill (Euphausia superba) commercial and research fishery in 1970-ies and 1980-ies showed that different modifications of midwater trawls applied had comparatively low catchability, as a rule, 10-20%. The experiments showed that while percolated through large meshes 40-50% of the «percolated» individuals were injured, at the same time while «punched» through small meshes of the trawl codend 60 to 100% of individuals perished. There are two main aspects of this problem: economic and ecological.
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