Plastic is the dominating category of litter at the sea floor in the North Sea (85 %) as well as in the Baltic Sea (68%). All together 80% of the collected litter items are plastic. These results of the Thünen-Institute of Fisheries Ecology are in good agreement with those of other investigations. Whithin the main category „plastic“ the sub categories “A2 sheet”, “ A5 fishingline, monofilament” and “A7 synthetic rope” were the most frequent (Marine Litter Gallerie).
These results are based on fishery catches with bottom trawls (175 trawls, 2013 -2015) in North Sea and the southern Baltic Sea. Litter items were categorized according to an international standard (IBTS-protocol).