The Thünen-Institute collects marine litter data since years. Litter items catched by bottom trawling on our fishery research ships are classified using the IBTS protocoll (International Bottom Trawl Survey).
The main IBTS categories are:
Below these main categories 40 sub categories are defined to classify litter items. For each item in the net length, weight and IBTS category were determined and a photo was taken for documentation.
The Marine Litter Gallery shows typical examples of litter items from the sea floor - one picture for each subcategory, if available.