in Belgian part of the North Sea: Aquaculture: accidental [details]
in Belgian part of the North Sea: Fisheries: deliberate translocations of fish or shellfish to establish or support ... [details]
in Belgian part of the North Sea: Ships: accidental as attached or free-living fouling organisms [details]
in Belgian part of the North Sea: Ships: accidental with ballast water, sea water systems, live wells or other deck ... [details]