In the United States, researchers from the Smithsonian Environmental Research Center in Maryland found that the ballast water carried by ocean - going vessels contains high numbers of bacteria and viruses.
Di Amerika Serikat, para peneliti dari Pusat Penelitian Lingkungan Smithsonian di Maryland mendapati bahwa air balas yang dibawa kapal - kapal samudra mengandung sejumlah besar bakteri dan virus.