Commercial ships represent the largest transport mechanism (vector) by which marine invasive species are moved around the globe. Tiny planktonic biota (e.g., fish and invertebrate larvae, zooplankton, phytoplankton, bacteria and viruses) occur in great numbers in unmanaged ballast water tanks. Understanding the voyage and ballast water management histories of ships, as well as the volumes of managed and unmanaged ballast water discharged to ports of the United States, enables the NBIC to assess invasion opportunity and risk associated with ships.
In order to fully evaluate the status and trends in ballast water discharge to the United States, it is useful to analyze both temporal and spatial patterns. You can explore changes in volume of discharged ballast water by category of ballast water (coastwise ballast water, overseas ballast water, or the combined total) and type of ship over time. You can determine the spatial level of interest: National, Coastal Region, or State.
Note: All data available in graphs and tables extend through the last complete month and are refreshed monthly. Because ballast water management reports may be amended, corrected or changed during quality control processes, particularly within the 20 days from arrival date for the last complete month, this may result in updates that will register when the data are next refreshed. All data are subject to change and use of any of the NBIC data implies agreement with the NBIC Data Use Agreement policy. Cite our data.
Temporal Patterns of BW Discharge
Temporal Patterns of Discharge by Ship Type