Final answer:
Container ships have become one of the primary ship types used to move cargo globally. They accounted for a significant number of overseas arrivals and discharged smaller volumes of ballast water. The magnitude of ballast water flux from container ships was less than 3% of the total flux.
Step-by-step explanation:
It is difficult to determine the exact number of supertankers or containerships that go missing each year without a trace. However, according to the available information, container ships have become one of the primary ship types used to move cargo globally. In the years 2011-2013, container ships accounted for a significant number of overseas arrivals and discharged much smaller volumes of ballast water per discharge event compared to other ship types. Although the magnitude of ballast water flux from container ships was less than 3% of the total flux, the inoculation frequency by container ships was relatively high on the East and West coasts.