A key international measure for environmental protection that aims to stop the spread of potentially invasive aquatic species in ships’ ballast water enters into force. The International Convention for the Control and Management of Ships' Ballast Water and Sediments (BWM Convention) addresses aquatic invasive alien species (IAS) by requiring all ships to implement a ballast water management plan, among other actions.
See also: Ballast Water Convention Enters into Force (Sep 12, 2017)
Usually ballast water is pumped into ballast tanks when a ship has delivered cargo to a port and is departing with less cargo or no cargo. Ballast water is then transported and released at the next port-of-call where the ship picks up more cargo. If a ship is receiving or delivering cargo to a number of ports, it may release or take on a portion of ballast water at each port. In such cases, the shipís ballast water contains a mix of waters from multiple ports.
The release of ballast water may introduce non-native organisms into the port of discharge. These introduced species, or bioinvaders, are also referred to as exotic species, alien species and nonindigenous species. (Source: Massachusetts Institute of Technology Sea Grant - Ballast Water)