According to the Wold Ocean Council (WOC), cargo ships transport between 7,000-10,000 aquatic species each day across oceans. This creates a major pathway for aquatic invasive species to spread. This being said the WOC has called for an urgent ratification of the Ballast Water Convention that was approved in 2004. The international treaty has not been enforced yet due to the lack of government ratification. One ratified, the Ballast Water Convention will enter 30 nationals, representing 35% of the world's merchant shipping.
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