Kappaphycus alvarezii invades Gulf of Mannar

The invasive Kappaphycus alvarezii seaweed, which smothers and kills coral reefs, has spread its wings to coral reef areas in Valai island in the Gulf of Mannar (GoM) and is set to invade new coral colonies in the marine national park.

Area of Influence

  • After invading Shingle, Kurusadai and Mulli islands in Mandapam cluster of the GoM, the red algae invaded Valai island along Kilakarai coast following its cultivation in south Palk Bay.
  • A 2005 Government Order had restricted cultivation of the exotic seaweed only to the seawaters north of the Palk Bay and South of Thoothukdi coast.


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