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Threats to the Marine Environment

Invasive Species

Gorilla Seaweed, Gracilaria salicornia, Waikiki


Kappaphycus, Kaneohe Bay, Oahu


Bubble Alga, Dictyosphaeria cavernosa, Kaneohe Bay

Cladophora, Oahu

Mudweed, Avrainvillea amadelpha, Oahu


Hypnea musciformis, Oahu


Acanthophora spicifera, Oahu

Taape, Lutjanus kasmira, Oahu


Roi, Cephalopholis argus, Kona, Hawaii

Invasive species are a serious problem around the world.  Many are introduced to an area where natural population controls are absent.  Environmental changes may also cause benign native species to reproduce rapidly and become invasive.

Invasive algae (seaweed) form extensive tangles or mats that smother & displace corals & diverse marine life.  Alien fish compete with or prey upon natives, many of which are commercially important.