Crown-Of-Thorns Removal

We love diving in Rarotonga – great visibility and warm water make scuba diving and snorkeling in Rarotonga extremely fun. Adding to it our fascinating marine life explains why many divers keep coming back year after year.
Amongst our natural reef inhabitants are the beautiful Crown-Of-Thorns starfish, aka COTS and locally known as taramea. COTS are natural reef predator and have evolved over millions of years. Crown-Of-Thorns starfish are feeding on coral and are important for the natural growth and health of the coral reefs. Their preferred food are fast growing corals. By eating fast growing corals they make space for the slower growing reef building corals, which is important for the growing of the coral reef.
As long as Crown-Of-Thorns numbers stay within normal, sustainable limits, these starfish have an important role to keep coral reefs healthy. Problems start when the COTS reproduce too fast. In great numbers, Crown-Of-Thorns can become highly destructive to coral reefs. The reasons for faster than usual reproduction rates are not fully understood, but it is believed that factors like high nutrient levels, climate change and lack of natural predators can contribute to fast reproduction rates.
Rarotonga ‘s reefs are stunning with beautiful hard coral formations. During the last months, higher than usual COTS numbers have appeared on Rarotonga’s reefs, mainly on the north and north-west coasts of the island. To help keep our reefs healthy and to control the COTS population to prevent an outbreak, we have been helping alongside NGO Kōrero o te ‘Ōrau and Ministry of Marine Resources Cook Islands with the removal/ culling of COTS.

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