What you can see in this YouTube clip is very different from most of the underwater footage that you will come across online.

But this effect was reversed in areas where New Zealand's endemic sea urchin, kina, has grazed off the kelp. These regions are known as kina barrens and they dominate many non-protected reefs.

Invasive kelp gets KO from kick-ass kina. Sam McKnight 05:15, Jun 16 2011. Thousands of kina will be used ... who stopped in Fiordland while circumnavigating New Zealand. ...

Fisheries New Zealand is seeking feedback on two proposed measures to help address kina barrens and rebalance local ecosystems. The proposals include a new special permit for targeted culling ...

Fisheries New Zealand has introduced two proposals to tackle kina barrens on the North East coast of Aotearoa. Kina barrens are areas where the spiky sea urchins have grazed through kelp forests ...

A temporary lifting of the rāhui at Maitai Bay has removed more than 1000 kina to help battle the kina barren blanketing the bay. The Maitai Bay rāhui , ...

A team of four from Whanganui have been crowned New Zealand's best. The Last Kina Karvers were crowned champions of the Kina Eating Competition at the Whakatane Seafood Festival. Jay Rerekura ...