With less than 200 individuals, orca found in NZ waters are classified as Nationally Critical and it is important to remember that it is illegal to swim with them in the wild there!
For more information on NZ orca visit the Orca Research Trust website and Facebook page - www.orcaresearch.org
Wherever you are in the world, make sure you always find out the laws specific to that location which outline the regulations for approaching wild orca.
http://www.telegraph.co.uk/news/worldnews/australiaandthepacific/newzealand/4237963/Surfer-shares-waves-with-three-killer-whales.html