remained. In 1888, a Risso's dolphin appeared in the sounds. This dolphin became famous as Pelorus Jack and became the first dolphin in the world to receive the protection of the law. Pelorus Jack would accompany boats to and from the notorious French Pass. He would join boats bound for Nelson at the entrance to Pelorus Sound and for eight kilometres would ride their bow waves to Pelorus Sound. He did not go through the pass with them, but would meet returning boats as they exited the pass. Pelorus Jack was last seen in April 1912. The lightkeeper at French Pass claimed he found the body of Pelorus Jack decomposing on the shore. During World War II, coastal fortifications were constructed on Maud Island to protect Cook Strait, and the entrance to the sound. These fortifications included a 6in Mk 7 gun emplacement, and range finding equipment that is still there today. In 1906, New Zealand purchased its first naval ship, a sail training ship called NZS Amokura. It became a coal hulk in 1922, and in 1953 was towed into St Omer Bay in Kenepuru Sound, an arm of Pelorus Sound. It was used there as a store hulk and jetty. Reported broken up in 1955, her remains lie on the beach in the southern end of the bay. In August 2014, the name of the sound was officially altered to Pelorus Sound / Te Hoiere. Industry Marine farming Over 80 percent of New Zealand's aquaculture exports - worth more than $NZ 200 million per annum - come from the Marlborough Sounds. Most of the marine farms are in Pelorus Sound. Most of the exports involve green-lipped mussels. A New Zealand sea sponge, Mycale hentscheli, which grows in Pelorus Sound, may hold the key to an anti-cancer drug. Scientists are working to see how peloruside, a substance produced by the sponges, might be used as a cancer-fighting drug. Marine farmers are helping Victoria University of Wellington and NIWA develop a method for growing the sponge on an existing mussel farm. Trial mussel farms began in the Marlborough Sounds in the late 1960s. In the Pelorus Sound waters, mussel farms started in Kenepuru Sound and in Crail Bay. Subsequently, Pelorus has become the major mussel-producing area in New Zealand. Initially, the mussels were cultured on ropes suspended from rafts. It was a labour-intensive method which has since been replaced with