New Zealand plans to ban commercial fishing near its coast and set up marine reserves to protect the rare Hector's dolphins, a government minister said on Thursday The Hector's dolphin is estimated to number around 7,400 from 29,000 in the late 1970s. However, one of its sub-species, the Maui dolphin, is said to be the rarest in the world and facing extinction with as few as 111 animals left. Fishing is blamed for up to three-quarters of the known deaths of Hector's dolphins.