The Natal Sharks Board (NSB) services 29 kilometers of netting, spread at intervals along 320 km of coastline in KwaZulu-Natal, thereby providing protection against shark attack at 38 localities. It employs about 170 staff members, most of whom put to sea on 17 boats to service the nets. The other members of staff are engaged in research, administration, public relations, store-keeping and maintenance. The humpback dolphins are characterized by the conspicuous humps and elongated dorsal fins found on the back of adult members of the species. These dolphins rarely reach a length of 2,.5 meter. At birth they are approx. 1 meter and by the time they are fully grown adults can weigh up to 200 kg. Humpback dolphins feed on fish that live close to the seabed and fish that live on reef but have been known to also eat squid and other such creatures. In general they feed independently of others in the group. They are found close to shore along the coast of West Africa and right along the coast of the Indian Ocean from South Africa to Australia.