Epidemiologists study outbreaks of diseases, the causes, locations, and how various communities are affected, utilizing relative information to aid in the prevention of future outbreaks. Epidemiologists help to keep the public informed of methods to maintain and improve public health.
Based on these criteria, the smallest known extant shark species appears to be Etmopterus perryi, males of which mature at 16 to 17.5 cm TL and gravid females have been found at 19 to 20 cm TL (Springer & Burgess 1985).
The black tip reef shark is also known as the blacktip reef shark, black-tip reef shark, black finned shark, blacktip shark, black finned shark and Guliman (for a full list of names, click here to see the list on FishBase.lacktip reef sharks are not considered dangerous to humans, although they may bite if they interact with humans in shallow waters. According to the International Shark Attack File, there have been only 11 non-fatal, unprovoked attacks of black tip reef sharks on humans in the years 1580 - 2012.