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 tiger shark (Galeocerdo cuvier) is a species of requiem shark and the only extant member of the genus Galeocerdo. Commonly known as the Sea Tiger, the tiger shark is a relatively large macropredator, capable of attaining a length over 5 m (16 ft).It is found in many tropical and temperate waters, and it is especially common around central Pacific islands.ommonly known as the Sea Tiger, the tiger shark is a relatively large macropredator, capable of attaining a length over 5 m (16 ft).