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 dwarf lanternshark (Etmopterus perryi) is a little-known species of dogfish shark in the family Etmopteridae and possibly the smallest shark in the world, reaching a maximum known length of 21.2 cm (8.3 in).erhaps the smallest living shark species, male dwarf lanternsharks mature at a length of 16â17.5 cm (6.3â6.9 in) and females from a length of 15.5 cm (6.1 in) with 19â20 cm (7.5â7.9 in) long pregnant individuals known.