Examples of viviparous fish include the surf-perches, splitfins, and lemon shark. Located on South Bimini Island, it has done much research regarding the lemon shark. Several apparently unprovoked attacks on humans have been attributed to the sicklefin lemon shark. The lemon shark was first named and described in 1868 by Felipe Poey. The sicklefin lemon shark has a robust, stocky body and a short, broad head. The lemon shark ("Negaprion brevirostris") is a species of shark from the family Carcharhinidae.