 In Herald Bight off Western Australia, a known nursery, juvenile sicklefin lemon sharks frequent open areas and mangroves in water under deep, but not areas covered by the seagrass "Posidonia australis".The sicklefin lemon shark has a robust, stocky body and a short, broad head.The snout is rounded or almost wedge-shaped, with small nostrils bearing triangular flaps of skin in front.