Lemon shark. Lemon sharks (Negaprion brevirostris) can reach a length of over 3 metres and inhabit coral keys, docks, bays and river mouths in coastal regions. They are usually marine, but will occasionally enter freshwater areas, only entering the open sea in order to mate. They are found on continental shelves in the coastal regions of the Atlantic from the USA to Brazil, and in the Pacific from Baja California, Mexico, to Ecuador. Photographed on Little Bahama Bank, Grand Bahama.