USFC Phalarope was an American fish culture and fisheries science research vessel that operated along the coast of New England. She was part of the fleet of the United States Commission on Fish and Fisheries, generally referred to as the United States Fish Commission, from 1900 to 1903 and in the fleet of its successor, the United States Bureau of Fisheries, as USFS Phalarope from 1903 until 1917 and again from 1919 until fiscal year 1933. She was in commission in the United States Navy as the patrol vessel USS Phalarope from 1917 to 1919, seeing service during World War I. Before her United States Government service, she was the steam yacht Adelita.