Portsea (or Port Sea) was launched at Calcutta in 1807. She was a country ship; that is, she primarily traded east of the Cape of Good Hope. She participated as a transport in the British invasion of Mauritius. She then carried French prisoners of war to France. She also made one voyage to St Helena from Bengal under charter to the British East India Company (EIC). In 1814 a storm dismasted her and she was lengthened, but it is not clear whether before or after the dismasting. She made two voyages as a South Seas whaler between 1828 and 1835. In 1838 she made one voyage transporting convicts to New South Wales. She carried coal to Valparaiso in 1840 and there her owners turned her into a coal hulk. Her final fate is not known.