Port Adelaide, gateway to St Vincent's Gulf, is the very lifeblood of Port Adelaide township. The harbor is home to many fishing trawlers, container ships and cruise boats. The Australian Submarine Corporation also has its base on the river. Cruises along the Port Adelaide River are very popular, with sightings of dolphins and pelicans common. Further down river, mangrove swamps in the creeks of Torrens Island provide an important nursery for many species of fish, including Australia's celebrated King George Whiting.