Matsya also known as Malsya, is the avatar of the Hindu god Vishnu in the form of a fish. Often listed as the first avatar in the lists of the ten primary avatars of Vishnu, Matsya is described to have rescued the first man, Manu, from a great deluge. Matsya may be depicted as a giant fish, or anthropomorphically with a human torso connected to the rear half of a fish.
The earliest accounts of the legend associate Matsya with the creator god Prajapati (identified with Brahma). However, Puranic scriptures incorporate Matsya as an avatar of Vishnu. Matsya forewarns Manu about an impending catastrophic flood and orders him to collect all the grains of the world in a boat; in some forms of the story, all living creatures are also to be preserved in the boat. When the flood destroys the world, Manu – in some versions accompanied by the seven great sages – survives by boarding the ark, which Matsya pulls to safety. In later versions of this story, the sacred texts Vedas are hidden by a demon, whom Matsya slays: Manu is rescued and the scriptures are recovered. The tale is in the tradition of the family of flood myths, common across cultures.