1. MATSYA (Fish) Avatar: (Satya Yuga). During the deluge before the latest re-creation of the universe, the four Vedas (the holy scriptures) which were required by Brahma for the re-creation, were drowned deep in the waters. Vishnu took the form of a fish to retrieve the sacred scriptures. Another legend has it that Vishnu in his Matsya Avatar instructed Manu (the progenitor of mankind in each creation) to build a huge boat and gather samples of all species in it. The Matsya then pulled the ark to safety through the deluge and floods to enable Brahma to start the work of re-creation.
2. KACHYUP or KURMA (Tortoise) Avatar: (Satya Yuga). The gods (Devas), suddenly lost their immortality due to the curse of a sage, soon after the new creation of the universe. Afraid of the Asuras (Demons), they turned for help to Vishnu who advised them to churn the ocean to obtain Amrita (Ambrosia), which would restore their power. The churning had to be done with the Man