Matsya Jayanti is believed to be the day when Sri Hari Vishnu appeared as Matsya Avatar (fish incarnation). Matsya Jayanthi 2015 date is March 22. Sri Hari Vishnu appeared as a one-horned fish to rescue the Vedas. Some scriptures also indicate that Matsya appears to warn about the great deluge or Mahapralaya that will destroy the universe and prepare it for regeneration.
Matsya Jayanthi is observed on third day (Tritiya) during the Shukla Paksha (waxing phase of moon) in the Chaitra Month in traditional Hindu calendar.
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