This is the first avatar of Lord Maha VISHNU that is in the form of fish. This incarnations(avatar) has appeared in the Krita Yuga(the first yuga of four yugas.).This incarnation has been taken by loard Vishnu to safely retrieve the Vedas that has been disappeared in the ocean by Asura called Hayagreevan.When Lord Brahma is resting in brahmalogam and Vedas were flowing out from their mouth.
Then an asura named Hayagreevan have stolen the Vedas and disappeared it in ocean, then Lord VISHNU take the incarnations of Matsya to retrieve it from ocean.
This Shila is very auspicious and extremely powerful, it radiates very high energy. As far as its main body is concerned it gives perfect impression of Matsya . The top marking of shila resembles Maha Vishnu and markings at the tail of the Shila resembles Maha Laxmi. The clear marking of Chakra at the back side of the Shila makes this Shila extremely rare and exotic. The resemblance of Vishnu and Maha Laxmi makes the Shila rare and having qualities of all these Gods.
Worshiping this auspicious Shaligram brings immense wealth and worldly comforts. The environment of the beholder's house and workplace becomes pious and all negativity is removed.It provide a peaceful environment . Matsya Shaligrama also provides sixth sense to the worshiper to see the future things happening and also it removes the Vastu Dosha. By worshiping this Shila an issueless woman is blessed with a virtuous son.