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Shatapatha-Brahmana, I, 8, 1-6.
1. In the morning they brought to Manu water for washing, just as now also they (are wont to) bring (water) for washing the hands. When he was washing himself, a fish came into his hands.
2. It spake to him the word, 'Rear me, I will save thee!' 'Wherefrom wilt thou save me?' 'A flood will carry away all these creatures: from that I will save thee!' 'How am I to rear thee?'
3. It said, 'As long as we are small, there is great destruction for us: fish devours fish. Thou wilt first keep me in a jar. When I outgrow that, thou wilt dig a pit and keep me in it. When I outgrow that, thou wilt take me down to the sea, for then I shall be beyond destruction.'
4. It soon became a ghasha (a great fish); for that grows largest (of all fish). Thereupon it said, 'In such and such a year that flood will come. Thou shalt then attend to me (i.e. to my advice) by preparing a ship; and when the flood has risen thou shalt enter into the ship, and I will save thee from it.'
5. After he had reared it in this way, he took it down to the sea. And in the same year which the fish had indicated to him, he attended to (the advice of the fish) by preparing a ship; and when the flood had risen, he entered into the ship. The fish then swam up to him, and to its horn he tied the rope of the ship, and by that means he passed swiftly up to yonder northern mountain.
6. It then said, 'I have saved thee. Fasten the ship to a tree; but let not the water cut thee off whilst thou art on the mountain. As the water subsides, thou mayest gradually descend!' Accordingly he gradually descended and hence that (slope) of the northern mountain is called 'Manu's descent.' The flood then swept away all these creatures and Manu alone remained here.
Matsyavatara (The Fish Incarnation) [From the Bhagavata VIII].
There was an intermediate deluge; [*F1] Brhama slept for a while; the demon Hayagriva stole the Vedas. Lord Vishnu noticed this and took the form of Fish. In the Dravida country, there was a pious King, Satyavrata by name; as he was making an offering of water in the Kritamala river, the Lord appeared as a tiny Fish in the water of his palm. The Fish began to grow, and wonderng at this, the King went on transferring it from one vessel or container to another. The Fish, which had finally to be deposited in the sea, told him: "On the seventh day from now, all the worlds will become completely flooded; on the flood waters, a boat will come to you; embark in it with manifold herbs and seeds and surrounded by the seven great sages and every class of living beings; a strong gale will rock the boat, but tie it to my snout with the great serpent, and as you ask me questions, I shall expound to you then the glory of Myself, the Supreme Brahman." Accordingly the sea swelled as huge rain-clouds poured down incessantly, rolled on and engulfed the world; the boat appeared, and also the great Fish; to its single snout, Satyavrata tied the ark. Dragging the ark over the waters, the Lord as a Fish imparted to Satyavrata the teachings about Truth which were collected in the Purana known as the Matsya (Fish). After the waters of the deluge had subsided, the Lord slew the demon Hayagriva and restored the Vedas to Brahma, who had awoke from his slumber. [Raghavan, The Indian Heritage, p. 377.]