The Lord assumed one fish incarnation to save the Vedas at the beginning of the Svayambhuva-manvantara, and at the end of the Caksusa-manvantara the Lord again assumed the form of a fish just to favor the great king named Satyavrata

Expressions researched:
"The Lord assumed one fish incarnation to save the Vedas at the beginning of the Svāyambhuva-manvantara, and at the end of the Cākṣuṣa-manvantara the Lord again assumed the form of a fish just to favor the great king named Satyavrata"

Srimad-Bhagavatam

SB Canto 8

The Lord assumed one fish incarnation to save the Vedas at the beginning of the Svāyambhuva-manvantara, and at the end of the Cākṣuṣa-manvantara the Lord again assumed the form of a fish just to favor the great king named Satyavrata. As there were two incarnations of Varāha, there were also two incarnations of fish.

SB 8.24.10, Translation and Purport

During the Cākṣuṣa-manvantara there was a great king named Satyavrata who was a great devotee of the Supreme Personality of Godhead. Satyavrata performed austerities by subsisting only on water.

The Lord assumed one fish incarnation to save the Vedas at the beginning of the Svāyambhuva-manvantara, and at the end of the Cākṣuṣa-manvantara the Lord again assumed the form of a fish just to favor the great king named Satyavrata. As there were two incarnations of Varāha, there were also two incarnations of fish. The Lord appeared as one fish incarnation to save the Vedas by killing Hayagrīva, and He assumed the other fish incarnation to show favor to King Satyavrata.