Saved Vaivasvata Manu in the Cakshusha-era flood
'Caksumodadhi-samplave... apad vaivasvatam manum' (SB 1.3.15).
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Matsya
मत्स्य
Matsya is Vishnu's fish avatara: in puranic tradition the first incarnation, who at the cosmic flood saved Vaivasvata Manu with the boat and preserved the Vedas. SB 1.3.15: 'rupam sa jagrihe matsyam caksumodadhi-samplave' — assuming the fish form at the Cakshusha-era flood He protected Manu.
Śrīmad Bhāgavata Mahāpurāṇa 1.3.15 — Sanskrit Wikisource (pinned oldid=369178)
Matsya — avatara of — Krishna
He assumed the fish form at the Cakshusha-era flood: 'rupam sa jagrihe matsyam' (SB 1.3.15). Evidence: EXPLICIT.
Matsya — rescued — Vaivasvata Manu
Embarking him on the boat, the Fish protected Vaivasvata Manu: 'apad vaivasvatam manum' (SB 1.3.15). Direction verified. Evidence: EXPLICIT.