Matsya Purana — Intermediate Dissolution
भुजंगरज्ज्वा मत्स्यस्य शृङ्गे नावमयोजयत् उपर्युपस्थितस्तस्याः प्रणिपत्य जनार्दनम् //
bhujaṃgarajjvā matsyasya śṛṅge nāvamayojayat uparyupasthitastasyāḥ praṇipatya janārdanam //
Using the serpent as a rope, he fastened the boat to the horn of the Fish; then, standing upon it, he bowed down in reverence to Janārdana (Lord Viṣṇu).
It depicts the practical moment of survival during pralaya: the boat is secured to Lord Matsya’s horn with a serpent-rope, showing divine guidance and protection through cosmic dissolution.
Manu’s act of securing the boat and then bowing to Janārdana models disciplined action joined with devotion—an ethical ideal in the Purāṇas: perform one’s duty responsibly while recognizing divine sovereignty.
There is no direct Vāstu or temple-rule instruction here; the ritual element is reverential submission (praṇipāta) to Viṣṇu, highlighting devotion as the proper response after undertaking protective rites/actions.