Matsya Purana — Solar Dynasty Prelude: Vivasvān–Saṃjñā–Chāyā
कृकवाकुर्मया दत्तो यः कृमीन्भक्षयिष्यति क्लेदं च रुधिरं चैव वत्सायम् अपनेष्यति //
kṛkavākurmayā datto yaḥ kṛmīnbhakṣayiṣyati kledaṃ ca rudhiraṃ caiva vatsāyam apaneṣyati //
“Given by me in the form of the bird Kṛkavāku, this will devour the worms; and it will also remove the oozing moisture and the blood from the calf.”
This verse does not address Pralaya directly; it reflects the Matsya Purana’s practical, preservative concern for sustaining life—here, protecting livestock/offspring by removing parasites and harmful discharge.
It supports the dharmic duty of protection and welfare: a householder (and by extension a king) is expected to safeguard dependents and resources—cattle and calves being central to agrarian prosperity—through appropriate remedies and care.
No Vastu or temple-architecture rule is stated; the ritual significance lies in a prescribed protective/curative measure framed as a boon/instruction from the deity for removing worms and pathological discharge.