Matsya Purana — Characteristics of Dvāpara and Kali Yugas
निःशेषेष्वथ सर्वेषु मत्स्यपक्षिपशुष्वथ संध्यांशे प्रतिपन्ने तु निःशेषास्तु तदा कृताः //
niḥśeṣeṣvatha sarveṣu matsyapakṣipaśuṣvatha saṃdhyāṃśe pratipanne tu niḥśeṣāstu tadā kṛtāḥ //
Then, when all had been completely exhausted—fish, birds, and beasts alike—and when the world had entered the twilight-portion (the liminal time of dissolution), they were at that time made utterly without remainder.
It depicts a pralaya-stage where living beings (fish, birds, animals) become “niḥśeṣa” (without remainder), occurring as the cosmos enters a twilight/junction phase (saṃdhyā-aṃśa) associated with dissolution.
Indirectly, it reinforces impermanence: kingship and household life are time-bound within kāla. The ethical implication in Purāṇic teaching is to govern and live dharmically, knowing all conditioned existence ends in dissolution.
No direct Vāstu or temple-rule detail appears in this verse; its significance is cosmological, highlighting saṃdhyā (junction-time), which in ritual thought broadly underscores liminal times as potent—but here it primarily marks dissolution.