Bulls, possessed of such marks as are mentioned in the scriptures, and aquatic animals were properly tied to the stakes after the rites of the sacrificial fire had been performed.
ऋषभाः शास्त्रपठितास्तथा जलचराश्च ये। सर्वोस्तानभ्ययुजस्ते तत्राग्निचयकर्मणि॥