Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 40

Sanskrit:

श्रीसमुद्र उवाचन चाहार्षमहं देव दैत्य: पञ्चजनो महान् ।अन्तर्जलचर: कृष्ण शङ्खरूपधरोऽसुर: ॥ ४० ॥

ITRANS:

śrī-samudra uvācana cāhārṣam ahaṁ devadaityaḥ pañcajano mahānantar-jala-caraḥ kṛṣṇaśaṅkha-rūpa-dharo ’suraḥ

Translation:

The ocean replied: O Lord Kṛṣṇa, it was not I who abducted him, but a demonic descendant of Diti named Pañcajana, who travels in the water in the form of a conch.

Purport:

Clearly the demon Pañcajana was too powerful for the ocean to control; otherwise the ocean would have prevented such an unlawful act.