The fish, sharks, tortoises and snakes were most agitated and perturbed. The entire ocean became turbulent, and even the large aquatic animals like whales, water elephants, crocodiles and timiṅgila fish [large whales that can swallow small whales] came to the surface. While the ocean was being churned in this way, it first produced a fiercely dangerous poison called hālahala.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
निर्मथ्यमानादुदधेरभूद्विषं महोल्बणं हालहलाह्वमग्रतः । सम्भ्रान्तमीनोन्मकराहिकच्छपा- त्तिमिद्विपग्राहतिमिङ्गिलाकुलात्
nirmathyamānādudadherabhūdviṣaṃ maholbaṇaṃ hālahalāhvamagrataḥ | sambhrāntamīnonmakarāhikacchapā- ttimidvipagrāhatimiṅgilākulāt
SB 8.7.18