SB 8.7.18
nirmathyamanad udadher abhud visam
maholbanam halahalahvam agratah
sambhranta-minonmakarahi-kacchapat
timi-dvipa-graha-timingilakulat
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
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 timingila 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 halahala.