SB 11.4.18
gupto ’pyaye manur ilausadhayas ca matsye
kraude hato diti-ja uddharatambhasah ksmam
kaurme dhrto ’drir amrtonmathane sva-prsthe
grahat prapannam ibha-rajam amuñcad artam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In His appearance as a fish, the Lord protected Satyavrata Manu, the earth and her valuable herbs. He protected them from the waters of annihilation. As a boar, the Lord killed Hiranyaksa, the son of Diti, while delivering the earth from the universal waters. And as a tortoise, He lifted Mandara Mountain on His back so that nectar could be churned from the ocean. The Lord saved the surrendered king of the elephants, Gajendra, who was suffering terrible distress from the grips of a crocodile.