jalesu mam raksatu matsya-murtir
yado-ganebhyo varunasya pasat
sthalesu mayavatu-vamano vyat
trivikramah khe vatu visvarupah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
May the Lord, who assumes the body of a great fish, protect me in the water from the fierce animals that are associates of the demigod Varuna. By expanding His illusory energy, the Lord assumed the form of the dwarf Vamana. May Vamana protect me on the land. Since the gigantic form of the Lord, Visvarupa, conquers the three worlds, may He protect me in the sky.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
This mantra seeks the protection of the Supreme Personality of Godhead in the water, land and sky in His incarnations as the fish, Vamanadeva and the Visvarupa.