tuṣṭāva madhusūdanam

nibadhya-anchoring; navam-the boat; tat-srṅge-onto the horn of the big fish; yatha-uktah-as advised; harina-by the Supreme Personality of Godhead; pura-before; varatrena-used as a rope; ahina-by the great serpent (of the name Vasuki); tustah-being pleased; tustava-he satisfied; madhusudanam-the Supreme Lord, the killer of Madhu.