haimo niyuta-yojanaḥ

sah-the Lord; anudhyatah-being meditated upon; tatah-thereafter (hearing the words of the saintly brahmanas); rajna-by the King; pradurasit-appeared (before him); maha-arnave-in the great ocean of inundation; eka-srṅga-dharah-with one horn; matsyah-a big fish; haimah-made of gold; niyuta-yojanah-eight million miles long.