SB 8.24.25
evam vimohitas tena
vadata valgu-bharatim
tam aha ko bhavan asman
matsya-rupena mohayan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
After hearing these sweet words from the Supreme Personality of Godhead in the form of a fish, the King, being bewildered, asked Him: Who are You, sir? You simply bewilder us.