No, “fish” in Greek is ιχθυς, which was used as an acrostic for Iesous Christos Theou Huios Soter, Jesus Christ, Son of God, savior. I vaguely recall seeing somewhere that during the persecutions, one Christian would draw one line of the two-line symbol as a shibboleth for another to complete to show that they too were Christian.
As far as I can tell from a cursory search, our evidence for ιχθυς dates from II and later, which would indeed put it firmly in a "fisher of men" or "loaves and fishes" interpretation and not an astrological one. Thanks!
