"Six Shofar blasts would be sounded on Erev Shabbat...
after the third blast, they would wait enough time for a small fish to be roasted"
(-Talmud Bavli, Shabbos 35b)
"Nowadays, the minhag in Jewish communities is that half an hour before the time of mincha, the shamash announces that everyone should prepare their fish; this is in place of the Shofar blast..."
(-Shulchan Aruch, Orach Chaim 256-commentary of the Bach)
GUEST POST BY: Judah ben Herring Maven, The Levite Shlepper