The word Fish Gate was mentioned in Nehemiah, and few other verses in the Bible.
Nehemiah 3:3 says:
And the Fish Gate the sons of Hassenaah built; they laid its beams and set up its doors, its bolts, and its bars.
Historically, the Fish Gate was a place of trades for the fishermen of Galilee; they often gathered there. They bring their fishes through the gate, to be sold.
Simply put, the Fish Gate is a gate of the fishes (the fishes scripturally means the lost souls, the unsaved, the gentiles). Remember the word of Jesus, “Come unto me, and I will make you fishers of men”. A fisher literally catches fishes, and here is Jesus saying he will make you fishers of men (fishes).
Thanks for reading!