From Haaretz.com: How did fish reach Jerusalem?.

Jerusalem’s ancient water system, which excavations over the past decade are gradually uncovering, included a large pool hewn into rock. The pool, next to the Gihon Spring in the City of David, ceased to be used and dried up in the late eighth century B.C.E., after King Hezekiah of Judah built a new water project in the city, the Siloam tunnel. But according to Prof. Roni Reich, of the University of Haifa’s Archaeology Department, and Eli Shukrun of the Israel Antiquities Authority (IAA), who are overseeing the excavations at the site, the pool hewn into the rock did not remain desolate for long: Toward the end of the eighth century B.C.E., a Jerusalem resident decided to build himself a house inside it, thus sparing himself a lot of work, since the pool’s four hewn walls served as a base for the external walls of his home.

Apparently, the new homeowners did not want to [continue]