In the Ancient Hawaiian aquaculture, fishponds were located next to the mouth of a stream and had porous lava walls that let in seawater (or sometimes fresh or brackish water, as in the case of the "Menehune" fishpond, a historic Hawaiian fishpond listed on the U.S. National Register of Historic Places, near Līhuʻe, Kauaʻi), but prevent the fish from escaping.
In the Ancient Hawaiian aquaculture, fishponds were located next to the mouth of a stream and had porous lava walls that let in seawater (or sometimes fresh or brackish water, as in the case of the "Menehune" fishpond, a historic Hawaiian fishpond listed on the U.S. National Register of Historic Places, near Līhuʻe, Kauaʻi), but prevent the fish from escaping.