As Moses and the Children of Israel were crossing through the parted Red Sea, Moses heard cries about how thirsty they were after walking so far. Unfortunately, the water was salty and not drinkable. Miraculously, a fish appeared from the wall of water and told Moses that she and her family heard the pleas of the people. The fish said to Moses that she and her family would remove the salt from the water by passing it through their gills and forcing it out of their mouths. The water would be fresh like a fountain from which the Israelites could drink as they walked by. Moses accepted this kindly offer. To remember the miracle of the fish who transformed salt water to fresh water, Moses let it be known that hence forth the Passover Sedar to honor the Exodus would always include "Gill Filter Fish".