153 Fish
Count back 153 verses from the end of the book of Revelation and you will arrive at (15:3) the song of Moses and the Lamb:
Revelation 15:3 KJV And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
Then you will understand the 153 Fishes.