Fish, symbol of rebirth
Antelopes represented nature's chaos. The early Egyptians believed that control over them allowed the creation of world order, so the dead could be reborn. Tilapia fish taking fertilized eggs into their mouths symbolise this rebirth.
Young fish developing in their parents mouth eventually emerged. Such behaviour was associated with sef-generation and later with the mythi of the god Atum, who used his spit to creat the world.