Modes of fish reproduction. Each embryo develops in its own egg in female’s body until hatch. Embryos depend on their yolks . Egg layers - examples. Egg retainers. Ovoviviparous. Substrate spawners Prawn carrying . eggs. Mouth brooders Oviparous. Majority of fish. Live bearers. Viviparous. mother retains the eggs and nourishes the embryos