Cod is a batch spawner, spawning 10-20 batches during a 2-3 month period in December – June (dependent on stock). Egg size is around 1.4 mm and fecundity accordingly high (500 000–1 000 000 eggs per kg female weight for farmed cod). The eggs are planktonic and hatch after approximately two weeks (5 °C, 70 day-degrees).