The male carries the eggs until they hatch several weeks later. At the other end of the spectrum of care is the seahorse. A male seahorse actually becomes pregnant. A female deposits eggs into the male's pouch, where he fertilizes them. Each fertilized egg then embeds into the lining of the pouch.
Tissue grows around each egg and supplies the eggs with oxygen throughout the pregnancy.
Depending on the species of seahorse, the male will carry the eggs for a period of 10 to 30 days.