Frog Eggs and Algae The Leopard Frog lays large masses of eggs. This egg mass may contain as many as four thousand eggs.
Conditions are very crowded among the thousands of eggs.
Eggs located on the outside of the egg mass have an easier time absorbing oxygen from the surrounding water. Eggs in the middle of the egg mass don't have as good contact with the water. This makes taking oxygen from the water more difficult for for the eggs in the middle of the egg mass. Microscopic algae often grows in the jelly-like coating of each egg. This algae is helpful in providing oxygen.