1.   Algae can block light and deplete oxygen from the water.

2.   As the oxygen is depleted, fish are threatened, algae flourishes, water quality suffers and the chemical reactions in decomposing organic matter are altered.

3.   Algae blooms often kill other marine life by depleting oxygen in the water or producing toxic chemicals.

4.   But excessive algae in the water can deplete oxygen, which can cause fish kills.

5.   Oxygen is depleted, so fish die.

6.   Researchers say the runoff fuels algae blooms that eventually die and decompose, depleting oxygen in the water and leaving vast areas in which marine life cannot survive.

7.   Some officials have said oxygen would be depleted as soon as Friday.

8.   The increased algae growth, in turn, depletes oxygen from the water, causing other marine life to suffer.

9.   The new hordes of blue-green algae deplete the oxygen and are a less favorable food supply.

10.   The nutrients deplete oxygen, kill fish in rivers and streams and render drinking water foul and even dangerous.