1.   Sulphide ores tend to oxidise in aerobic conditions, consuming oxygen and releasing carbon dioxide.

2.   And high-activity fish like sea bass and salmon consume their oxygen too quickly to survive the long transport.

3.   Bacteria consume oxygen as they decompose sewage and other organic matter.

4.   Bacteria fed on the waste and consumed so much oxygen that none was left for other species in many parts of the river.

5.   Both consume oxygen when they get into aquatic ecosystems.

6.   Surface bacteria had less food, their population shrank and they consumed less oxygen.

7.   Worse still, the phosphorus will trigger the growth of plankton, which will, in turn, consume more oxygen and allow even more phosphorus to escape.

8.   Algae blooms can also cause it when single-cell plants die and sink to the ocean floor, consuming oxygen.

9.   And algae blooms may cause hypoxia, which is when single-cell plants die and sink to the ocean floor, consuming oxygen.

10.   This species of bacteria uses ammonia as a sole energy source for its own survival and being aerobic, also consumes oxygen for respiration.