He identified the need for the oil industry to minimise the dissolved oxygen content of water reinjected into oilfields, and thus reduce its corrosiveness.

They will find trickling flows, low dissolved oxygen levels, stressed fish and choking growths of algae that on some waters will make fishing all but impossible.

Cooler water holds more dissolved oxygen than warmer water.

This can change a lake's natural food web, and also reduce the amount of dissolved oxygen in the water for organisms to breathe.

Aerobic decomposition of this material can reduce dissolved oxygen levels if discharged into rivers or waterways.