Crabs are sometimes observed to amass on shore to escape pockets of oxygen-poor water, a behavior known as a "crab jubilee".

By contrast, the Titanic wreck, in deep, cold, oxygen-poor water, is deteriorating much more slowly.

Some fishes actually do better in oxygen-poor water, while others prefer oxygen-rich water.

This action, the scientists wrote in Nature, probably serves to aerate the eggs in the canyon's oxygen-poor waters.

This organ is a vital innovation for fishes that often inhabit warm, shallow, oxygen-poor water.

Jellyfish are better able to survive in nutrient-rich, oxygen-poor water than competitors, and thus can feast on plankton without competition.

This would allow them to live in oxygen-poor water or pursue small prey in shallow water.

The gills push the oxygen-poor water out through openings in the sides of the pharynx.

The Dikume eats mosquito larvae and has high levels of blood haemoglobin, an adaptation to oxygen-poor deep water.

So this seasonal rise in production of the gas - off India and possibly in similar oxygen-poor waters - may affect global warming.