Friday, April 23, 2010

dEaD zOnEs

There is a problem that commonly plagues bodies of water called "Dead Zones." These are zones that have no life in them and that is why they are called dead zones. Dead zones can occur due to a slew of reasons. One being eutrophication. This is when there is not enough dissolved oxygen in the water for fish to live. This depletion of oxygen occurs because there are too many nutrients in the water and this causes bacteria to grow out of control and then the bacteria that eats this eats up all the oxygen as well causing fish to die. This is why they are called dead zones is because all the fish die. There are other reasons for these zones of no life. Another being algal blooms. These can be poisonous blooms of an algae that usually occurs because there is a change in temperature or too many nutrients. This can poison the fish and cause them to die. It can also poison humans so it is important to not eat seafood that comes from a poisonous algal bloom.

No comments:

Post a Comment