Dead zones are low-oxygen areas throughout the world's oceans. These incidences have been studied by oceanographers since the 1970's. They have been increasing ever since the oceanographers started studying them. The dead zones are caused by eutrophication, which is excessive amounts of nutrients in different bodies of water.
This is usually due to the runoff from the land, which causes a voluminous growth of plant life. All these plants need to go through photosynthesis, so they take the air all the fish breathe which causes more death of the animal life in oceans, lakes, and rivers.
Another problem with the low-oxygen levels is the decrease in the fish reproductive organ productivity. It causes problems with the decreased reproductive organs, low egg counts, and lack of spawning.
website: http://www.sciencedaily.com/articles/d/dead_zone_(ecology).htm
picture: http://new.coolclassroom.org/files/discoveries/3/dead-zones_fish.jpg
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