Algal "blooms" happen naturally in rivers and at sea 
http://en.wikipedia.org/wiki/Algal_bloom  often near estuarine areas which 
discharge agricultural nitrogenous leachate and nitrate and phosphate rich 
substances from such products as detergents and clothes washing powder. 
Biochemical oxygen demand of the explosive growth can suffocate other life in 
the area - just bubbling the atmosphere through the areas ought to increase 
yield a lot. 

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