Aeration is Part of the Answer
BioWorld Algae Control Technology and Aeration in some
Circulation and aeration has shown to be effective in
controlling algae. Here's how:
Unmixed surface waters, when warmed by the sun, will become
more buoyant and tend to remain at the surface. The excess
sunlight causes algae close to the surface grow and
reproduce. Then, a limiting nutrient, often carbon, becomes
Within a short time, this water becomes warm, nutrient
deficient, high pH (10-11) and receives excess sunlight.
Photosynthesis halts, and the cells either settle down a
layer, causing murky water throughout, or collect at the
surface, resulting in an unsightly bloom.
To prevent this, it must be stopped at the growth stage.
Adequate mixing will prevent thermal statification and
excess surface heating.
On report (WPCF Journal June, 1988) states that "the
likelihood of a blue-green algal bloom was related to water
temperature (<21º C) and ratio of nitrate-nitrogen to total
Nutrient control through aeration is also possible. Nitrogen
and phosphate reductions have been demonstrated using
aeration and circulation.
Consumption by daphnia and fresh water shrimp will control
algae by natural predation. Through aeration and
circulation, an environment is created in which these
aquatic organisms flourish and are able to consume algae.
Aeration and circulation provide an increased dissolved
oxygen level. This is necessary for fish survival and a more
unified distribution of oxygen. In deeper ponds, circulation
can decrease the overall temperature of the pond resulting
in a more widespread comfort zone. Geiger (1983)¹ found that
improved circulation can lead to increased photoplankton and
heterotrophic production which is necessary for fish growth
Murky Water & Sediment Build-Up
Often murky water conditions are a result of the presence of
algae. (See Algae Control on how to prevent this situation.)
Turbid water caused by floating plant and animal matter will
be decreased because these particles will settle more
quickly in cooler water than in warmer water.
Aeration has been found to increase the degradation of
organic materials which accumulate at the bottom of the
pond. Therefore, dredging the pond of this organic matter
can be eliminated
The prolonged use of chemicals has several detrimental
effects. These include killing useful bacteria, fresh water
shrimp, daphnia, microorganisms and all plant and animal
matter. Due to accelerated destruction of plant and animal
matter from chemical use, the build-up of organic matter on
the bottom of the pond ends up in an anaerobic and odorous
state. When used, what is developed is a "Dead Pond". This
situation whether due to chemicals, stagnation or oxygen
depletion can easily be avoided by circulating and aerating.
It will take some time for the natural cycle to begin again;
the length of time depends on the conditions.
¹ Geiger, J.G. (1983),
"Review of pond zooplankton production and the culture of
latval and fingerling striped bass." AQUACULTURE 35:
Algae Treatment is the natural approach to resolving these
complex issues. Aeration may help in some cases.
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