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Pond Algae



Pond algae in ponds that are primarily fish ponds is a slightly different kettle of fish (if you’ll excuse the wordplay) than algae control in an ecologically balanced water garden.

The main difference is that in a water garden enough plants are installed to create a balanced water quality and the fish are part of that equation.

Excess fish are removed to maintain the balance and maintain the plant quality and quantity.

Fish Pond Algae


In a fish pond, the point of the pond is to have as many fish as the pond will accommodate and plants take a backseat. With high fish populations, plants are under pressure from nibbling fish and plant lifespan can be sometimes measure in minutes rather than months. Also high fish populations add significant fish excretion and nutrients to the pond that lowered plant populations can not absorb.

The result is green water (floating algae).

In this case, one of the best solutions for fish enthusiasts is resorting to UV light sterilization of the water.

Barley Straw


Barley straw will help to combat algae when fish populations are not excessively high.

While I personally don’t like using pond chemicals, it is quite possible to dose a pond with one of the algae killing chemicals on the market. Most of these are based on atrazine - a popular corn herbicide. I personally prefer the mechanical methods for fish pond pond algae control as they are more efficient and ecologically sensitive.

String Algae


The other algae that is a bit of a problem in fish ponds (particularly if there is a little too much food going into the fish pond) is string algae. The solution to this is to reduce the feeding and simply twirl the algae around a stick to remove it in clumps.








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