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Of all the water quality parameters which affect fish, ammonia is the most important after oxygen, especially in intensive systems. Ammonia is a colorless, odorless substance and is a major metabolic waste product from fish; this can accumulate in aquaculture systems and cause direct mortalities, a decrease in production, and increased incidence of many diseases.

In small amounts, ammonia causes stress and gill damage. Fish exposed to low levels of ammonia over time are more susceptible to bacterial infections, have poor growth and will not tolerate routine handling as well as they should. Ammonia is a killer when present in higher concentrations, and many unexplained production losses have been caused by ammonia.

Ammonia is excreted across the gill membranes and in the urine. The primary source of ammonia in aquaculture systems is fish feed. When feed is eaten by fish it is metabolized into the energy, nutrients, and proteins used for survival and growth. As with all animals, there is waste produced by these normal metabolic processes. Ammonia is the principal waste product excreted by fish.

In water, ammonia occurs in two forms, which together are called the Total Ammonia Nitrogen, or TAN. Chemically, these two forms are represented as NH4+ and NH3. NH4+ is called Ionized Ammonia because it has a positive electrical charge and NH3 is called Unionized Ammonia since it has no charge. This is important to know, since NH3, unionized ammonia (abbreviated as UIA), is the form which is toxic to fish even at a concentration as low as 0.5 ppm at a pH above 8.3. so, it is essential and economically beneficial to maintain ammonia below this level by undertaking regular maintenance of the pond than by applying NH-CONTROL than treating them in crisis.

Adjunct to ammonia is Nitrite which is a sister of ammonia but dangerous than ammonia, it is toxic irrespective of pH of the pond even at a low concentration of 0.2 ppm.

So,it is essential and economically benefecial to maintain ammonia always below the toxic levels to avoid production losses and mortality.

Periodic treatment of fish pond with NH-CONTROL implants the deammonifying bacteria into the fish pond, these are natural bacteria carefully selected to consume ammonia and nitrite into nontoxic byproducts.

Here comes NH CONTROL to keep ammonia always below the problematic toxic levels.The Deammonfying bacteria in NH CONTROL makes use of this exccess ammonia and nitrite and convert them into Non toxic byproducts.This process helps to keep the ammonia levels LOW.

  • Live Microbial Culture.

1 Kg per Acre of pond,preferably daytime


Immerse in pond water for not more than 2 hours and use immediately.Use once in every 10 days to maintain optimum ammonia levels.


As 1 Kg pouches.

Text to table.

The above table sshows Fraction of Unionized ammonia in aqeous solution at different pH values and temperatures.Calculated from data in Emmerson et al.(1975).To calculate the amount of unionized ammonia present,the Total Ammonia Nitrogen (TAN) must be multiplied by the factor selected from this table using pH and temperature from your water sample.

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