Water Quality for Aquaculture

An evaluation of a potential site for aquaculture should include testing for the following water quality parameters:

Parameter Acceptable range
pH 6.0 - 8.0
Alkalinity (measured as CaCO3) 100 - 400 ppm
Total hardness 100 - 400
Carbon dioxide 0 - 15
Iron (Fe) - ferrous Less than 0.1 ppm
Ammonia (NH3) Less than 0.02 ppm
Nitrate (NO3) 0 - 3.0 ppm
Nitrite (NO2) 0.1 ppm

The prospective aquaculture producer should also contact the West Virginia Department of Agriculture for water tests for:

Pesticide residues
E. coli bacteria

Because potential sites and water sources for aquaculture can differ widely, additional water quality testing may be required if the results of the above tests are within acceptable ranges. The standards listed above are only the very basic parameters needed to keep fish alive and healthy. Other recommended tests can include screening for heavy metals, organochlorine compounds, hydrogen sulfide, nitrogen gas and other contaminants depending on the nature of the individual site and water source. These tests are generally very expensive and should be conducted only if recommended after other aquaculture site evaluation criteria have been met successfully. For further information on water quality testing for aquaculture or for a listing of approved water quality testing laboratories, contact your local Extension office.

Written by: Agnes V. Spicer, West Virginia University Extension, Aquaculture Specialist. 1997