Carbon dioxide should be measured when first using a new groundwater source and routinely in recirculating systems. When hydrogen sulfide and carbon dioxide problems are likely, systems should be monitored closely and the means to correct problems should be readily available. At lower stocking densities, water quality parameters can be monitored less frequently or not at all. Regardless of the frequency, monitoring should be conducted at a standard time and depth where fish are located. Conversely, temperature and pH in ponds are best measured during the late afternoon.
Several suppliers produce kits and materials to monitor water quality.
Suppliers frequently have displays at trade shows and sources are listed in several trade journals including the Annual Buyer's Guide published by Aquaculture Magazine, P.O. Box 2329, Ashville, NC 28802. References Anonymous, 1991. Proceedings Aquaculture Symposium, Engineering Aspects of Intensive Aquaculture. Cornell University Press. Standard Methods for the Examination of Water and Wastewater.