Many areas of the U.S Affiliated Pacific Islands are characterized by large, sheltered, relatively pollution-free lagoons that are perfect for giant clam farming. Even islands that have limited lagoon areas usually have deeper holes and depressions in the reef flat where farming can take place. A typical farm site would be located in 1-5 m of clear ocean water and should be away from point sources of pollution such as dredge sites, garbage dumps, marinas and sewage outfalls. Giant clams prefer full strength seawater and will quickly die if exposed to brackish water or freshwater for long periods. For this reason sites should be located away from freshwater sources such as river mouths.
Light is important for clam growth and only mild water cloudiness can be tolerated.
Life cycle of the giant clam. A good water exchange rate is important for bringing fresh nutrients to the clams but this must be balanced against providing adequate shelter for the clams during storms. Ideal sites are those that are close to reef islands or located on the back side of the barrier reef in sand or coral rubble areas. These sites provide some protection from wave action but also have a good water exchange. Depth is also an important factor to consider when placing a farm site.