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The shell of an oyster; A product made from the shell of the oyster, such as calcium supplements for humans or laying hens; Oystershell scale, a type of insect; Oystershell NV, a technology company in over-the-counter medicinal products
It is usually made from calcium-high materials; the calcium helps the bird in egg shell production. Soluble grit can be made from limestone or coarsely ground or broken seashells, like oyster or mussel shells; this kind of grit is also called shell grit. [1] Other uses for shell grit include protecting plants from slugs or snails [2] and for ...
Established in 1979 in Flanders, Belgium, Oystershell was originally a miller of oyster calcium carbonate for laying hens. In the 1980s it gradually evolved from this agricultural background to veterinary medicines. Since a management buy-out in 2002 it is owned by the current management and the biotech investor Rudi Mariën.
Because seashells are in some areas a readily available bulk source of calcium carbonate, shells such as oyster shells are sometimes used as soil conditioners in horticulture. The shells are broken or ground into small pieces in order to have the desired effect of raising the pH and increasing the calcium content in the soil.
[citation needed] Open oysters should be tapped on the shell; a live oyster will close up and is safe to eat. [citation needed] Oysters which are open and unresponsive are dead and must be discarded. Some dead oysters, or oyster shells which are full of sand, may be closed. These make a distinctive noise when tapped, and are known as "clackers".
Some dietitians recommend that these be supplied from foods in which they occur naturally, or at least as complex compounds, or sometimes even from natural inorganic sources (such as calcium carbonate from ground oyster shells). Some are absorbed much more readily in the ionic forms found in such sources.