Shellfish Farms - Shellfish proves a reservoir of infectious hepatitis and therefore determination of faecal contamination is important in shellfish beds. Shell fishing is approved in waters with coliform counts below 70 per 100 ml.
Shell fishing is completely stopped, if the coliform counts exceeds 2300 per 100ml. which indicates a gross faecal contamination. Between these two limits shell fishing is allowed if it can be demonstrated that the high count is not of faecal origin, for example from agricultural wastes.
