Harvest of finfish (by hook-and-line only) and clams are allowed within the conservation area only. Clams may only be taken on the north shore of the slough in the area adjacent to the Moss Landing State Wildlife Area. The California Office of Environmental Health Hazard Assessment has issued a safe advisory for any fish caught in Elkhorn Slough due to elevated levels of mercury and PCBs. In addition, there is a notice of "DO NOT EAT" for leopard sharks and bat rays for women 18-45 years old and children 1-17 years old.