shellfishn.贝；甲壳类动物；贝类菜shellfish collection贝类采集shellfish environment贝类环境shellfish cultivation贝类养殖shellfish and molluscs介贝和软体海产shellfish culture area贝介类养殖区shellfish culture areas贝类养殖区shellfish contamination贝类沾污Shellfish polysaccharide贝类多糖Shellfish and crustacean贝（甲）壳类海产品shellfish harvesting area贝介类养殖区；贝介类生产区