Salt-water fish and mollusks are the species that humans take from the wild in the greatest numbers, and it is particularly hard to protect species that have long been used by man.
尤其海洋魚類與軟體動物是人類目前由野外採收最大量的物種，針對被長期利用的物種欲加以保護，要克服的更不只是生態知識欠缺的問題。