But crabs are more than just fun. Because of a high salt content, few species are suitable for living in eulittoral zones. But because there are many organisms being washed out of the river mouths, the food is plentiful, and the populations of the species that do exist here are always large.
但螃蟹卻不只是好玩而已，在潮間帶，由於鹽份高，適合生存的生物種類不多；但由上游沖刷而下的有機質源源不絕，食物豐富，生存其間的生物往往數量龐大。