Abstract: After the two basic shellfish survey in the mangrove in 2002 and 2005,the third quantitative and qualitative survey of the shellfish resources of Zhanjiang Gaoqiao mangrove areas was carried out in the same sample point in July 2006.The four sampling stations were Xicun,Dongcun,Hongkan and Changtian in Gaoqiao mangrove.The survey results showed that the shellfish species components in Gaoqiao mangrove included 3 classes,6 subclasses,11 orders,26 families and 60 species belonging to 43 genera.Among those,nine species belonged to Tellinidae;there were five species in the families of Ostreidae and Veneridae respectively;four species in each family of Arcidae,Mytilidae and Nassariidae;there were less than three species in each of the other families.Compared with the two previous survy results,there had been a marked downward trend in shellfish density and biomass.Therefore,it is necessary to take a multi-faceted protection measures,so that the shellfish resources and biodiversity in Zhanjiang mangrove can be in sustainable development and use.

Key words: Zhanjiang Gaoqiao, Mangroves, Shellfish, Diversity, Resources