Main Fouling Organisms Attaching to Net Cage & Their Seasonal Change in Zhejiang Sea Areas

A quantitative and qualitative biological determination of the main fou ling organisms attaching to net pieces was carried out in Fodu,Xi angshan and Dachen water areas durin g the period from April to December2002.The results showed that the main fouling organisms in the three testing areas were hydra(including Obelia sp,Eudendrium capillare,Gonothyrea sp and etc.),Actiniaria,Caprellidae,Gammarid,Barnacle,Mussel,Oys-ter,sea ageal and benthic diatom;am ong which hydra and Actiniaria cause d bigger problems.In addition,the seasonal change and its rule of the ma in fouling organisms were presented.