Study of fouling organisms at Tuoji Island in the Bohai Channel

From June 1984 to May 1985, monthly and seasonal panel tests of fouling organisms were carried out on rafts at Tuoji Island. Seventy-three species were obtained. The occurring frequencies of the following species are all at least 30%:Ectocarpus confervoides, Polysiphonia urceolata, Tubularia mesembryanthmum, Cfytia edwardsi, Tubulipora pulchra, Celleporella hyalina, Mytilus edulis, Hiatella arctica, Caprella acanthogaster, Corophium crassicome, Jassa cf.falcata and Podocerus cf. inconspicuus. Large or calcareous species are not dominant ones. The wet weight is comparatively light, the yearly wet weight being 9.12 kg m^-2. Attaching seasons of major species are from June to October and no bio-attachment occurs between January and April. Fouling organisms at Tuoji Island differ rather greatly from those in the harbours along the continental coast, showing the charcteristics of fouling organisms in the northern island harbours of China.