<；P>；PROBLEM TO BE SOLVED: To provide a method for surely protecting the adhesion of marine organisms such as corn barnacle, Mytilus coruscus, Hydoroides elegans, sticky ascidian, or composite ascidian to the shell surface of Atrina pectinata japonica which is an edible shellfish, and to provide a preventing device used therefor. <；P>；SOLUTION: A water-passing raw material having a preliminarily imparted anti-fouling effect adheres to the shell of a shellfish and used, thereby (1) "inhibiting a suitable adhesion flow velocity" on the adhesion of suspended corn barnacle larvae to an adhesion substrate in an adhesive time, (2) inhibiting the formation of microorganism film on the surface of shell used as an adhesion substrate to "inhibit adhesion palatability" derived from proteins of corn barnacle, Mytilus coruscus, Hydoroides elegans, and the like, and (3) protecting sticky ascidian or composite ascidian liking smoothness from "rough shape". <；P>；COPYRIGHT: (C)2010,JPO&INPIT
