<;P>;PROBLEM TO BE SOLVED: To provide a method for efficiently collecting the seedlings of a shellfish. <;P>;SOLUTION: This method for collecting the seedlings of a shellfish in an anchored sea basket style is such that a seedling collector is coated with a hydraulic composition containing a cement as a main component and containing a non-hydraulic alkaline earth metal salt in an amount of 40 to 90 mass%. <;P>;COPYRIGHT: (C)2009,JPO&INPIT