It is necessary to catch young scallops deliberately for sustainable business of scallop culture, because quantity of young scallops, which is taken by fishermen, affects to fishery of scallops and scallop culture environment directly. We are studying a simulation method to estimate behavior of young scallops. This paper focuses on setting methodology of spawning period and growth speed of scallop in order to optimize input parameters of the simulation. Field data sets were used to evaluate spawning period and growth speed. Simulation with the spawning period and the growth speed gave reasonable results qualitatively.