Abstract

Fraction of tidal flat at both sides of Bach Dang estuary is the fine sand –silt shape which is created by the interaction between river and tidal currents. Plentifully nutrient resources are discharged from continent brought to the estuary by medium-speed tide contribute to advantage condition for growth of hard clam. With the unique characteristics of hydro chemical  and current,  process of hard clam (Meretrix lyrata) hatchery have different properties in compare with other areas such as size of seed hard clam, period of growth, point of beginner. The rule of development of the hard clam is formulated as y (months old) = , with H height (cm). It means that their stages of development were strongly affected by local environmental variables.

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