ABSTRACT Bamboo clam (Solen lamarckii) is a type of mollusck of the Solenidae family known as “sepahat” by the people around Bengkalis. This study was conducted at Api-Api village waters, Bengkalis Regency in January 2020. This study aims to investigate the fecundity produced by each female of bamboo clam and egg diameter in each phase of maturity gonad stage. This study used survey m…