Data on the availability of different sizes of fruits, seed production according to size classes, germination success and viability of  seeds of Sonneratia apetala Buah—Ham. were collected during 1984—85 from the Chittagong coastal area. The fruit dropping period extended from late July to early October. Fruit size varied and proportion of medium sized fruits was h:gh. No significant difference in germination success was detected when seeds from different fruit size classes were collected and sown. Viability of seeds declined with passage of time in the laboratory as well as under field conditions. No seed germinated in the field when sown after 60 days of fruit collection.