Abstract. – Glass eels were collected during their inshore migration from the Indian Ocean to Cimandiri Estuary, West Java, Indonesia from December 1993 to July 1994. Anguilla bicolor bicolor was dominant (more than 97 %) among the three species present in this estuary, in all samples. The total length at arrival ranged from 52 to 65 mm and increased from December to July. Size at recruitment was negatively correlated with the pigmentation stage. The sagittal microstructure and the increment patterns were examined by scanning electron microscope. Based on the number of daily increments deposited on sagittae, the mean age at estuary arrival was estimated as (mean ± standard error respectively for sagittae): 106.4 ± 11.1 days. The spawning ground of these eels is presumably not far from the estuary. The location is discussed.