The study was conducted in Tobea Island and coastal Lambiku for analysis: 1) biology aspects, 2) environmental aspects. Data were analysed to see the difference in the two locations using t-test analysis (student) and descriptive. The analysis showed that mangrove ecosystems in Tobea island, the closure of the (51%) and density (1.000 trees ha-1), in coastal Lambiku close (43%) and density (944 trees ha-1). Biological aspects of the growth population of mudclams in the Tobea Island (L∞= 65.6 mm, K= 1.18) lower than in coastal Lambiku (L∞= 73,75 mm, K= 0.73). Results of the t-test (student), morphometric characters of mudclams in Tobea Island and coastal Lambiku significantly different. The length-weight relationship of mudclams of sex male and female in the Tobea Island and coastal Lambiku positive allometric (b ≠ 3). Relative condition factor and sex ratio of mudclams in Tobea Island, significantly different between male and female in coastal Lambiku. The size of the first measure of mature gonads of mudclams in Tobea Island (average of 39,62 mm ranges of 39,20 - 40,04 mm) is lower than in coastal Lambiku (average of 39,58 mm, range of 39,21 - 39,96 mm). The density of mudclams of the Tobea Island (the highest 48 ind m-2, the lowest of the 21 ind m-2) is greater than coastal Lambiku (the highest 15.67 ind m-2, the lowest 5,67 ind m-2). Bioecologycal aspects of mudclams in Tobea Island affected by organic carbon and phosphate. While in coastal Lambiku affected by nitrogen and sulphur by both the growth and density
