摘要：

The aims of this research is to understand marine biota in the utilization of calcium carbonate (CaCO 3 ) as the forming of coral reef ecosystem and the interaction of marine biota life in the form of symbiosis like Scleractinia with algae zooxanthellae or Tridacna sp. with Scleractinia with algae. It requires a deep ecological research related to the content of CaCO3 in waterworks, the mechanism of CaCO3 formation. This can be done by analyzing the shell length in the mantle tissue portion from the anterior to posterior Tridacna sp. which is symbiotic with Scleractinia coral. The process of formation of Tridacna sp . which is carried out through the measurements of the shell extending on Tridacna sp . as many as 10 samples symbiotic with Scleractinia and zooxanthellae algae since July - August 2017 obtained value growth of CaCO3 formation ranged from 0,22 cm-0,33 cm, while the daily growth of the number of Scleractinia coral colonies ranged from 10.2 to 1. 29.8 septa. The long growth of Tridacna sp . correlated linearly with scleractinia coral colony growth, meaning that the higher the growth value of coral colon increasingly also the shell length of Tridacna sp . Although CaCO3 is absorbed by Scleractinia and Tridacna sp a little but with the presence of symbiosis greatly affect the absorption of Ca +2 by H2CO3 in the process of coral or shell formation by the presence of symbiosis of algae zooxanthellae with Scleractinia and Tridacna sp .

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