2023 Volume 79 Issue 18 Article ID: 23-18008
This field experiment revealed that ark shell Scapharca broughtoniie grew well (increase from 37.8 mm to 62.0-65.6 mm in length in 449 days) in the suspended culture cage where glass bottle cullets (Crystal Stone Sand; CSS) were used as substrate. The CSS discharged from public life in large quantities was thought to be available for the substrate of aquacultures of marine bivalves. In comparison between CSS and Anthracite, no significant difference was observed in shell length at the same depth. In case of the same substrate, the shell length was significantly higher at 3m than 1m depth for Anthracite although there was no significant difference in the shell length among two depths for the CSS. Monitoring of sea environments, especially dissolved oxygen, is crucial for the sustainable cage cultures of clams in the enriched coastal area like Osaka Bay.
