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<p>We installed commercially available observation devices with communication functions, such as weather meters, weather cameras, and water temperature buoys, on an oyster farm in the Merbok River Estuary and established a real-time monitoring system in the farm environment using the internet. Additionally, we observed changes in water temperature and salinity at a depth of 1&#xa0;m, where oysters are mainly cultivated, using a self-recording water temperature and salinity meter and periodically performed vertical measurements using a throw-in water quality meter during the 2024 monsoon season (October-November). Data analyses, including correlation matrix analysis, indicated a strong correlation between the surface water temperature obtained from the water temperature buoy and the changes in salinity at a depth of 1&#xa0;m obtained from the self-recording salinity meter. Further, the surface water temperature decreased with decreasing salinity. Generally, to obtain appropriate salinity data in a mangrove estuary, the sensor unit needs to be cleaned at least once a week; however, these results suggest that the decrease in salinity in the oyster hanging layer could be detected from the changes in surface water temperature observed by the water temperature buoy, which can be monitored on the network without relying on a self-recording salinity meter. These findings are expected to contribute to improved management of oyster farming environments and provide a scientific basis for decision-making regarding the relocation of farming sites in response to environmental changes.</p>

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Observation of the Freshwater Inflow Event Using IoT Devices at an Oyster Farm in the Merbok Estuary During Monsoon

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月9日

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  • Tatsuya Yurimoto,
  • Faizul Mohd Kassim,
  • Masazurah Abdul Rahim

摘要

We installed commercially available observation devices with communication functions, such as weather meters, weather cameras, and water temperature buoys, on an oyster farm in the Merbok River Estuary and established a real-time monitoring system in the farm environment using the internet. Additionally, we observed changes in water temperature and salinity at a depth of 1 m, where oysters are mainly cultivated, using a self-recording water temperature and salinity meter and periodically performed vertical measurements using a throw-in water quality meter during the 2024 monsoon season (October-November). Data analyses, including correlation matrix analysis, indicated a strong correlation between the surface water temperature obtained from the water temperature buoy and the changes in salinity at a depth of 1 m obtained from the self-recording salinity meter. Further, the surface water temperature decreased with decreasing salinity. Generally, to obtain appropriate salinity data in a mangrove estuary, the sensor unit needs to be cleaned at least once a week; however, these results suggest that the decrease in salinity in the oyster hanging layer could be detected from the changes in surface water temperature observed by the water temperature buoy, which can be monitored on the network without relying on a self-recording salinity meter. These findings are expected to contribute to improved management of oyster farming environments and provide a scientific basis for decision-making regarding the relocation of farming sites in response to environmental changes.