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<p>Pegametan Bay, Bali (covering approximately 67 hectares), has been developed as a maricultural site in Indonesia since 2000. However, the water quality in this bay has gradually declined as a result of floating net cages aquaculture activity. This study aims to estimate the bay’s carrying capacity—defined as the maximum fish production without causing environmental degradation—during two contrasting seasonal conditions: June 2019 (dry season) and March 2021 (wet season). Carrying capacity in aquaculture is typically assessed by quantifying the nutrient load that can be processed by the environment while maintaining water quality standards. Field sampling was conducted in both periods, measuring phosphorus concentrations (using the stannous chloride method) and water current speed (using a Valeport Model 106 current meter). Phosphorus was selected as the key indicator because it is a limiting nutrient that strongly influences primary productivity and eutrophication. The estimated carrying capacities were 25.353 tons/year in June 2019, obtained from current speeds ranging from 0 to 0.143&#xa0;m/s, and 5,722.311 tons/year in March 2021, obtained from current speeds ranging from 0 to 0.212&#xa0;m/s. This significant difference reflects seasonal hydrodynamic changes, particularly increased water flushing during the wet season, as well as a reduction in aquaculture activity during that period, both contributing to lower observed phosphorus concentrations. These findings show that carrying capacity is highly seasonal and underline the importance of integrating environmental data into mariculture planning. This study helps develop adaptive strategies for sustainable marine resource management in changing environments.</p>

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Carrying Capacity Estimation of Pegametan Bay, North Bali, Indonesia for Fish Production in Floating Net Cages during the Dry and Wet Seasons

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Zahra Akbari Ariadji,
  • Gede Suantika,
  • Pingkan Aditiawati

摘要

Pegametan Bay, Bali (covering approximately 67 hectares), has been developed as a maricultural site in Indonesia since 2000. However, the water quality in this bay has gradually declined as a result of floating net cages aquaculture activity. This study aims to estimate the bay’s carrying capacity—defined as the maximum fish production without causing environmental degradation—during two contrasting seasonal conditions: June 2019 (dry season) and March 2021 (wet season). Carrying capacity in aquaculture is typically assessed by quantifying the nutrient load that can be processed by the environment while maintaining water quality standards. Field sampling was conducted in both periods, measuring phosphorus concentrations (using the stannous chloride method) and water current speed (using a Valeport Model 106 current meter). Phosphorus was selected as the key indicator because it is a limiting nutrient that strongly influences primary productivity and eutrophication. The estimated carrying capacities were 25.353 tons/year in June 2019, obtained from current speeds ranging from 0 to 0.143 m/s, and 5,722.311 tons/year in March 2021, obtained from current speeds ranging from 0 to 0.212 m/s. This significant difference reflects seasonal hydrodynamic changes, particularly increased water flushing during the wet season, as well as a reduction in aquaculture activity during that period, both contributing to lower observed phosphorus concentrations. These findings show that carrying capacity is highly seasonal and underline the importance of integrating environmental data into mariculture planning. This study helps develop adaptive strategies for sustainable marine resource management in changing environments.