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<p>This investigation evaluated the comparative efficacy and environmental consequences of microecological versus chemical intervention strategies for macroalgal control in spiny cucumber (<i>Apostichopus japonicus</i>) aquaculture systems during high-temperature periods. Controlled field experiments were established in Zhuanghe, Dalian, employing four commercial-scale ponds (120 mu each) with systematic application of <i>Bacillus subtilis</i> (microecological treatment) and <i>chlorine dioxide</i> (chemical treatment), followed by comprehensive assessment of eleven physicochemical parameters including total nitrogen, total phosphorus, orthophosphate, ammonia nitrogen, and pH across designated temporal intervals. Molecular characterization through ITS sequencing (see Table&#xa0;1) confirmed <i>Ulva prolifera</i> as the predominant bloom-forming species throughout all experimental systems. Statistical analysis revealed significant treatment effects on nutrient dynamics, with chemical interventions producing significantly higher phosphorus concentrations (orthophosphate, 0.59&#xa0;mg/L; total phosphorus, 0.80–1.02&#xa0;mg/L) compared to microecological treatments (orthophosphate, 0.40&#xa0;mg/L) on sampling days 5 and 10, while microecological systems demonstrated significantly elevated ammonia nitrogen concentrations (0.039&#xa0;mg/L versus 0.011&#xa0;mg/L in chemical treatments) that facilitate benthic diatom proliferation. Multivariate statistical analysis indicated significantly enhanced aquatic ecosystem stability in microecologically treated systems, reflecting diminished environmental perturbation and superior biogeochemical buffering capacity. The research establishes that microecological interventions achieve effective algal suppression while producing significantly reduced secondary contamination and enhanced ecological integrity preservation, thereby providing empirical foundation for environmentally sustainable macroalgal management protocols in commercial sea cucumber aquaculture operations.</p>

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Study on the effects of microecological and chemical agents on the water quality of spiny ginseng aquaculture ponds

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Chongyu Zhu,
  • Zhijian Yin,
  • Yuwei Zhang,
  • Jianlong Liu,
  • Yuting Cong,
  • Li Wang,
  • Yuan Wang,
  • Jing Gu,
  • Yanan Lu,
  • Lianshun Wang,
  • Guojun Yang,
  • Hua Wang

摘要

This investigation evaluated the comparative efficacy and environmental consequences of microecological versus chemical intervention strategies for macroalgal control in spiny cucumber (Apostichopus japonicus) aquaculture systems during high-temperature periods. Controlled field experiments were established in Zhuanghe, Dalian, employing four commercial-scale ponds (120 mu each) with systematic application of Bacillus subtilis (microecological treatment) and chlorine dioxide (chemical treatment), followed by comprehensive assessment of eleven physicochemical parameters including total nitrogen, total phosphorus, orthophosphate, ammonia nitrogen, and pH across designated temporal intervals. Molecular characterization through ITS sequencing (see Table 1) confirmed Ulva prolifera as the predominant bloom-forming species throughout all experimental systems. Statistical analysis revealed significant treatment effects on nutrient dynamics, with chemical interventions producing significantly higher phosphorus concentrations (orthophosphate, 0.59 mg/L; total phosphorus, 0.80–1.02 mg/L) compared to microecological treatments (orthophosphate, 0.40 mg/L) on sampling days 5 and 10, while microecological systems demonstrated significantly elevated ammonia nitrogen concentrations (0.039 mg/L versus 0.011 mg/L in chemical treatments) that facilitate benthic diatom proliferation. Multivariate statistical analysis indicated significantly enhanced aquatic ecosystem stability in microecologically treated systems, reflecting diminished environmental perturbation and superior biogeochemical buffering capacity. The research establishes that microecological interventions achieve effective algal suppression while producing significantly reduced secondary contamination and enhanced ecological integrity preservation, thereby providing empirical foundation for environmentally sustainable macroalgal management protocols in commercial sea cucumber aquaculture operations.