Aquaculture Department, Southeast Asian Fisheries Development Center (SEAFDEC/AQD), Buyu-an, Tigbauan, 5021, Iloilo, Philippines.
Marine Pollution and Ecotoxicology Laboratory, Institute of Marine Fisheries and Oceanology, College of Fisheries and Ocean Sciences, University of the Philippines Visayas (UPV), Miag-ao, 5023, Iloilo, Philippines.
Environ Sci Pollut Res Int. 2019 Oct;26(29):29810-29821. doi: 10.1007/s11356-019-06092-z. Epub 2019 Aug 13.
Organic enrichment from aquaculture could alter the chemical composition of the fishpond bottom by increasing the levels of organic matter (OM), sulfur (S), iron (Fe), and lower pH of the sediment. Polychaetes can contribute to the nutrient cycling and remediation of polluted sediment. A laboratory experiment was conducted to test the remediation potential of small and large mud polychaete Marphysa sp. introduced to two types of fishpond sediment. Initially, Sediment A had lower OM, S, Fe, and higher pH than Sediment B. After 30 days, in Sediment B, large polychaetes significantly decreased the OM level (27%) while both small and large polychaetes promoted significant decreases of S (71%) and Fe (70-73%) in both sediment types. The increase of sediment pH was promoted by the presence of polychaetes (0.53-0.69) although pH level in small polychaete was not significantly different with the no polychaete treatment. Regardless of polychaete treatment, the pH level of Sediment B (1.04 ± 0.10) was significantly improved than that of Sediment A (0.17 ± 0.02). In both sediments, large polychaetes (95%) had better survival rates than small polychaetes (73%). These findings reveal that large Marphysa sp. can significantly improve sediment quality by decreasing the levels of OM, S, and Fe and improve pH level to a more basic form without compromising its survival. Large polychaetes are recommended to be used as bioremediators of organically enriched aquaculture pond sediment.
水产养殖的有机物富集会通过增加有机物 (OM)、硫 (S)、铁 (Fe) 的含量和降低沉积物的 pH 值来改变鱼塘底部的化学组成。多毛类环节动物可以促进营养物质的循环和受污染沉积物的修复。进行了一项实验室实验，以测试小型和大型泥多毛类环节动物 Marphysa sp. 引入两种类型鱼塘沉积物的修复潜力。最初，沉积物 A 的 OM、S、Fe 含量较低，pH 值较高。30 天后，在沉积物 B 中，大型多毛类动物显著降低了 OM 水平（27%），而小型和大型多毛类动物都促进了 S（71%）和 Fe（70-73%）在两种沉积物类型中的显著减少。尽管小型多毛类动物的 pH 值与无多毛类动物处理无显著差异，但多毛类动物的存在促进了沉积物 pH 值的增加（0.53-0.69）。无论多毛类动物处理与否，沉积物 B 的 pH 值（1.04 ± 0.10）均显著高于沉积物 A（0.17 ± 0.02）。在两种沉积物中，大型多毛类动物（95%）的存活率均优于小型多毛类动物（73%）。这些发现表明，大型 Marphysa sp. 通过降低 OM、S 和 Fe 的含量并将 pH 值提高到更碱性的形式，可显著改善沉积物质量，而不会影响其存活率。建议使用大型多毛类动物作为富含有机物水产养殖池塘沉积物的生物修复剂。
