Shellfish-macroalgae IMTA maintaining water environment stability: A case study of Crassostrea gigas and Gracilaria lemaneiformis IMTA in Sanggou Bay of China
文献类型： 外文期刊
作者： Tong, Ruixue 1 ; Zhang, Rong 1 ; Fang, Jinghui 1 ; Zhang, Yitao 3 ; Xu, Jialei 4 ; Zhang, Xiaowen 1 ; Xie, Yumeng 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, State Key Lab Mariculture Biobreeding & Sustainabl, Qingdao 266071, Peoples R China
2.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai 201306, Peoples R China
3.Rongcheng Chudao Aquat Prod Co Ltd, Weihai 264300, Peoples R China
4.Shunwei Ocean Technol Shandong Co Ltd, Dongying 257236, Peoples R China
5.Shandong Tonghe Ocean Technol Co Ltd, Dongying 257236, Peoples R China
关键词： Bioremediation; Integrated multi-trophic aquaculture; Nutrients; Inorganic carbon system; Plankton
期刊名称：MARINE POLLUTION BULLETIN （ 影响因子：4.9； 五年影响因子：5.6 ）
ISSN： 0025-326X
年卷期： 2025 年 216 卷
页码：
收录情况： SCI
摘要： Shellfish and macroalgae are usually known as environmental remediation species in aquaculture systems. However, the environmental issues are frequently found in shellfish and macroalgae large scale monoculture areas. Although shellfish and macroalgae IMTA might mitigate adverse effects of monoculture, the relationships among cultured organisms, plankton and environmental factors are unclear. This study evaluated the ecological impacts of Crassostrea gigas and Gracilaria lemaneiformis monoculture versus integrated multi-trophic aquaculture (IMTA) systems in Sanggou Bay, China, through a 5-day in-situ enclosure experiment. We assessed the nutrient levels, inorganic carbon system, plankton abundance, and Chl-a concentration under different aquaculture modes. Results revealed that oyster monoculture increased PO43--P levels, DIN concentrations and elevated COQ levels, exacerbating acidification risks. In contrast, IMTA systems with oyster-to-macroalgae ratios of 1:1 and 4:2 reduced PO43--P levels by 75 %, optimized DIN removal, and mitigated COQ accumulation. Moreover, oyster monoculture promoted pico-phytoplankton dominance by suppressing competitors (micro-/nano-phytoplankton) and predators (zooplankton), a trend reversed in IMTA systems where macroalgae limited picophytoplankton proliferation. Besides, Chl-a declined across all treatments. The in-situ enclosure experiment provided realistic insights into species-environment interactions, overcoming laboratory limitations of oversimplified systems. These findings underscore that IMTA ratios of 1:1 and 4:2 enhance nutrient cycling, stabilize carbonate system, and reduce eutrophication risks. This study advances sustainable aquaculture practices by demonstrating how optimized species ratios balance productivity and environmental health, offering actionable strategies for coastal management to mitigate ecological degradation in semi-enclosed bays.
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