The fate of carbon, nitrogen and phosphorus in freshwater polyculture mesocosms using both nutrient-balance and stable-isotope assessment

IF 3.2 2区农林科学 Q1 FISHERIES

Aquaculture Reports Pub Date : 2025-05-21 DOI:10.1016/j.aqrep.2025.102865

Sarah Nahon , Christophe Jaeger , Christophe Menniti , Philippe Kerherve , Marc Roucaute , Joel Aubin

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引用次数: 0

Abstract

Freshwater polyculture can increase nutrient use by rearing species from different trophic levels. The aim of this study was to quantify nutrient balances and determine the food sources of fish using nitrogen (N) and phosphorus (P) nutrient balances and carbon (δ¹³C) and N (δ¹⁵N) stable isotopes. The contributions of food sources to fish diets were estimated using stable-isotope mixing models. Three treatments were compared in mesocosms: fish-only (F treatment: common carp, roach and largemouth bass), fish-macrophyte (FM treatment) and macrophyte-only (M treatment). Fish were fed with commercial pellets. The results showed that adding macrophytes to the fish did not improve water quality. Chlorophyll-a concentration in F and FM treatments was significantly higher than that in treatment M (8.1, 8.3 and 0.6 µg l⁻¹, respectively). Regardless of the treatment, sediment contained most of the total N and P at harvest (93.5 and 89.7 %, respectively). Carp, roach and bass had a similar specific growth rate in F and FM treatments (1.19, 0.36, 0.94 % day⁻¹, respectively). Carp consumed 90 % commercial feed and 8 % macrobenthic invertebrates, while roach consumed 50 % commercial feed and supplemented their diet with macrophytes (15 %), macrobenthic invertebrates (12 %) and large zooplankton (11 %). Juvenile roach and bass had higher δ¹⁵N values than carp and roach did (12.31, 14.55, 7.54, 10.44 ‰, respectively). Bass consumed mainly juvenile roach (59 %), followed by macrobenthic invertebrates (25 %). Combining the nutrient balances and stable isotopes showed that sediment was the main nutrient pool, but that organisms in the mesocosms consumed little sediment organic matter.

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利用营养平衡和稳定同位素评估淡水混养生态系统中碳、氮和磷的去向

淡水混养可以通过饲养不同营养水平的物种来增加养分的利用。本研究旨在利用氮(N)和磷(P)的营养平衡以及碳（δ13C）和氮（δ15N）的稳定同位素，量化鱼类的营养平衡，确定鱼类的食物来源。利用稳定同位素混合模型估算了食物来源对鱼类日粮的贡献。在中生态系统中比较了3种处理：纯鱼（F处理：鲤鱼、蟑螂和黑鲈）、鱼-大植物（FM处理）和纯大植物（M处理）。鱼是用商业颗粒喂养的。结果表明，在鱼体中添加大型植物并没有改善水质。F和FM处理的叶绿素-a浓度显著高于M处理（分别为8.1、8.3和0.6 µg l−1）。无论何种处理，收获时沉积物中氮和磷含量最多（分别为93.5%和89.7% %）。鱼粉和鱼粉处理下，鲤鱼、蟑螂和鲈鱼的特定生长率相似，分别为1.19、0.36、0.94 % day−1。鲤鱼消耗90 %的商业饲料和8 %的大型底栖无脊椎动物，而蟑螂消耗50 %的商业饲料，并补充大型植物（15 %）、大型底栖无脊椎动物（12 %）和大型浮游动物（11 %）。幼蟑螂和鲈鱼的δ15N值高于鲤鱼和蟑螂（分别为12.31、14.55、7.54、10.44 ‰）。鲈鱼主要捕食幼蟑螂（59 %），其次是大型底栖无脊椎动物（25 %）。结合营养平衡和稳定同位素分析表明，沉积物是主要的营养池，但中生态系统的生物消耗的沉积物有机质很少。

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来源期刊

Aquaculture Reports Agricultural and Biological Sciences-Animal Science and Zoology

CiteScore

5.90

自引率

8.10%

发文量

469

审稿时长

77 days

期刊介绍： Aquaculture Reports will publish original research papers and reviews documenting outstanding science with a regional context and focus, answering the need for high quality information on novel species, systems and regions in emerging areas of aquaculture research and development, such as integrated multi-trophic aquaculture, urban aquaculture, ornamental, unfed aquaculture, offshore aquaculture and others. Papers having industry research as priority and encompassing product development research or current industry practice are encouraged.