This study was centred on the carbon budget of Integrated multitrophic aquaculture (IMTA) systems in earthen ponds stocked with the freshwater Amazon river prawn (Macrobrachium amazonicum) and Nile tilapia (Oreochromis niloticus), with or without different added substrates. The experimental design was completely randomized, with three treatments and four replicates. Carbon entered the system mainly through the diet (~58–63%), inlet water (~29–34%) and absorbed gases (~5–7%). Most of it was accumulated in the sediments (~42–70%) or discharged in the outlet water (~12–13%). The tilapias converted ~12% of the carbon available into harvested biomass, and the prawns converted only ~1%. The retention of carbon inside the ponds from the inlet water was ~1 tonne ha⁻¹, and the atmosphere ~0.1–0.3 tonnes ha⁻¹. The carbon accumulated in the sediment was about 3.5 tonnes ha^-1. Data suggest that the integrated aquaculture in stagnant earthen ponds sequesters high quantities of carbon from the nutrient-rich source water and atmosphere, and the addition of substrates at 50% of pond area do not improve the assimilation of carbon by the farmed species, having a low effect on the carbon budget.

中文翻译：

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尼罗罗非鱼（Oreochromis niloticus）和亚马逊河虾（Macrobrachium amazonicum）综合水产养殖系统的碳收支

这项研究的中心是在装有淡水亚马逊河对虾 ( Macrobrachium amazonicum ) 和尼罗罗非鱼 ( Oreochromis niloticus ) 的土池中的综合多营养水产养殖 (IMTA) 系统的碳收支，添加或不添加不同的底物。实验设计是完全随机的，有 3 个处理和 4 个重复。碳主要通过饮食（~58-63%）、进水（~29-34%）和吸收的气体（~5-7%）进入系统。大部分积聚在沉积物中（~42-70%）或排放在出水处（~12-13%）。罗非鱼将约 12% 的可用碳转化为收获的生物量，而对虾仅转化了约 1%。来自进水的池塘内碳的保留量为 ~1 吨公顷^-1，和大气 ~0.1–0.3 吨 ha ^-1。沉积物中累积的碳约为 3.5 吨公顷^-1。数据表明，停滞土池中的综合水产养殖从富含营养的源水和大气中固存了大量碳，在池塘面积的 50% 添加底物并不能改善养殖物种对碳的同化，具有对碳预算的影响很小。