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首页> 外文期刊>ICES Journal of Marine Science >Scenarios of fish waste deposition at the sub-lagoon scale: a modelling approach for aquaculture zoning and site selection
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Scenarios of fish waste deposition at the sub-lagoon scale: a modelling approach for aquaculture zoning and site selection

机译：鱼类废物沉积的情景在泻湖规模：水产养殖区分区和场地选择的建模方法

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Spatial planning, including zoning and site-selection steps, is necessary to determine locations that minimize environmental impacts ofaquaculture and respect ecosystem carrying capacities. This study aimed to analyse potential benthic waste deposition in a broad range offish farming situations to facilitate zoning. To this end, we simulated waste dispersion for 54 aquaculture scenarios combining three red drum(Sciaenops ocellatus) farm types (Small, Medium, and Large) based on real farm characteristics and 36 sites with contrasting hydrodynamics inMayotte’s North-East Lagoon. Key forcing variables and parameters of the particle-dispersion model for farms (layout and solid waste fluxes),species (feed- and faeces-settling velocities) and sites (depth and barotropic currents) were obtained. From the outputs of the 54 simulations,relationships between hydrodynamic regimes and deposition rates, area of influence and distance of influence of the farm were analysed.Critical limits of current intensity that reduced deposition rate below selected deposition thresholds were identified. For instance, to preventdeposition rates greater than 12 kg solids m~(-2) year~(-1), the mean current intensity should exceed 10.2 and 6.8 cm s~(-1) for Medium and Largefarms, respectively. The study confirmed that production level is not the main factor that influences deposition rates; instead, management ofthe entire farm (cage position, distance between cages) must be considered to predict impacts more accurately and guide site selection.
机译：空间规划，包括分区和站点选择步骤，是确定最小化环境影响的地点水产养殖和尊重生态系统承载能力。本研究旨在分析各种底蕴的废物沉积养鱼养殖局促进分区。为此，我们模拟了54个水产养殖场景的废物分散，组合了三个红色鼓（Sciaenops Ocellatus）基于真实农场特征的农场类型（小，中等，大）和36个地点，具有对比流体动力学Mayotte的东北泻湖。农场粒子分散模型的关键迫使变量和参数（布局和固体废物通量），获得物种（饲料和粪便稳定速度）和网站（深度和波衡流电流）。从54模拟的输出，分析了流体动力学制度与沉积速率的关系，对农场的影响面积和农场影响距离。鉴定了所选沉积阈值以下降低沉积速率的电流强度的临界限制。例如，防止沉积率大于12千克固体M〜（-2）年〜（-1），平均电流强度应超过中型的10.2和6.8cm s〜（-1）农场分别。该研究证实，生产水平不是影响沉积率的主要因素;相反，管理整个农场（笼式位置，笼子之间的距离）必须考虑更准确地预测影响和指导现场选择。

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