St. Andrews Biological Station, Fisheries and Oceans Canada, St. Andrews, NB E5B 0E4, Canada.
Aquaculture, Biotechnology and Aquatic Animal Health Science Branch, Fisheries and Oceans Canada, Ottawa, ON K1A 0E6, Canada.
Mar Pollut Bull. 2021 Aug;169:112557. doi: 10.1016/j.marpolbul.2021.112557. Epub 2021 Jun 2.
Several trace-elements have been identified as indicators of finfish aquaculture organic enrichment. In this study, sediment sampling at finfish farms was completed as part of an Aquaculture Monitoring Program in three distinct Canadian regions. Despite diverse datasets, multivariate analyses show a consistent clustering of known direct (Cu and Zn) and indirect (Cd, Mo and U) tracers of aquaculture activities with sediment organic matter (OM) and/or total dissolved sulfides concentrations. OM content was also a predictor of Cu, Zn, Mo and U concentrations according to decision tree analyses. Distance from cages did not emerge as a strong driver of differences among sampling points; however, a tendency towards negative associations is clear especially for Zn. Enriched stations as determined after geochemical normalization were mostly localized within 150 m of net-pens. Selected trace-elements (in particular Zn) can be useful indicators of aquaculture organic enrichment in different ecosystems and valuable tools for monitoring programs.
几种微量元素已被确定为鱼类养殖有机富营养化的指标。在这项研究中，作为三个不同加拿大地区水产养殖监测计划的一部分，完成了鱼类养殖场的沉积物采样。尽管数据集不同，但多元分析显示，已知的直接（Cu 和 Zn）和间接（Cd、Mo 和 U）示踪剂与沉积物有机质（OM）和/或总溶解硫化物浓度一致聚类。根据决策树分析，OM 含量也是 Cu、Zn、Mo 和 U 浓度的预测因子。距离笼子的距离并没有成为采样点之间差异的主要驱动因素；然而，尤其是 Zn，负相关的趋势很明显。经过地球化学归一化后确定的富化站主要集中在网箱 150 米范围内。选定的微量元素（特别是 Zn）可以作为不同生态系统中水产养殖有机富营养化的有用指标，也是监测计划的有价值工具。
