Instituto Español de Oceanografía, Centro Oceanográfico de Baleares, Muelle de Poniente s/n, 07015, Palma de Mallorca, Spain.
Instituto Español de Oceanografía, Centro Oceanográfico de Baleares, Muelle de Poniente s/n, 07015, Palma de Mallorca, Spain.
Environ Pollut. 2021 Jul 1;280:116960. doi: 10.1016/j.envpol.2021.116960. Epub 2021 Mar 17.
During the last years, ingestion of microplastics (MPs) has been quantified in marine species both with an ecological and commercial interest at sea and under experimental conditions, highlighting the importance to assess MP ingestion in commercially and aquaculture important species such as gilthead seabream (Sparus aurata) fish. In order to study the ingestion of MPs in a commercially valuable species, gilthead seabreams were exposed to an enriched diet with virgin and weathered low-density polyethylene (LDPE) pellets for three months followed by a detoxification period of one month of no exposure to MP enriched diets. Our results indicate that MP ingestion in these fishes increased with exposure time, and differences were found between treatments, showing the highest ingestion values after three months of exposure to MP enriched diets and in the weathered treatment. However, after one month of detoxification, no MPs were found in the gastrointestinal tracts of fish, reflecting no long-term retention of MPs in Sparus aurata digestive system. According to results from this study, exposure of fish to MP enriched diets does not affect fish size neither the Fulton's condition index as both parameters increased with time in all treatments (control, virgin and weathered). Both carbon and nitrogen isotopic signatures decreased with fish size in all treatments which could be related to an increase of nitrogen deposition efficiency in fish muscle with a high protein assimilation during the first months of Sparus aurata.
在过去的几年中，人们已经在海洋物种中定量检测到了摄入微塑料（MPs）的情况，这些物种具有生态和商业价值，无论是在野外还是在实验条件下，这都强调了评估商业和水产养殖中重要物种（如金头鲷）摄入 MPs 的重要性。为了研究商业价值高的物种中 MPs 的摄入情况，将金头鲷暴露于添加了原始和风化的低密度聚乙烯（LDPE）颗粒的丰富饮食中，为期三个月，随后进行一个月的无 MPs 丰富饮食暴露的解毒期。我们的研究结果表明，这些鱼类的 MPs 摄入随暴露时间的增加而增加，且不同处理之间存在差异，在暴露于 MPs 丰富饮食三个月后和风化处理中发现了最高的摄入值。然而，在一个月的解毒期后，鱼的胃肠道中没有发现 MPs，这反映出 MPs 在金头鲷消化系统中没有长期保留。根据这项研究的结果，暴露于 MPs 丰富饮食的鱼类的大小和富尔顿状况指数均不受影响，因为所有处理组（对照组、原始组和风化组）的这两个参数都随时间增加而增加。所有处理组的碳和氮同位素特征均随鱼的大小而降低，这可能与鱼肌肉中氮沉积效率的增加有关，因为在金头鲷的前几个月中，蛋白质的同化率很高。
