We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Individual and combined dietary exposure to polyethylene microplastics and cadmium in Litopenaeus vannamei: biological effects and bioaccumulation
Summary
Scientists fed shrimp a combination of microplastics and cadmium (a toxic heavy metal) and found that together, these pollutants stunted the shrimps' growth more than either one alone—and the shrimp also absorbed higher levels of both contaminants into their bodies, especially in organs like the liver-equivalent (hepatopancreas). This matters because shrimp are a popular seafood, and if microplastics help "smuggle" more heavy metals into the animals we eat, our exposure to these contaminants through diet could be higher than previously thought.
Although polyethylene microplastics (PE-MPs) have been documented to adsorb heavy metals, such as cadmium (Cd) in aquatic environments, the effects of their combined ingestion on marine organisms remain scarcely understood. This study evaluated the individual and combined effects of spherical PE-MPs (53-63 μm) and Cd on survival, growth, and bioaccumulation in juvenile shrimps Litopenaeus vannamei exposed via feeding for 21 days. Individual (300 mg kg PE-MPs and 30 mg kg Cd) and combined exposures did not affect survival rates. However, the final weight was significantly lower in the combined treatment (3.8 ± 0.1 g) compared to the control (4.3 ± 0.2 g), suggesting that co-exposure to PE-MPs and Cd adversely affected growth. The highest PE-MPs accumulation at 21 days under the combined treatments was observed in the gastrointestinal tract (GIT) (981.7 ± 70.8 MP g). Cadmium (Cd) accumulation followed the order hepatopancreas (HP) > GIT > gills (GL) > exoskeleton (EX) > muscle (MU), reaching its highest concentration in the HP of the combined treatment (91.7 ± 1.4 μg g), even higher than in the treatment with Cd alone (80.5 ± 5.6 μg g). Overall, dietary co-exposure to PE-MPs and Cd for 21 days reduced growth and increased the bioaccumulation of both contaminants, suggesting that combined exposure may modify contaminant bioavailability and retention. Further studies are needed to elucidate the metabolic mechanisms associated with this response.