We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Potential risk assessment of different sizes of microplastics on the digestive system of hybrid sturgeon
Summary
Scientists fed tiny plastic particles to hybrid sturgeon fish and found that these microplastics damaged the fish's digestive system, changed how well they could digest food, and altered the helpful bacteria living in their guts. This matters because microplastics are everywhere in our water and food supply, and if they're harming fish this way, they could potentially cause similar digestive problems in humans who eat contaminated seafood or drink polluted water. The smaller plastic particles (1 micrometer) were just as harmful as the larger ones (5 micrometers), suggesting that even the tiniest plastic pieces pose health risks.
Microplastics are pollutants that are widely present in aquatic environments. This study utilized polyethylene microplastic particles of 1 μm and 5 μm to expose hybrid sturgeon (Acipenser baerii ♂ × A. schrenckii ♀), analyzing changes in intestinal ultrastructure, digestive enzyme activity, and gut microbial composition (based on high-throughput sequencing of the 16S rRNA V3-V4 region). The results indicate that MPs of both particle sizes cause changes in intestinal ultrastructure and digestive enzyme activity. The alpha and beta diversity of gut microbiota in the exposed groups were significantly higher than those in the control group. At the phylum level, the relative abundances of Bacteroidetes, Actinobacteria, and Desulfobacterota significantly increased (P < 0.01); at the genus level, the abundances of Pseudomonas, Lactobacillus, Enterobacter, Desulfovibrio, HIMB11, and Muribaculaceae also significantly increased (P < 0.01). Furthermore, functional predictions of the microbiota indicated that the abundance of functions related to diseases, cellular processes, and organism systems increased in the 5 μm treatment group, while the abundance of functions related to genetic information processing significantly decreased (P < 0.05, FDR < 0.05). This study reveals the potential risks of MPs to the digestive physiology and intestinal digestive system of sturgeon, providing a basis for further exploration of the mechanisms by which different particle sizes of MPs affect freshwater fish.