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Oxidative stress induced by nanoplastics in the liver of juvenile large yellow croaker Larimichthys crocea
Summary
Researchers exposed juvenile large yellow croaker fish to nanoplastics for 14 days followed by a 7-day recovery period and measured signs of oxidative stress in their livers. They found that antioxidant enzyme activity and lipid damage markers increased significantly at higher nanoplastic concentrations, and some effects persisted even after the recovery period. The study suggests that nanoplastic exposure may reduce fish survival rates and could have broader implications for fishery productivity.
There are many toxicological studies on microplastics, but little is known about the effect of nanoplastics (NPs). Here, we evaluated the oxidative stress responses induced by NPs (10, 10 and 10 particles/l) in juvenile Larimichthys crocea during 14-d NPs exposure followed by a 7-d recovery. After exposure, the activities of antioxidant enzymes (SOD, CAT, GPx) and MDA levels increased in the liver of fish at the highest NPs concentration. SOD and CAT activities remained elevated above the baseline after recovery under high-concentration NPs but returned to the baseline in two other NP treatments. Although lipid peroxidation in liver was reversible, juvenile fish in NPs treatments exhibited a lower survival rate than the control during both exposure and recovery. Furthermore, IBR value and PCA analysis showed the potential adverse effects of NPs. Considering that NPs can reduce the survival of fish juveniles, impacts of NPs on fishery productivity should be considered.