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Microplastics in aquaculture - Potential impacts on inflammatory processes in Nile tilapia
Summary
Researchers fed Nile tilapia a diet containing a mixture of four common microplastics and found that the particles triggered inflammatory responses in both adult and juvenile fish. The microplastics activated immune pathways and caused tissue changes in the gut and other organs, with juveniles being more sensitive. Since tilapia is one of the most widely farmed fish in the world, these findings raise concerns about the safety of farm-raised fish exposed to microplastic-contaminated water.
Aquaculture is essential for meeting the growing global demand for fish consumption. However, the widespread use of plastic and the presence of microplastics in aquaculture systems raise concerns about their impact on fish health and the safety of aquaculture products. This study focused on the Nile tilapia (), one of the most important aquaculture fish species globally. The aim of this study was to investigate the effects of dietary exposure to a mixture of four conventional fossil fuel-based polymers (microplastics) on the health of adult and juvenile Nile tilapia. Two experiments were conducted, with 36 juvenile tilapia (10-40 g weight) exposed for 30 days and 24 adult tilapia (600-1000 g) exposed for 7 days, the former including a natural particle (kaolin) treatment. In the adult tilapia experiment, no significant effects on intestinal health (Ussing chamber method), oxidative stress, or inflammatory pathways (enzymatic and genetic biomarkers) were observed after exposure to the microplastic mixture. However, in the juvenile tilapia experiment, significant alterations in inflammatory pathways were observed following 30 days of exposure to the microplastic mixture, indicating potential adverse effects on fish health. These results highlight the potential negative impacts of microplastics on fish health and the economics and safety of aquaculture.
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