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Intestinal alterations in European sea bass Dicentrarchus labrax (Linnaeus, 1758) exposed to microplastics: Preliminary results
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Researchers fed European sea bass diets containing virgin and pollutant-contaminated PVC microplastic pellets for 90 days and examined the effects on their intestines. They found moderate tissue damage and increased mucus cell activity in fish exposed to both types of microplastics, with pollutant-laden particles causing the most pronounced changes. The study provides early evidence that chronic microplastic ingestion can alter gut health in commercially important fish species.
This study investigates, for the first time, the intestinal responses of European sea bass Dicentrarchus labrax chronically exposed to microplastics through ingestion. Fish (n = 162) were fed with 3 different treatment diets for 90 days: control, native polyvinyl chloride (PVC) and polluted polyvinyl chloride (PVC) pellets. Intestines were fixed and processed for histological analysis using standard techniques. Histopathological alterations were examined using a score value (from 0 to 4). The distal part of intestine in all samples proved to be the most affected by pathological alterations, showing a gradual change varying from moderate to severe related to exposure times. The histological picture that characterizes both groups especially after 90 days of exposure, suggests that the intestinal functions can be in some cases totally compromised. The worst condition is increasingly evident in the distal intestine of fish fed with polluted PVC pellets respect to control groups (p < 0.05) to different exposure times. These first results underline the need to assess the impact of increasing microplastics pollution on the marine trophic web.
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Effects of microplastic ingestion in Dicentrarchus labrax (Linnaeus, 1758) intestine health
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This master's thesis investigated how ingested microplastics affect intestinal health in European sea bass (Dicentrarchus labrax), a commercially important fish species. The research addresses gaps in understanding how microplastic exposure causes intestinal damage in farmed and wild fish relevant to seafood safety.
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