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Microplastics are Systemic in All Feed Ingredients and Have Limited Impact on Sub-Clinical Health Indicators, Feed Intake or Diet Digestibility When Fed to Atlantic Salmon (Salmo Salar)
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Atlantic salmon were fed polypropylene microplastics at five concentrations for 90 days; control fish already contained PP from standard feed, and higher-dose groups showed liver and intestinal effects, raising concerns about microplastic exposure in aquaculture.
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Researchers reviewed microplastic contamination in fish across all seven continents, finding marine fish were studied 2.6 times more than freshwater species, and that microplastics trigger oxidative stress, alter biochemical pathways, and accumulate through biotransformation in fish tissues globally.
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Researchers reviewed the physiological and immunological effects of microplastic exposure in fish, finding that these particles smaller than 5 mm induce a range of biological disruptions including immune modulation, oxidative stress, and systemic health impacts with broader implications for aquatic ecosystem integrity.
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Three analytical methods were compared for detecting microplastics in salmon tissue, and all three found low but measurable concentrations. The study highlights both the promise and limitations of current methods, underscoring the need for standardization to accurately assess how much plastic consumers ingest through farmed and wild salmon.
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