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Changes in hematological parameters and plasma components of olive flounder, Paralichthys olivaceus exposed to acute microplastics
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Researchers exposed juvenile olive flounder to polyethylene microplastics at concentrations up to 2,500 mg/L for 96 hours and observed significant reductions in blood glucose, cholesterol, calcium, and liver enzyme AST without causing mortality. These findings indicate that acute microplastic exposure induces measurable blood physiological disruptions in fish even at sublethal doses.
Juvenile olive flounder, Paralichthys olivaceus (mean weight 66.7±7.1 g; mean length 19.2±0.9 cm) in a bio-floc environment were exposed to microplastic (PE: polyethylene, size 40-48 μm) at 0, 4, 20, 100, 500 and 2,500 mg L -1 for 96 hours. No P. olivaceus deaths were observed following microplastic exposure. In the plasma components, calcium was significantly decreased whereas there was no significant change with magnesium following microplastic exposure. Glucose was significantly decreased with over 100 mg L -1 at 48 hours and 20 mg L -1 at 96 hours. Cholesterol was significantly decreased with over 20 mg L -1 after 48 hours, whereas there was no significant change in the total protein content. In enzymatic plasma components, the AST (Aspartate aminotransferase) was significant decreased by microplastic exposure. The results of this study indicate that acute exposure to microplastic induces blood physiological changes in P. olivaceus .
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