![]() ![]() In North America, where they are considered invasive, silver carp deplete food resources for native species and in so doing occupy increased niche space. This ability drives their efficient consumption of phytoplankton and, because they feed low on the food chain, they have an important place in aquaculture worldwide. Silver carp regularly consume and digest particles of food as small as 5 μm. Our studies assessed the dosage-effect relationship with physiological stress on silver carp when exposure to microplastics. High microplastic concentration (800 μg/L) definitely cause significant damage to gills and intestines, in this situation, far beyond the possibility of fish own repair, and even when the threaten removed, silver carp can't recovery soon. Low microplastic concentration (80 μg/L) induced oxidative stress and up-regulation of TUB84 and HSP70 gene in intestine, and silver carp have ability to recover after the exposure to microplastic was removed. The results revealed that microplastics can pass through the whole digestive tract of silver carp and be excreted by feces. The aim of this study was to assess the physiological response of silver carp exposed to 5 μm polystyrene microspheres during 48 h of exposure followed by 48 h of depuration through the gill histology, and oxidative stress biomarkers in intestine. Silver carp (Hypophthalmichthys molitrix), a species filter-feeding planktivorous fish, feed on particle between 4 to 85 μm in size, and the respiratory process works together with feeding mechanism when filtering plankton from water. Abundant microplastics was found in aquatic ecosystem and aquatic organisms, which raised many concerns in public.
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