Effects of Polystyrene Nanoplastics on Liver Histological Indices and Growth and Survival Indices of Rainbow Trout (Oncorhynchus mykiss)

Document Type : Research Paper

Authors

1 M.Sc. graduate, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

2 Associate professor of Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

3 Assistant professor of Department of Fisheries, Faculty of Natural Resources, University of Tehran, Kara

4 Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

5 Professor, Department of Zoology, Faculty of Biology, University of Tehran, Tehran, Iran

6 Professor, Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran

10.22059/jfisheries.2024.360226.1389

Abstract

Despite the development of polystyrene nanoplastics (PSNPs) in different fields, including nanotechnology, environment, industries, and their possible approach to aquatic ecosystems, a few studies have been conducted on nanoecotoxicology in aquatic animals. Therefore, this study was designed and conducted to measure the effect of toxicity of the PSNPs while transferring from the diet to the body of the fish (food concentrations= 0.1, 10, and 100 mg/kg) on juvenile rainbow trout (Oncorhynchus mykiss) in a 28-day chronic treatment and the control group (food concentration = 0 mg/kg) after the 7-day adaptation period, in three repetitions (15 juvenile trout were included in each repetition per concentration). Depending on the target test, fish sampling in the treatment group was taken after 24 h without food. According to the results, the survival rate (SR) (84.44 ± 3.14%) was significantly reduced with the highest dose of PSNPs compared to other treatments (P<0.05). But other growth indices did not show statistically significant difference (P>0.05). From the point of view of tissue pathology of polystyrene nanoplastic in the liver tissue in treatment 3 and 4, injuries such as vacuolation, necrosis, sinusoidal expansion and pyknotic nucleus were observed in rainbow trout. Based on the obtained results, the negative effects of polystyrene nanoplastic release on health and immunity at the cellular level were seen in liver histology in the studied aquatic sample. In general, this study showed that the entry of nanoplastic particles through the digestive tract causes changes in the histological parameters of the liver. However, more comprehensive studies are needed in this field.

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