Investigation on destructive effect of water-born CuO nanoparticles on gill histopathology of rainbow trout, Oncorhynchus mykiss



Nanotechnology as a modern science is rapidly expanding which can influx
many biological aspects due to large extent. For this reason, concerns about the
risks and consequences of this technology are rising in environment and especially
in water resources. The purpose of this study is to investigate the effect of waterborn
Cuo Nanoparticles on Oncorhynchus mykiss gill tissue, to detect a suitable
biomarker for noticing Copper in Water Resources. Samples weighted 18±3 gr and
exposure to Cuo Nanoparticels for a week with 25, 30, 50 and 100 ml/g doses.
Physicochemical properties of water were 14±2 Cº temperature, 8-8.5 pH and 270
mg/l Caco3. At the end of 7 days, 9 fish were catch randomly from each treatment
and second gill from left side of fish were removed for histological review.
Hyperplasia, Oedema, Epithelial lifting in secondary lamella, lamellar aneurysm
and Leukocyte infiltration was observed in gill tissues. In addition, the damage was
determined at various concentrations of copper nanoparticles. Result showed that
Cuo Nanoparticles, as copper ions, have significant adverse effects on gill tissues of
O. mykiss and gills can be a suitable biomarker for copper in water resources.
However, comparison of the extent and severity of injury stated that copper
nanoparticles cause much less injury than copper ions.