A Louei Monfared; A Kalili; L Khalili; M.R Kalbasi
Volume 3, Issue 3 , May 2015, , Pages 13-22
Abstract
Abstract Present work investigates the effects of nanosilver administration on histology of gill by direct and indirect methods in rainbow trout larva. In the direct mode, 300 larvae were divided to 6 equal groups randomly and exposed to 0.015, 0.031, 0.062, 0.125, 0.25 and 0.5 ppm over 25 days. In the ...
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Abstract Present work investigates the effects of nanosilver administration on histology of gill by direct and indirect methods in rainbow trout larva. In the direct mode, 300 larvae were divided to 6 equal groups randomly and exposed to 0.015, 0.031, 0.062, 0.125, 0.25 and 0.5 ppm over 25 days. In the indirect mode, 50 larvae were exposed to zeolite covered by silver nanoparticles. In addition, 50 larvae were kept in the incubators which free of any additive nanomaterials as control. In all of the experimental groups, on the days 4, 8, 12 and 25 after treating tissue samples were taken and histological alterations of the gill were examined. In the gill tissues of the direct exposed to nanosilver as 0.062 and greater concentrations; severe histoloogical and histometrical alterations include aneurism in the secondary lamellae of gills, hyperplasia of epithelium of gills as well as the adhesion of the gill lamellae were seen, as compared with control animals. In addition, in the direct exposing method; any increasing in the silver nanoparticles concentrations could lead to significant elevation in the gill lamellar as well as filament diameters (p≤0.05). Furthermore, indirect exposure to silver nanoparticles could not affect the gill integrity. It is concluded that nanosilver administration in the larval stage of the trout must be taken by zeolite covered by silver nanoparticles.
