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.
Fisheries
S. Pourmozaffar1* S. Pourmozaffar1*; *, M. Nafisi Bahabadi *, M. Nafisi Bahabadi; , A. A. Movahedinia , A. A. Movahedinia; M. Mohammady M. Mohammady; Kh. Pazir5 Kh. Pazir5
Volume 2, Issue 4 , March 2014, , Pages 1-14
Abstract
Abstract Thepurpose of this study was to evaluate the effects of salinity adaptation on some growth factors, hematology and chloride cell changes in the gills of the rainbow trout within 60 days.Experimental groups include fresh water, varied salinities of 15, 20 and 25 parts per thousand (ppt) respectively. ...
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Abstract Thepurpose of this study was to evaluate the effects of salinity adaptation on some growth factors, hematology and chloride cell changes in the gills of the rainbow trout within 60 days.Experimental groups include fresh water, varied salinities of 15, 20 and 25 parts per thousand (ppt) respectively. The results showed that increasing salinity was reduced daily growth and SGR but FCR increased (P
M.J. Mohammadi; M Alishahi; A Aramoon; R Jehantigh; E Khaje Jopash; M Zarifjoo; H Dehdar
Volume 2, Issue 4 , March 2014, , Pages 33-41
Abstract
Abstract Recently use of some nutritive additive such as plant extracts increased in aquaculture. Hydroalcoholic extract of Plantago ovata (POE) supplemented to fish food at four different levels (0, 0.1, 0.5 and 1 percent) and some growth parameters, Hepatosomatic index and Spleen of Oncorhynchus ...
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Abstract Recently use of some nutritive additive such as plant extracts increased in aquaculture. Hydroalcoholic extract of Plantago ovata (POE) supplemented to fish food at four different levels (0, 0.1, 0.5 and 1 percent) and some growth parameters, Hepatosomatic index and Spleen of Oncorhynchus mykiss were investigated. This herb has antibacterial properties. 360 juvenile Oncorhynchus mykiss (30±5.23) randomly divided in twelve groups (four treatments and three replicates). All groups fed with experimental diet for 60 days. Bioassay conducted one and sixty days after applying treatment, and growth parameters were investigated. Finally Liver and Spleen of fishes weighed and results compared between treatments. Results showed that almost all growth parameters were increased in groups fed with 0.5 and 1 percent supplemented food with POE compare to the control group (P0.05). It can be concluded that POE can stimulate growth of rainbow trout and it has not negative effective on the Liver of juveniles even it has some good effects on the efficiency of spleen.
