Abstract
Aquaculture is the last frontier to solve the
problem of the global deficiency of white protein. Some
studies reported that, nano-particles have enormous
potential in controlling the pathogens, improve the immune
and growth functions in aquaculture. The present
investigation was carried out to evaluate nano-ZnO (nZnO)
in comparison to its conventional form as a fish feed
additive in growth promoting and immunostimulation of
Nile tilapia (Oreochromis niloticus). Zinc oxide
nanoparticles were prepared using the chemical method and
mixed with the fish feed. 405 Oreochromis niloticus were
fed for 120 days on Zinc oxide conventional bulk scale
(ZnO) and nanoscale (nZnO) supplemented feed in
different concentrations (15, 30, 45 and 60 mg/kg of the
feed) in addition to the control which was fed on ZnO free
feed. nZnO (15mg/kg) achieved specific growth rates like
the higher concentrations of bulk ZnO (60mg/kg). The
60mg/kg nZnO gave the highest rates of Specific growth
rates(4 folds than control). growth hormone was higher in
serum of fish fed on nZnO supplemented feed than the bulk
form. Immunity was assessed through the measurement of
total protein and IgM titer and IL1-beta (IL-1β) gene
expression. Total protein and IgM titers revealed high
values increasing with the increase of concentration of ZnO
feed additive in its two forms compared to the control, but
nZnO showed better results than conventional ZnO.
Analysis of IL1-beta gene expression revealed that
60mg/kg conventional ZnO was the best concentration for
up-regulating the IL1-beta followed by the concentration
30mg/kg in the two forms; the nano and the conventional
form. The inorganic conventional ZnO up-regulated the IL1β better than the nZnO form. Zinc was concentrated
higher in muscles of fish fed on nZnO supplemented feed
more than conventional ZnO fed fish but still within the
permissible limits. One way ANOVA statistical analysis
was used in all analyses with p<0.05.
Original language | English |
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Title of host publication | CEST 2017, 15th International Conference on Environmental Science and Technology |
Subtitle of host publication | Rhodes, Greece, 31 August to 2 September 2017 |
Number of pages | 9 |
Publication status | Published - 1 Sept 2017 |