جستجوی مقالات مرتبط با کلیدواژه "نانوذرات سلنیوم" در نشریات گروه "شیلات"

This study was conducted with the purpose of investigating the addition of different concentrations of selenium and iron nanoparticles to the diet and its effect on the values of growth indicators and the percentage of carcass chemical compounds in rainbow trout (Onchorhynchus mykiss). In this research, 240 rainbow trout with an average weight of 5.21 ± 0.02 grams were fed for 8 weeks with diets containing 0.5, 1, 2 mg/kg of selenium nanoparticles in amounts of 10, 30 and 50 mg. iron nanoparticles in a completely randomized design to 4 experimental treatments; Treatment 1 (control group), treatment 2 (0.5 Se + 10 Fe), treatment 3 (1 Se + 30 Fe) and treatment 4 (2 Se + 50 Fe) were each divided by 3 repetitions and fed as free ions. According to the results, the values of body weight, percentage of weight gain, specific growth rate and protein efficiency ratio in the amount of 2 mg of selenium nanoparticles and 50 mg of iron nanoparticles increased compared to other values and had a significant difference with other treatments (p<0.05). Also, food conversion coefficient, in amounts of 2 mg of selenium nanoparticles and 50 mg of iron nanoparticles, had a significant difference with other treatments (p<0.05). In carcass analysis, the highest amount of protein was found in the treatment of 0.5 mg/kg of selenium nanoparticles and 10 mg of iron nanoparticles, which was significantly different from the control treatment (p<0.05). And by increasing the amount of selenium and iron nanoparticles in the experimental treatments, the amount of protein increased. Also, in terms of the amount of fat, a significant difference was observed between the experimental treatments and the control treatment (p<0.05). The results showed that the use of 2 and 0.5 mg of selenium nanoparticles and 10 and 50 mg of iron nanoparticles has a good effect on rainbow trout.

This research investigated the influence of selenium nanoparticles (SeNPs) on the reproductive performance of female rainbow trout (mykiss Oncorhynchus) broodstocks. A total of 120 female broodstock were selected from breeders of the Shahid Motahary Coldwater Fishes Genetic and Breeding Research Center. After adaptation, fish were divided into four treatments in three replicates. Fish were fed diets containing 0 (control) 0.5, 1 and 2 mg SeNPs per kg of diet for 60 days. Eggs quality parameters such as fecundity, fertilization rate, eyed egg rate, hatching, etc. were evaluated. The highest fertilization rate was observed in fish fed with 2 mg selenium (99.30%), which had a significant difference with control groups (p< 0.05) but did not show any significant difference (p>0.05) with fish fed 0.5 mg and 1 mg SeNPs. Broodstocks fed with 2 mg SeNPs had the highest absolute fecundity, which had a significant difference with groups fed 1 mg SeNPs (p <0.05), but did not show significant difference with other two treatments (p >0.05). ) The highest and the lowest relative fecundity were seen in group fed 2 mg SeNPs and 1 mg SeNPs, respectively. However, there was no significant difference in relative fecundity between treatments (p >0.05). The highest egg diameter was in fish fed 0.5 mg SeNPs. Egg diameter in the control group, fish fed 2 and 1 mg SeNPs, were 5.39, 5.39 and 5.40 mm, respectively). There was no significant difference for egg diameters among gruops (p> 0.05). The highest and the lowest mean total egg weight were in group fed 0.5 mg SeNPs and 1 mg SeNPs, respectively, and no significant differences were observed between treatments (P >0.05). The highest percentage of hatching was observed in groups fed 2 mg SeNPs, which had a significant difference with other treatments (p <0.05). The highest survival rate was observed in groups fed 2 mg SeNPs too, which showed no significant difference with other treatments (p >0.05). Increase in the survival rate associated with an increase in the concentration of SeNPs. In general, inclusion of SeNPs in diet, improve the quality and quantity of eggs and reproductive function (fertilization, eyed rate and hatching) in rainbow trout breeders.