فهرست مطالب امین اسدی امیرابادی

In this study, the effect of different levels of the amino acid methionine on some growth factors, mucosal immunity and antibacterial properties of mucus in Rutilus frisii kutum was investigated. Therefore, first 420 juvenile Rutilus frisi katum with an average weight of 1.24± 0/02 g were prepared, then 35 fish were randomly distributed in 12 tanks with four treatments and three replications. They were then fed at doses of 0, 2/5, 5 and 10 mg / kg methionine for 60 days, respectively. The results of this study showed that different levels of methionine had no effect on whitefish growth indices, so that there was no significant difference between treatments containing different levels of methionine in terms of different growth indices. The highest lysozyme activity was observed at 5% level, and the amounts of alkaline phosphatase and mucus-soluble protein were observed at 10% level. The results showed that the highest antibacterial activity was related to the levels of 5 and 10% of the amino acid methionine. According to the results, it can be said that 5 and 10% levels of the amino acid methionine can be effective in improving the activity of some digestive enzymes (lysozyme, alkaline phosphatase), soluble proteins and antibacterial activity in the study species. Achieving more complete and accurate results requires more research in this area.

Improving the efficiency of the fish's immune system is one of the most important ways to prevent disease and improve growth. Among the safety stimuli, natural types, especially plant stimulants, have recently received more attention due to less damage to fish and the environment. In this study, the effects of improving the growth and immune stimulation of graphite as a plant safety stimulant in rainbow trout with an average weight of 15.79±3.36 g for 60 days were investigated. After 2 weeks of adaptation, 0.5, 1.5 and 1.5 g of graphite powder were added to each kg of fish feed and a graphite-free diet was used as a control. Biometrics were recorded every 10 days and mortality was recorded daily and growth and survival indices were compared between different groups. In order to measure the amount of lysozyme, the tissues of liver, spleen and all fish were isolated and after homogenization and using turbidity method, the amount of lysozyme was determined. The results showed that the addition of graphite to the diet did not cause a significant change in any of the growth indices (P>0.05). In all groups that received graphite with food, the amount of lysozyme in different tissues was higher than the control group, but this difference was only in the amount of lysozyme in the tissue of all treatments of 1.5 and 1.5 g of graphite compared to the group. There was a significant difference between control and two treatments (P<0.05). According to the results of this study, the addition of graphite to the salmon diet improves the innate immunity of kidney tissue.

In this study, The effect some growth factors of Common carp (Cyprinus carpio) of feeding with different sources of zinc and iron (Nano-particles) was investigated. For this purpose, 420 specimens (with an initial average weight of 7.4 ± 45 g) were prepared. Fishes were sterilized and adapted to the laboratory conditions for 10 days. Then, fish were randomly divided into seven groups. The first group was considered as control and other groups received 10, 50 and 100 µg of iron and zinc nanoparticles per gram of diet for 75 days, respectively. The results of biometry showed that the fish fed with nanoparticles had better growth indicators than fish of control group. Also, improvement of growth indicators in fish fed with zinc was concentration-dependent, so that the greatest increase in growth factors was related to the zinc concentration (100 µg per g), but this finding was not observed in the fish fed with iron. The results showed that the adding of iron and zinc Nano-particles in the diet may play an important role in increasing and improving growth factors of Common carp.