جستجوی مقالات مرتبط با کلیدواژه « کپور معمولی » در نشریات گروه « محیط زیست »

With the development of nanotechnology and materials science, however, these materials also have been used increasingly with the potential toxic effects of many unknown substances and many nano-particles were built with new properties and new despite. Therefore, in this study the effects of feeding with different sources of iron and zinc in the tissue of common carp (Cyprinus carpio) were measured.

For this purpose, 420 common carp (with an average initial weight 45±4.7 g) was prepared, the fish sterilization and adapted to the laboratory conditions for 10 days. Then fish were randomly divided into seven groups, the first group was considered as control groups respectively and other fish received values ​​of 10, 50 and 100 micrograms of iron and zinc nano-particles per gram of food for 60 days.

Microscopic studies of organs (liver, kidney) study showed that increasing the concentration of nano-materials could have more evenly histopathological lesions in the liver tissue and cells. In the medium and low concentrations of both nano-particle and in high doses of iron nano-particles, by removing the inducer tissues could again resume their physiological activity, but in high doses, unlike the iron nano-particles, the repair tissue was not resumable.

 From the above results it can be concluded that increasing the concentration of the nano-particles could increase tissue damage and can be considerable factors.

Molecular methods have been used for systematic science and identification of fungal diversity. Among phylogenetic markers, the ITS gene has been identified as one of the most prominent methods of studying fungal communities. The purpose of this research is to classify fungi and analyze their communities in aquaculture systems. In this study, after two-month rearing period of common carp, water quality and fungal community of farming systems including biofloc and recirculating aquaculture system were evaluated. In this study, after two-month rearing period of common carp, water quality and fungal community of farming systems including biofloc and recirculating aquaculture system were evaluated. The results of this study indicated that the water quality parameters in both systems were well within the acceptable levels for common carp culture. The identification of fungal showed that a large part of this population is unknown. The only known and dominant species in both systems is Homophron spadiceum. Therefore, there was no difference in known species and communities.

Due to the increasing use of nanoparticles in human activities, as well as its role in reducing the adverse effects of heavy metals on living organisms, at this study the effects of sub-lethal concentrations of copper nanoparticles were discussed on growth factors and biochemical composition carcass of common carp.

82 carp with an average weight of 42 ± 2 g was prepared and after adaptation for the laboratory condition, were exposed at 42 days at three treatments (10, 40, 80 ppm) and three replicates respectively, also a control group were prepared with three replications under the affect of sub-lethal concentrations of copper oxide nanoparticles.

Analysis of growth indices showed that all growth indices had significantly different (P<0/05) with metal treatments in compared to the control group. So the control group had the highest average body weight, percent of body weight, SGR rate, and feed conversion efficiency with averaging 2.93. The lowest specific growth rate and the highest rate of conversion were related to the treatment number three (80 ppm), respectively. The amount of ash, fat, protein and maximum moisture was observed at the control group. The highest percentage of protein and fat was at treatment (3) and concentration of 80 milligrams per litre of copper oxide nanoparticles that in this regard showed significant differences (P<0.05) with the control group.

The results indicate that the presence of copper oxide nanoparticles in aquatic ecosystems have negative effects on growth and biochemical composition of fish carcasses even at sub-lethal concentrations, that by increasing the concentration of the nanoparticles in aquatic ecosystems, the influence of these effects will become clearer.

Biological nitrification, in the system that has a proper substrate to replace bacteria is more efficient than other systems. The major problem substrates, such as substrates that are made of synthetic polymers are their high cost of production and environmental problems. The aim of this study using wheat stalks as a substrate cost as well as review performance on the survival of fish.

To do this, the study added 10% and 5% of the word water storage tank size (240 liters size) of wheat stalks (starch). Control over two groups, one control (no wheat stem) control group (three treatments with three replications). You can calculate this student 10, best, most, 24, 48, 72 and 96 hours after adding ammonia. A weight of 0.28 g is added to each tank in the test volunteer. Treatments at this stage observe pre-budget law, leading to limited reservoirs of wheat stalks containing mosques. Mortality rates were counted 24, 48, 72 and 96 hours after the addition of ammonia. There was no food. One-way ANOVA was used to compare data between treatments and each one by time. The means were compared by SPSS software using LSD test at 0.05 level of confidence.

The results showed that the ammonia treatment is significantly different than the control group (p > 0/05). The amount of ammonia in treated compared with each other, there was a significant difference (p > 0/05). Greatest amount of ammonia reduced to 10% of the wheat stalk; Lowest fish mortality rates in the second stage of the treatment, 10% of wheat stem (2 number), as well as the control group (without wheat) had the highest mortality of fish (15 number). Results of our study showed that nitrification cycle in the reservoirs that 10% of the volume is dedicated to wheat straw up to 32 times more efficient than the other tanks (tanks without wheat). Well as present study showed that the use the wheat stalks can have a significant role in the increasing the chance of survival of fish, in the face of hyper-acute ammonia.

The aim of this study was to determine the effects of amino acid glycine on growth indices, survival rate, food intake and resistance to salinity stress in Common carp (Cyprinus carpio</em>) fingerlings. Fish with an average weight of 15.46±0.18 gr were devided in to four groups and fed with different levels of glycine including diets containing 0 (control), 0.5 (treatment 1), 1 (treatment 2) and 1.5 (treatment 3) of glycine were fed for 60 days and then exposured to salinity stress 15 ppt for 72 houres. The experimental design was a complete randomized data analysis performed SPSS and Excel software package. The results showed that there was no significant difference among studied groups regarding growth indices (final weight, SGR, CF and FCR) (P>0.05). Body weight gain affected significantly by glycine (P<0.05). The addition of glycine to the diet increases observed in survival and resistance to stress salinity in common carp. Hence according to the results obtainer of present study, it can be concluded that the glycine improved the resistance can increase survival of common carp under salinity stress.

The aim of the present study was to investigate the effects of olive pomace replacement on blood indices and growth of common carp of Cyprinus carpio Common carp with average weight of 19.97 ± 0.05 gr. And average length of 10.55 ± 0.49 centimeters with 6 diets including 0, 3, 6, 9, 12 and 15% olive pomace for 8 weeks in The aquarium was fed. Feeding three times a day at satiation fish was done. After 56 days, the results showed that the 6% level showed the highest growth in terms of weight, length, weight gain, body weight gain, specific growth rate, feed efficiency and liver index But the difference in viscera index was not significant.Blood parameters of common carp showed that in some indices, including RBC, hemoglobin, hematocrit, monocyte and MCHC, no significant differences were observed But in the number of white blood cells, neutrophils, lymphocytes, MCH, MCV, there was a significant difference. The results of this study indicate positive effect of olive pomace replacement to 6% level without negative effect on growth performance and blood factors in common carp ruminant diet. And you can suggest a level of 6% as the appropriate level for replacement.