|
|
|
|
|
|
|
RSS |

|
|
 |
|
|
|
|
 |
Search published articles |
 |
|
Showing 14 results for Sarvi
B Sarvi , A Matinfar, H Mahmoudzadeh , G.r Eskandary , Y Abdollah Tabar , Volume 19, Issue 1 (4-2010)
Abstract
Feeding behavior of yellowfin seabream larvae during the first two weeks of larval life was studied by feeding larvae on different ratios of live food and microencapsulated diet (MED). Food consumption rate increased progressively with increasing larval weight. The results from visual observation of the larval guts under a light microscope indicated that yellowfin seabream larvae were able to ingest and digest MED from the onset of exogenous feeding.
Comparing the average number of rotifers and MED ingested by larvae in treatments including either only live food or MED did not show any significant differences (P>0.05). In addition, the gut contents examination from the larvae fed simultaneously on both rotifer and MED, revealed that the larvae's tendency towards live food and/or MED was a function of live food density in the rearing tanks. The larvae preferentially ingest live food even when these are present at a very low concentration in comparison to MED. The mouth diameter of larvae has a strong influence on the amount of ingested rotifers and MED.
There was a significant positive correlation between larvae growth and the average number of both live food and MED ingested by larvae in this trial (P<0.01). Although larvae survival rate had a positive correlation with the number of rotifers ingested, the amount of MEDin the larvae's gut did not show effect on larvae survival rate (P>0.05).
S Mohammadi, K Sarvi Moghanlou, B Atashbar, A Imani, Volume 25, Issue 4 (1-2017)
Abstract
The application and environmental hazards of nanotechnology to aquatic species are increasingly growing. To address the issue, the present study was designed and carried out to elucidate the toxic effects of silver nanoparticles on growth, survival and reproductive traits of Artemia urmiana. The experiment consisted of five treatments, namely control group and those exposed to 0.001, 0.01, 0.1 and 1 mgl-1 silver nanoparticles, with four respective replicates. To do so, 500 newly hatched nauplii were counted and transferred to 1 liter containers exposing to various concentrations of the silver nanoparticles . Microalgae Dunaliella tertiolecta and zymogenic was used to feed artemia. Growth and survival rates were recorded on days 8, 11, 17, 20 and 23. After sexual maturation, artemia were transferred to a new environment free from nanoparticles and their reproductive traits were studied. Results showed that higher concentrations of silver nanoparticles led to lower survival rate and augmented growth rate of artemia (p<0.05). Regarding reproductive traits, group exposed to 1mgl-1 silver nanoparticles showed the lowest total offspring, offspring per day, offspring per brood and life span (p<0.05). In conclusion, the discharge of silver nanoparticles even at lower concentrations would undesirably influence reproductive cycle of A. urmiana and result in lower survival and reproductive performance of the animal..
S. Hajinezhad, A. Imani, F. Noori, K. Sarvi Moghanlou, Volume 26, Issue 4 (11-2017)
Abstract
Imbalanced dietary fatty acid profile could influence the performance of larvae. In the present study the effect of various dietary levels of HUFA and PUFA (C18) on histoarchitecture of newly weaned rainbow trout (Oncorhynchus mykiss) larvae were investigated. To this end, various dietary HUFA levels (0, 0.5, 1 and 2 percent) at a fixed dietary PUFA of 20 percent (the first experiment) and various dietary PUFA levels (10, 20, 30 and 40 percent) at fixed dietary HUFA of 8 percent (the second experiment) were created and fed to larvae. The experiments were lasted for six weeks. At the end of the experiments, six fish were randomly taken and the proximal intestine was dissected out and fixed for histological studies. According to lipid epithelial disorganization and cell lifting along with frequency of enterocyte fat stores of proximal intestine of fries, it could be stated when dietary PUFA was fixed at 20 percent (mainly due to replacing dietary fish oil with plant sources), there is no way to prevent such deteriorative histological alterations except increasing dietary HUFA levels up to 2 percent of dietary lipid content. In the second experiment, increasing dietary PUFA to 40 percent of dietary lipid content improved proximal intestine integrity. Furthermore, the lowest goblet cells counts and consequently the highest number of enterocytes, or intestinal absorptive cells, were recorded in treatment 3 and 6. Concludingly, in those groups feeding on diet containing 20 percent PUFA with 2 percent HUFA or 40 percent PUFA with 8 percent HUFA lower lipid vacuoles were present and normal intestinal epithelia were observed.
D Sepehrfar, K Sarvi Moghanlou, S.h Hoseinifar, H Kolangi Miandare , Volume 26, Issue 5 (1-2018)
Abstract
This study was conducted to investigate the effects of Pediococcus acidilactici and Agaricus bisporus administration on some blood and non-specific immune parameters of common carp ( Cyprinus carpio). The total number of 180 fish with average weight of 19.06±0.69 g was adapted to laboratory conditions for 2 weeks. Afterwards, they were divided into 12 fiberglass tanks with the density of 15 fish in a tank. The study was performed in a complete randomize design for 2 months using 4 dietary treatments including the commercial diet (control group), commercial diet supplemented with P. acidilactici (0 /9 ×10 7 CFU/g), commercial diet supplemented with mushroom powder (10 g/kg), and commercial diet supplemented with the combination of P. acidilactici (0 /9 ×10 7 CFU/g) and mushroom powder (10 g/kg). At the end of the study, the results indicated that there was no significant difference in the number of red blood cells (RBC) among various groups. The highest levels of hemoglobin )8/15 ±0/37)(g/dL), MCV, 223/63 ±23/77(fL), MCH, 56/21 ±5/31(pg) and the lowest amount of white blood cell count, 9/73 ±1/00 ( ×10 3 cell/ml) were observed in the synbiotic group (P<0.05). Furthermore, hematocrit (32/43 ±1/69%) and MCHC (25/17 ±1/06 %) showed a slight increase in the synbiotic treatment compared to the control group (P>0.05). Significant differences in the total immunoglobulin, lysozyme activity and ACH50 were not found among various experimental groups (P<0.05). In conclusion, the commercial diet supplemented with the combination of the probiotic (0 /9 ×10 7 CFU/g) and prebiotic (10 g/kg) improved some blood parameters in common carp.
M. Pourahad Anzabi, K. Sarvi Moghqanjou, B. Atashbar, A. Mohammadyari, Volume 26, Issue 6 (3-2018)
Abstract
Due to the progressive drying of Urmia Lake, applying appropriate management strategies and providing a suitable solution for the management of hydrological regimes in the satellite wetlands around this lake such as the Sulduz Wetland is necessary. The Sulduz Wetland is located in the West Azerbaijan Province and in the southern part of Urmia Lake. The Sulduz Wetland is ecologically important. The present study was conducted to investigate the role and the effect of physicochemical factors of water on the crustacean zooplankton communities. Sampling was performed seasonally from November 2015 to July 2016. Two groups of crustacean zooplankton including Copepoda and Cladocera were observed. The results of statistical analysis of CCA showed a positive correlation between the existence and density of most of the genera with the temperature, turbidity, soluble solids, dissolved oxygen, phosphate and alkalinity, whereas same genera showed a negative correlation with depth, salinity, electrical conductivity, transparency and pH. Low water temperature in the autumn and in the winter was the main factor in reducing the density of zooplankton in this wetland. Results of CCA analysis showed that the presence and density of identified genera were related to each other and to the physicochemical parameters of water. In conclusion, it can be said that in the Sulduz Wetland like many other habitats of the world, distribution patterns of zooplanktons were strongly influenced by environmental factors.
F. Khodabandeh, K. Sarvi Moghanlou, S. Khodabandeh, Volume 27, Issue 1 (5-2018)
Abstract
In the present study, the effects of enrichment of Artemia franciscana with fish oil and soybean oil accompanied with vitamin E were investigated on the structure of pyloric caeca in Persian sturgeon (Acipenser persicus) larvae. A total of 1500 Persian sturgeon larvae (with the average weight of 51±2 mg) were divided into 15 tanks. Larvae were fed for 17 days in 5 experimental treatments including the treatment C (non-enriched artemia), S15 (enriched artemia with soybean oil and 15% vitamin E), S30 (enriched artemia with soybean oil and 30% vitamin E), F15 (enriched artemia with fish oil and 15% vitamin E) and F30 (enriched artemia with fish oil and 30% vitamin E). From each traetment, 15 larvae were collected and were fixed in Bouin’s solution for histological studies. Histological results showed that both fish oil and soybean oil were the main and effective factors on the total area and histo area indices of the pyloric caeca and the enrichment of artemia with fish oil and soybean oil was significantly increased this factor as compared to that of the control treatment (P<0.05). Fish oil was approximately two times more effective than soybean oil on the total area index of of the pyloric caeca. Furthermore, vitamin E was the main factor that affected the enterocyte numbers of the pyloric caeca. Increasing the amount of vitamin E was significantly decreased the number of enterocytes as compared to that of the control group (P<0.05). In conclusion, the enrichment of artemia with fish oil and with the appropriate amounts of vitamine E could have positive effects on the enterocytes of pyloric caeca and could improve ion regulation in the Persian sturgeon larvae.
R. Jenabi Haghparast, K. Sarvi Moghanlou, M. Mohseni, A. Imani, Volume 27, Issue 5 (1-2019)
Abstract
The present study conducted to evaluate the effects of soybean lecithin on growth indices, body composition, digestive enzymes activities and intestinal histomorphometry of Caspian salmon. Ninety fish (350g ± 10) were randomly divided into three treatments with three respective replicates. The first treatment (control group) was fed with commercial feed, while the second group received diet supplemented with 12% soybean oil, and the third one received feed supplemented with 6% soybean oil and 6% soybean lecithin for 90 days. Weight gain was indicative of the statistical superiority of treatment 3 over control group and treatment 2. In addition, FCR of treatment 3 was only significantly different from control group (p≤0.05). There were significant differences regarding moisture content of treatments 2 and 3 in compare to control group (p≤0.05), however, protein and lipid contents of treatments were not significantly different (p≤0.05). Furthermore, energy contents of treatments 2 and 3 were significantly different (p≤0.05). Digestive enzymes activities (protease, lipase and amylase) of treatment 3 significantly differed from treatment 2 and control group (p≤0.05). Morphometric characteristics of intestine including epithelium thickness and external muscle thickness of treatments 2 and 3 were significantly different from those of control group (p≥0.05). In conclusion, supplementing Caspian salmon diet with 6% soybean lecithin improved growth and some physiological parameters of the fish.
Z. Mahmoudikia, A. Imani, K. Sarvi Moghanlou, M. Razi, Volume 28, Issue 1 (5-2019)
Abstract
The effect of stocking density and dietary aflatoxin B1 along with including rosemary and thyme powders on digestive enzymes activity of rainbow trout was evaluated. 600 fish with an average weight of 90±3 were randomly allotted into six experimental groups consisted of (1) stocking at 15 kg.m-3- feeding diet devoid of aflatoxin, (2) stocking at 45 kg.m-3-feeding diet devoid of aflatoxin, (3) stocking at 15 kg.m-3-feeding diet containing 50 ppb aflatoxin, (4) stocking at 45 kg.m-3-feeding diet containing 50 ppb aflatoxin, (5) stocking at 15 kg.m-3-feeding diet containing 4% rosemary and thyme powder and 50 ppb aflatoxin and (6) stocking at 45 kg.m-3-feeding diet containing 4% rosemary and thyme powder and 50 ppb aflatoxin. Activity of alkaline protease, lipase and amylase was only affected by fish stocking density to the extent that those fish were reared in higher density showed increased digestive enzymes activity (p<0.05). Interactive effect of two studied factors (stocking density and dietary supplementation of medicinal plants) significantly affected activity of amylase and alkaline protease. However, lipase was only affected by dietary supplementation of medicinal plants. The highest amylase and alkaline protease activity were recorded in those fish received diet devoid on medicinal plants and stocked at 45 kg.m-3 (p<0.05). Those fish received diet containing medicinal plant powder significantly had lower activity (p<0.05). Proximal intestine histological examinations revealed that those fish stocked at higher density and received aflatoxin contaminated diet had villi detachments. Nevertheless, dietary inclusion of herbal blend consisted of rosemary and thyme powder could retrieve such tissue abnormality. It seemed that intestine could resist tension from higher stocking density or dietary aflatoxin contamination; however, their combination was not endurable for fish. Meanwhile, further complementary researches such as assaying antioxidant enzymes activity are warranted to precisely elucidate the underlying mechanism behind such alterations.
L. Farzollahi, K. Sarvi Moghanlou, A. Imani, Volume 28, Issue 1 (5-2019)
Abstract
The aims of present study were to investigate the effects of Chicory (Cichorium intybus L.) and Hypericum perforatum extracts on immune indices and antioxidant enzymes activity of rainbow trout (Oncorhynchus mykiss). For this purpose, 720 fish with an average weight of 100±5 g were randomly allocated to four distinct treatments including: a control group, 3% chicory extract, 3% extract of H. perforatum and combined treatment containing 1.5% chicory extract and 1.5% extract of ) H. perforatum). The experiments lasted for 12 weeks. Immune parameters including lysozyme, alternative complement activity and total immunoglobulin content of serum along with the activity of antioxidant enzymes namely catalase, superoxide dismutase and glutathione peroxidase were measured. Our results showed that dietary supplementation of 3% chicory extract significantly increased total immunoglobulin and lysozyme enzyme activity compared to the control group (p<0.05). The highest level of alternative complement activity was observed in simultaneous supplementation of 1.5% chicory and 1.5% H. perforatum extract (p<0.05). Also, single and combined dietary inclusion of both herbal extracts resulted in increased SOD and GPX enzymes activity in comparison to control group received diet devoid of any herbal extract (p<0.05). In addition, the highest and lowest activity of catalase was observed in the control group and 3% H. perforatum, respectively (p<0.05). In conclusion, dietary inclusion of 3% Chicory extract would improve the immune indices and including 3% H. perforatum extract increased the antioxidant enzymes activity of rainbow trout.
B. Sarvi, Gh.r. Rafiee, J. Ghofleh Marammazi, M. Zabayeh Najafabadi, S.h. Seyedalhosseini, Volume 28, Issue 5 (12-2019)
Abstract
In this study reproductive biology of brood stock and larvae rearing technique of Acanthopagrus latus was investigated. Also, different development stages of the egg and larvae in a period of 42 days are described. The diameters of fertilized eggs were 0.77-0.85 mm. The eggs hatched in 32 h between 19-21◦C. The newly hatched out larvae had mean body weight of 84.6 µg and total length of 1.76-1.87 mm. At the end of this study period, yellowfin seabream larval reached to 5170 µg mean body weight and standard length of 12.1-12.6 mm. Gulping the air and swim bladder inflation occurred during first week of larval life, especially as from the sixth day after hatching. In the current study larvae were able to ingest and digest rotifer, Artemia nauplii and microparticulate diet successfully. High mortality of larvae was observed between days 20 and 30 after hatching. Average survival rate of larvae was around %43, when the study finished at day 42 after hatching. The techniques used in this research to deal with yellowfin seabream brood stock and larvae were found to be suitable and led to successful spawning and larval’s metamorphosis into fry in captive condition.
Faraz Panjvini, Kourosh Sarvi Moghanlou, Raheleh Tahmasebi, Ahmad Imani, Volume 31, Issue 3 (9-2022)
Abstract
In this study, the effects of dietary addition of vitamin C, astaxanthin, and lecithin on the fertility ability (percentage of fertilization and eyed-eggs) and activity of SOD, CAT and GPx in the ovarian fluids of Caspian trout (Salmo caspius) were investigated. For this purpose, nine different experimental diets: C0A0L0 (0 mg kg-1 vitamin C, 0 mg kg-1 astaxanthin and 0% soybean lecithin), C300A50L0, C700A100L0, C0A50L6, C300A100L6, C700A0L6, C0A100L9, C300A0L9, and C700A50L9 were formulated and the broodstocks (2.51±0.05 kg) were fed for four months. After sexual maturation and spawning, the ovarian fluids were isolated to measure the activity of antioxidant enzymes (AAE) and to evaluate its fertilization ability. The sperm mixture of 9 male broodstocks was used to measure fertilization ability. The results showed an increase in the relative fecundity and AAE in ovarian fluid. The lowest relative fecundity (680±38 eggs per Kg of broodstock weight) and SOD, CAT, and GPx (816.33±67.60 u/ml, 1.29±0.40 nmol/min/ml and 1.06±0.08 nmol/min/ml, respectively) were observed in C0A0L0 which significantly different from other treatments (p<0.05). The highest percentage of fertilization and eyed-eggs were obtained in C300A100L6 (91.66±5.13% and 87.63±1.3%, respectively) which significantly different from the freshwater treatment (77.66±4.16% and 47.86±5.1%, respectively; p<0.05). According to the results of this research, adding of 300 mg kg-1 vitamin C with 100 mg kg-1 astaxanthin and 6% lecithin can increase the relative fecundity, fertilization ability and AAE in ovarian fluids of Caspian brown trout.
Mojtaba Pourahad Anzabi, Kourosh Sarvi Moghanlou, Ahmad Imani, Raheleh Tahmasebi, Volume 31, Issue 5 (12-2022)
Abstract
The present study aimed to evaluate the protective effect of vitamins E and C on reducing the effects of dietary oxidized fish oil on the growth, hematological and biochemical indices of rainbow trout fry. For this purpose, 240 fries with an average weight of 12.75±0.25 g were fed with 4 treatments including, treatment 1: a diet containing fresh fish oil, treatment 2: a diet with oxidized fish oil, treatment 3: a diet containing oxidized fish oil along with the low level of vitamin supplements (100 mg/kg vitamin E, 200 mg/kg vitamin C) and treatment 4: a diet with oxidized fish oil along with the high level of vitamin supplement (200 mg/kg vitamin E, 400 mg/kg vitamin C) for 60 days. At the end of the trial, the indices of specific growth rate (SGR), weight gain percentage (WG), and food conversion ratio (FCR) were calculated. Also, the hematological and serum biochemical parameters: cholesterol, triglyceride, high density lipoprotein (HDL), and low density lipoprotein (LDL) were measured. Based on the obtained results, the SGR and WG, were decreased in 2, 3 and 4 treatments and the FCR was increased (p<0.05). The white blood cells (WBC), red blood cells (RBC), hemoglobin (Hb), and hematocrit (Htc) levels were increased in 2, 3, and 4 treatments (p<0.05). The triglyceride and HDL contents were increased in 3 and 4 treatments, respectively (p<0.05). Also, there were not significant differences between different treatments for serum cholesterol and LDL indices (p>0.05). Finally, it was concluded that oxidized fish oil has adverse effects on growth, hematological and biochemical indices, and the vitamin supplements are effective in reducing these effects on the hematological and biochemical parameters.
Rahimollah Bakhtiari, Kourosh Sarvi Moghanlou, Behrooz Atashbar Kangarloei, Ahmad Imani, Mojtaba Pourahad Anzabi, Volume 32, Issue 1 (4-2023)
Abstract
Regarding the use of cypermethrin insecticide in agriculture in West Azerbaijan and the possibility of its entry into the Urmia Lake, the present study was conducted to investigate the effect of cypermethrin on growth, survival, and some physiological parameters of Artemia urmiana. For this purpose, the LC50 of cypermethrin for 24, 48, and 96 hours in the nauplii, post-larva, and adult stages were obtained using the probit test. The average LC50 of 96 hours was used to study the effect of chronic toxicity. Then, the Naplii was cultured in 4 treatments including the control group, 25% LC50, 50% LC50, and 100% LC50 for 15 days. At the end of the experiment, growth, survival, antioxidant enzymes activity, and digestive enzymes activity of the whole body were evaluated. The results showed that different concentrations of cypermethrin decreased the growth and survival of A. urmiana (p<0.05) and the amount of this decrease depended on the age of Artemia and the exposure duration. The highest decrease in growth and survival of different life stages of A. urmiana was observed in the 100% LC50 group. The results of antioxidant enzymes activity showed that cypermethrin decreased the levels of superoxide dismutase, catalase, and malondialdehyde (p<0.05), but there was no change in the activity of glutathione peroxidase (p>0.05). Also, the activities of lipase and alpha-amylase enzymes were decreased (p<0.05), but no significant difference was observed in the alkaline protease activity (p>0.05). In conclusion, the cypermethrin insecticide decreased the growth, survival, and antioxidant and digestive enzymes activities in A. urmiana.
Negin Bagherzadeh, Ahmad Imani, Kourosh Sarvi Moghanlou, Mohammad Mohammadi, Volume 32, Issue 2 (7-2023)
Abstract
The present study was carried out to investigate the effect of different dietary levels of fermented canola meal by the Bacillus isolated from Caspian Sea sediments on growth and nutritional indices, proximate body composition, and digestive enzymes activity of Nile tilapia fingerlings. A total of 225 fry fish with an average weight of 1.90±0.05 g were fed with five different experimental diets including treatment 1: a diet without fermented canola, treatment 2: a diet containing 12.5% fermented canola, treatment 3: a diet containing 25% fermented canola, treatment 4: a diet containing 37.5% fermented canola, and treatment 5: a diet containing 50% fermented canola for 8 weeks. Results revealed that the growth and nutrition indices did not significantly differ among various experimental groups (p>0.05). Proximate analyses of the body composition showed that the protein contents of treatments 2, 3, and 4, the lipid and moisture contents of treatments 3, 4, and 5, and also the ash contents of treatments 4 and 5 were increased compared to the control group (p<0.05). Also, the results of digestive enzymes activity showed that the alkaline protease activity of treatments 3 and 4, lipase activity of treatments 2 and 3 and also the alpha amylase activity of treatment 3 were increased in comparison with the control group (p<0.05). In general, it was concluded that incorporating 50% of fermented canola did not affect growth performance and nutritional indices in Nile tilapia fingerlings.
|
|