Showing 6 results for Nafisi
Volume 5, Issue 2 (9-2016)
Abstract
In the current study, the effect of fresh water and different salinities of 15, 35 and 50 ppt on growth, feeding, body composition, glucose and cortisol in Asian sea bass (Lates calcarifer); were investigated. 180 fingerlings with average weight of 34.36±0.41 gram in 12 circular fiberglass tanks with 300 liter volumes were administered. Feedinng was done to satiation twice a day for 30 days. At the end of the experiment, biometry carried out and plasma and carcass samples were collected for estimating blood biochemical parameters and whole body composition. The obtained results showed that freshwater treatment had a significant difference in growth and feeding performance with other treatments (p < 0.05). Also, the results of carcass analyze showed that freshwater treatment moisture percentage was significantly higher (72.07±0.11) compared to other treatments (p < 0.05). Glucose and cortisol value in 15 ppt treatment were significantly higher at 35, 50 ppt treatment and 35 ppt, freshwater treatment, respectively (p < 0.05). Overall, this study showed this species is able to tolerate changes in salinity in the surrounding medium from seawater to brackish water through a period of 30 days and successfully adapt to freshwater without showing mortality. But, it could not be a good case for culture in fresh water because of using high energy for osmoregulation in fresh water.
Volume 5, Issue 4 (3-2017)
Abstract
This experiment was conducted to determine the effects of three binding agents, including corn starch, carboxymethyl cellulose (CMC) and urea formaldehyde (UFA) (in diets containing 42% soybean meal) on growth performance, pellet water stability and chemical composition of Litopenaeus vannamei. Shrimps with an average initial weight of 0.73 g stored in polyethylene tanks and fed experimental diets for 52 days (four treatments and three replicates). Biometric measurements of shrimp were carried out in two periods of 15 and 21 days. At the end of experiment results showed that the average final weight of shrimp fed the UFA binder is significantly lower than other treatments (p<0.05). Specific growth rate at three sampling periods (p<0.05) and at the end of experimental (p<0.01) was significantly affected by the type of binder, with the lowest SGR in UFA and highest in shrimps were fed control diet. Statistical analysis showed that chemical body composition of shrimp was not significantly affected by dietary treatments. In general, according to the results of diet stability, growth performance and feed utilization as well as shrimp body composition, corn starch is a good binder for whiteleg shrimp feed.
Volume 7, Issue 4 (Fall 2018)
Abstract
The use of environmentally friendly methods is one of the new approaches in combating pathogens in aquaculture systems. The purpose of this research was the possibility evaluation of indirect use of Ag-NPs-coated porous ceramic in water filtration of culture system of shrimp post-larvae to control Vibrio harveyi. In this study, Ag-NPs-coated filters were characterized by various analytical techniques such as FTIR, XRD, ICP, and SEM. In this study, the antibacterial activity of Ag-NPs-coated on porous ceramic against mentioned bacteria via in vitro experiments Zone of inhibition test and Test tub test were determined. Then porous ceramic filter media used for water treatment. Therefore, the performance of the Ag-NPs-coated on porous ceramics in removing pathogenic bacteria was studied in two phases: In the first phase, V. harveyi was inoculated to the water and efficacy of filters of inhibition of bacteria was evaluated via total count of bacteria in the test water; in the second phase, the performance of the Ag-NPs-coated on porous ceramic was tested in the presence of shrimp larvae and efficacy of filters in inhibition of bacteria was evaluated via total count of bacteria, mortality rate, clinical signs, and also hepatopancreas and muscle culture. Based on the results, the highest zone of inhibition obtained in presence of Ag-NPs-coated porous ceramic modified by an aminosilane coupling agent, 3-Amino-Propyl-Triethoxysilane (APTES; the samples were immersed in the silver colloidal solution for 24h). The results of the flow test showed the highest bacteria removal efficiency from water with complete removal of the targeted pathogen. In the second phase, the results indicated a significant difference in decreasing of water bacteria, shrimp mortality and disease symptoms in treatment containing silver compounds compare to controls. According to results, Ag-NPs-coated porous ceramic have a high bacteria removal efficiency for the disinfection of water of culture system of shrimp to control Vibrio harveyi.
Volume 9, Issue 18 (Fall & Winter 2023)
Abstract
The relationship between the condition "If you fear that you may not maintain justice with orphan girls" and the answer "Then marry women of your choice – two, three, or four" in the al-Nisāʼ/3 is one of the interpretative challenges which caused many translation differences. This condition structure has 7 different translations, focusing on the equivalences of "women, desirable women, orphaned and non-orphaned women, orphan mothers, mature women, women fit in with justice and non-orphan women In the meantime, a criterion for preferring and criticizing translations is needed to have the power to understand and analyze interpretive votes because of the dependence of translation on interpretation. To this aim, was used the analytical-descriptive and Surah’s structural analysis method, in which the Surah is as an intertwined network of different topics with focusing on the contexts. . By this criterion, the seventh species is chosen as the selected translation and can be presented as follows: "If you are afraid that you will not treat orphans in installments, marry women (other than orphans) in two, three and four." Therefore, the crucial achievement of this paper can be considered as providing an in-textual criterion for illuminating the proposed translations for the text of the Qur'an. Therefore, using the verse, context, chapter, surah structures and its intention is the basis for evaluating translations and providing correct translation. Implementation of this method of translation criticism on long Sura al-Nisāʼ in the present study will be an example to prove the constructive effect on criticism and preference of translations throughout the Qur'an.
Volume 25, Issue 3 (5-2023)
Abstract
Asian sea bass (Lates calcarifer) an important marine species of high economic value and excellent meat quality, has suffered great losses due to disease in high-density aquaculture. The macroalgae, Gracilaria pygmaea, which include various bioactive compounds, may serve as an immunostimulant in the aquaculture industry. This study aimed to assess the effect of dietary fish meal replacement with Gracilaria pygmaea meal on immunity, activity of liver antioxidant enzymes, intestinal tissue, lysozyme gene activity, and IGF-I gene activity in Asian sea bass (Lates calcarifer). To this end, 120 individuals of Asian sea bass with an average weight of 28±0.5 g were divided into four treatments and three replicates and kept in 12 tanks (10 fish per 300-liter tank). Blends of soybean meal and fish meal were used as a Control diet (C). Experimental diets were prepared to substitute the fish meal with 3 (GL3), 6 (GL6), and 9% (GL9) of G. pygmaea in the basal diet. Fish were fed three times daily for six weeks. Dietary supplementation of G. pygmaea led to significantly increase in total immunoglobulin level compared to the control. The inclusion of G. pygmaea in the diet did not affect the antioxidant status of the fish. The histological analysis showed that fish of all groups exhibited normal morphology of anterior intestine and pyloric caeca. The obtained results showed that fish of GL9 and the control groups had the highest IGF-1 mRNA transcript abundance in the liver compared to the other groups. The changes of lysozyme expression noticed among the groups were statistically insignificant. Overall, the results obtained in this study indicated that dietary G. pygmaea did not cause adverse effects on immune status, antioxidant status, intestinal morphology, and lysozyme gene activity in Asian sea bass.
Volume 27, Issue 3 (3-2025)
Abstract
This study evaluated the interactive impacts of water temperature and feeding rate on digestive enzymes, intestine histology, growth and stress-related genes, and cultivable intestinal microbiota of Asian seabass (Lates calcarifer). For this purpose, 180 fish (85.0±3.0 g) were reared at three different temperatures (20, 27, and 33°C) and two feeding rates (apparent satiation and 2.5% of biomass) with three replications for 6 weeks. The results revealed no significant differences among different treatments regarding the activity of digestive enzymes (P˃ 0.05) of fish reared under different temperatures and feeding rates. The length, width, and thickness of intestinal villi were unaffected by different temperatures and feeding rates (P˃ 0.05). In addition, no variations were found in the total aerobic bacterial count of fish gut from different experimental groups (P˃ 0.05). At the molecular level, IGF-I and HSP70 coding genes were found to be highly expressed in experimental treatments (P< 0.05). To conclude, the present study showed that temperatures between 27 to 33°C were more optimal for Asian seabass, and the different temperatures and feeding rates did not affect the digestive enzymes, intestine histology, and gut microbiota of juvenile Asian seabass after 6 weeks.
