XML
-
-
List of Articles
-
Open Access Article
1 - Growth performace of silver carp (Hypophthalmichthys molitrix) fed by Diatoma microalgae in the pond
Fatemehsadat TahamiAbstractThe common method of fertilizing to increase live food (microalgae) in Hypophthalmichthys molitrix ponds has disadvantages, including the fact that fertilizers increase the population of microalgae of all types (toxic and non-toxic) without human control and thu MoreAbstractThe common method of fertilizing to increase live food (microalgae) in Hypophthalmichthys molitrix ponds has disadvantages, including the fact that fertilizers increase the population of microalgae of all types (toxic and non-toxic) without human control and thus can cause growth. Unwanted to become harmful algae. This study was carried out at the same time with the beginning of the summer season and breeding of silver carp juveniles, with the aim of enriching the microalgae composition of warm-water fish breeding ponds located in Mazandaran province. Growth rate was calculated according to the treatments. 100 young juveniles of 90 g silver carp were stored in each pond. This study was carried out at the same time with the beginning of the summer season and breeding of silver carp juveniles, with the aim of enriching the microalgae composition of warm-water fish breeding ponds located in Mazandaran province. Growth rate was calculated according to the treatments. 100 young juveniles (90 g) of Silver Carp were stored in each pond. Expeiments were performed in circular concrete ponds with a diameter of 6 meters and a water height of 1 meter with 3 treatments. Different microalgae compositions (treatments 1: 70% chlorella, 30% diatoma, 2: 70% diatoma, 30% chlorella and 3: control treatment of natural algae composition of the area) wee fed ding the experiment. In this study, the growth rate of silver carp in different densities of Diatoma and Chlorella algae was evaluated in combination with different percentages in the pond environment and at the end of the experiment, survival percentage, fish growth rate, specific growth rate and average daily growth were calculated. Ponds whose fish were water-enriched with Diatoma microalgae with a density of 70% had higher growth (survival rate, fish growth rate, and specific growth rate and aveage daily growth). Also, according to this study, since one of the conditions for having a healthy farmed fish is to have a healthy and proper nutrition, so it is necessary to increase the share of edible microalgae Diatoma in the breeding environment of these fish to produce more and higher quality of these fish acquired. Manuscript profile -
Open Access Article
2 - Optimization of mixotrophic culture medium for maximum production of extracellular polysaccharides and bioactive compounds Aliinostoc oryzae cyanobacteria isolated from saline water of Golestan province
بهاره NowruziAbstractThe synthesis of extracellular polysaccharides in microorganisms, especially cyanobacteria, plays a major role in protecting the cell against many stresses in different habitats. In recent years, cyanobacterial strains belonging to the Nostocaceae family are of MoreAbstractThe synthesis of extracellular polysaccharides in microorganisms, especially cyanobacteria, plays a major role in protecting the cell against many stresses in different habitats. In recent years, cyanobacterial strains belonging to the Nostocaceae family are of interest as acceptable sources for polysaccharide production in liquid and solid suspension cultures. Therefore, in this research, the optimization of culture conditions for maximum production of extracellular polysaccharides and bioactive compounds under the influence of mixotrophic environment by filamentous cyanobacteria isolated from salt water has been studied. In the upcoming study, with the aim of investigating the effective factors in optimizing the production of exopolysaccharides and the effect of the mixotrophic environment, the cyanobacterium Aliinostoc oryzae strain was isolated from the salty waters of Golestan province, and after morphological and molecular identification, the amount of polysaccharide produced and its antimicrobial activity was investigated. The findings indicate that the amount of polysaccharide production from cyanobacteria depends on the conditions of the culture environment. The amount of polysaccharide production of cultures grown in nitrate concentration with concentrations of 0.04 and 0.06 g/ml and in light of 150 microns per square meter per second was significantly higher than the control. Antibiogram tests also showed that there was a significant difference in polysaccharide production in the presence of Staphylococcus aureus in nitrate culture. Investigations of the average production of extracellular polysaccharide extraction also showed a significant difference in different culture environments. Extracellular polysaccharide extracted from cyanobacteria has countless uses in the industry, including the pharmaceutical industry, food industry, and agriculture. Therefore, the optimization of the cyanobacterium culture conditions for the maximum production of polysaccharides appears. Since cyanobacterial exopolysaccharides are important from the point of view of biotechnology, it is important to pay attention to many other factors for maximum exopolysaccharide production in this genus of cyanobacteria. Manuscript profile -
Open Access Article
3 - Ligula intestinalis (Cestoda: Pseudophyllidea) plerocercoids in Alburnoides eichwaldi from Alborz Dam reservoir: population dynamics and histopathological study
Abbas BozorgniaAbstract The aim of this study was to determine the prevalence and intensity of Ligula intestinalis infection in Alburnoides eichwaldi from the Alborz dam reservoir, and investigation the histopathology of infected organs. Accordingly, 36 fish samples were caught. After MoreAbstract The aim of this study was to determine the prevalence and intensity of Ligula intestinalis infection in Alburnoides eichwaldi from the Alborz dam reservoir, and investigation the histopathology of infected organs. Accordingly, 36 fish samples were caught. After being anesthetized, the biometric indices of fish samples were measured and examined for parasites. The tissue samples of gonads, kidney, liver and intestine were taken from parasite-infected fish to examine pathologically. Excel software was used to draw graphs and basic statistical calculations, and SPSS software version 26 was used to perform analyzes and compare means. The findings of statistical analysis indicated that the mean prevalence of Ligula intestinalis infection was 75% and the mean intensity was 0.95±0.7. Also, a significant difference (p<0.05) was observed between the total length of the fish and the total number of plerocercoid larvae found in each fish. Also, the linear regression analysis between the net weight of fish and the mean intensity of infection demonstrated a significant relationship (p<0.05) between the variables. The histopathological survey revealed that the physical pressures caused by plerocercoid larvae induced the oocyte envelope to rupture and degenerate the component of oocytes, while in the testis led to the loss of structural organization and the reduction of spermatids and spermatozoa inside the seminiferous tubes. Also, plerocercoid larvae cause vacuolar degeneration, edema, and cell infiltration in the liver along with hyperplasia of the bile ducts. Whereas, hyperplasia and destruction of the epithelial layer were seen in the intestine. Manuscript profile -
Open Access Article
4 - Dominant bacterial flora of gut in Rainbow trout and probable important viewpoint probiotic
علیرضا MobarhanfardAbstractThis research conducted for recognition of dominant bacterial flora of rainbow trout gut. 20 fingerlings of trout with average weight of 2gr, prepared by Isfahan Fisheries Authority in last winter. The stock of fish reared isolation tank, and during four months MoreAbstractThis research conducted for recognition of dominant bacterial flora of rainbow trout gut. 20 fingerlings of trout with average weight of 2gr, prepared by Isfahan Fisheries Authority in last winter. The stock of fish reared isolation tank, and during four months of rearing period, neither any disinfections nor antibiotic agents have been used. The temperature of farming tank maintained at the range of 10 to 16. After this period, the stock of fish pocked in ewo layer bags and transported at night time to lobaratory of science and Research Unit of Azad University in Tehran. All samples of fish arrived at healthy condition to laboratory. The average weight of fish measured as 30 10g, and total length of 8-12 cm. After word, the fish disinfected by 70% alcohol, and them by the strile apparatus the gut have been removed for primary and subtractive culture. The media used for culture was N.A, M.A, TSI, SIM, and recognition of positive or negative grams carried by staining. In addition, biochemical reagents like methyl red, oxidase – catalase test, sugar fermentation test, gelatin hydrolysis test and starch hydrolysis test for final recognition of bacteria and abundance ratio is carried out. Edwardzillata sp.(8%), itrobacrer sp. (10%), Shewanella sp.(30%), Haemophilus sp.(2%), Plesiomonas sp.(25%), Aero,onas sp.(25%) Dominant bacteria of gut flora in rainbow trout showed following species; Shewanella sp., Plesioonas sp. and Aeromonaa sp. Manuscript profile -
Open Access Article
5 - Gorgan Bay plankton flourishing status in the field of Miankale death in February 2020
taher poursufiAbstractCase sampling was performed in the winter of 2020 in the eastern region of Gorgan Bay in three coastal and central regions to investigate the causes of bird death. For this purpose, algal (macro and micro), zooplankton and water communities were sampled. The res MoreAbstractCase sampling was performed in the winter of 2020 in the eastern region of Gorgan Bay in three coastal and central regions to investigate the causes of bird death. For this purpose, algal (macro and micro), zooplankton and water communities were sampled. The results showed that a total of 44 species of phytoplankton were identified. 4 species equal to 12.5% and Euglenophyta branch with the lowest number with 2 species equal to 7.7% of the total species. The highest mortality was observed in Changar species and a few flamingos were observed. No algal blooms were observed during sampling. The density of cyanophytes was the lowest. Therefore, the cause of death of birds cannot be density or planktonic secretions. Manuscript profile -
Open Access Article
6 - Comparison of the chemical composition and fatty acids profile of wild carp (Cyprinus carpio) in natural and cultivated environments
sara jorjaniAbstract[1]The present paper aimed at evaluating nutritional value and fatty acid profile of muscle textures of Caspian Sea wild carp and farmed wild carp. No significant differences were found between chemical composition indices (total lipid, crude protein, moisture a MoreAbstract[1]The present paper aimed at evaluating nutritional value and fatty acid profile of muscle textures of Caspian Sea wild carp and farmed wild carp. No significant differences were found between chemical composition indices (total lipid, crude protein, moisture and ash contents) (P>0.05). Following determination of fatty acid profiles in the Caspian Sea wild carp and farmed wild carp, fatty acid compositions in two groups of fish were found to be significantly different in terms of various fatty acid groups and ratios. In both fish, Palmitic acid (C16:0) and Oleic acid (C18:1 ω-9 cis) were found to be the most abundant saturated and monounsaturated fatty acids, respectively. Saturated fatty acid (SFA), monounsaturated fatty acid (MUFA) and polyunsaturated fatty acid (PUFA) rates were estimated to be 26.71%, 52.57% and 17.68% in farmed wild carp and 22.78%, 40.53% and 25.06% in Caspian Sea wild carp, respectively. Oleic acid was significantly higher in farmed wild carp than the Caspian Sea one (P≤0.05). Linoleic acid (C18:2 ω-6) and decosahexaenoic acid (DHA, C22:6 ω-3) were the most abundant PUFA in farmed wild carp and Caspian Sea wild carps, respectively. ω-3 fatty acids were measured to be 15.79 and 6.16 gr/100 gr lipid in wild and farmed carps, respectively. ω-3 fatty acids content in Caspian sea wild carp was significantly higher than that of farmed wild carp (P≤0.05). ω-3/ω-6 ratio 1.69 and 0.76 in Caspian sea wild carps and farmed carps, respectively, that in both group exceeded the eligible rates proposed by nutritionists. PUFA/SFA ratios were 1.10 and 0.66 in Caspian sea wild carp and framed one, respectively; the rates exceeded the eligible rate (0.45) recommended by HMSO. Considering exceeding PUFA/SFA and ω-3/ω-6 ratios in both Caspian Sea wild carp and farmed wild carps, both fish were considered invaluable fisheries and nutritional resources. It is noteworthy that Caspian Sea wild carp is more nutritious than farmed counterparts thank to its higher rates of PUFA, ω-3, EPA+DHA, ω-3/ω-6 and PUFA/SFA. Manuscript profile
-
The rights to this website are owned by the Raimag Press Management System.
Copyright © 2021-2024