Department of Aquaculture (2015 - Present)
Aquaculture
, Tarbiat modares University , IRAN
Aquaculture
, Tarbiat modares University, IRAN
Aquaculture
, Tarbiat modares University, IRAN
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Fish consumption is on the increase due to the increase in growth of the global population. Therefore, taking advantage of new methods such as marine aquaculture can be a reliable source for the production of fish in the world. It is necessary to allocate suitable sites from environmental, economic, and social points of view in the decision-making process. In this study, in order to specify suitable areas for marine aquaculture by the Ordered Weighted Averaging (OWA) methodology in the Caspian Sea (Iran), efforts were made to incorporate the concept of risk into the GIS-based analysis. By using the OWA-based method, a model was provided which can generate marine aquaculture maps with various pessimistic or optimistic strategies. Eighteen mo
Spatiotemporal relationships between developmental stages (cydippid, transition and adult) of the comb jelly Mnemiopsis leidyi and environmental parameters were seasonally evaluated using the random forest (RF) model along the Iranian coasts of the Caspian Sea. The mean density of M. leidyi in spring, summer, autumn and winter were 8, 54, 130, and 15?ind?m−3, respectively. The density of various stages, particularly cydippid, showed a decreasing trend with increase in depth. Cydippids had the highest abundance with a lower percentage in the deeper layers and colder seasons. Temperature was found to be the most influential parameter on the distribution of M. leidyi’s life stages, particularly cydippids, with a stronger effect in spring a
The sulfur cycle is a complex biogeochemical process in aquatic ecosystems that involved four stages of mineralization, immobilization, reduction and oxidation. In organic matter-rich aquatic ecosystems especially aquaculture ponds, half of organic matter deposited under anaerobic condition by sulfate reducing bacteria and hydrogen sulfide gas produced as by product during this process. Small concentrations of hydrogen sulfides are highly toxic to aquatic organisms and therefore its production must be avoided. On the other hand, degrade of organic matter increases the amount of nutrients (e.g., nitrogen and phosphorus) in water, thus cause eutrophication of the ecosystems. Therefore, sulfur cycle has both positive and negative effect in aqu
This study was aimed to isolate and identify the most efficient native bacteria from warm-water fish farms of Mazandaran that can potentially oxidize hydrogen sulfide. After sampling the sediments and sediment pore water of fish farms in Fereydunkenar, Babol, Babolsar and Sari counties, enrichment and isolation carried out in three liquid culture media of Starkey, Postgate, and H-3 to increase the number of the desired microorganisms. After isolation based on morphological difference (in the above solid culture media), 27 isolates (14 autotrophic and 13 heterotrophic isolates) were purified. Then preliminary screening was performed based on pH decrease in Starkey liquid culture media, among which only 6 isolates were selected. In the next s
Aims: The present study aimed to evaluate the spatial patterns of water quality and its controlling factors in the Mazandaran coastal ecosystem during winter using the multivariate analysis methods. Materials & Methods: Water quality parameters such as nutrients, temperature, conductivity, salinity, DO, pH, chlorophyll‐a, and turbidity were measured monthly in 16 stations (44 layers) along 4 transects (Amirabad, Babolsar, Nowshahr, and Ramsar). To evaluate the data, several multivariate statistical methods were used including discriminant function analysis, cluster and factor analysis as well as correlation test. Findings: Using cluster analysis, sampling sites are classified into four distinct groups based on the similarity in water qual
see more details plays an important role in controlling primary productivity in warm-water fishponds. Concentration of water-soluble phosphate is often very low, since a large portion of soluble phosphate in fish ponds fish ponds Subject Category: Miscellaneoussee more details often bonds and forms insoluble complexes with calcium (Ca2+) and magnesium (Mg2+) in calcareous soils and with iron (Fe3+) and aluminum (Al3+) in acidic soils. Application of phosphate solubilizing bacteria phosphate solubilizing bacteria Subject Category: Organism Groups
The bio-availability of phosphorus for primary producers is reduced mainly due to the formation of complex with cations and organic matter in warm-water fish ponds. Therefore, the most important new approaches for increasing water-soluble phosphate that are consistent with the principles of sustainable agriculture are the use of phosphate solubilizing and mineralizing bacteria (PSB). For this purpose, sampling of the sediment of warm-water fish ponds in central regions of Mazandaran province was carried out. Isolation and identification of bacteria were performed using by National Botanical Research Institute (NBRIP) medium and 16s rRNA gene sequence. The ability of strains to grow in the range of environmental parameters of warm-water fish
The effects of dietary nucleotide (NT) were evaluat ed on some serum biochemical parameters and acute stress responses of the catfish ( Pangasianodon hypophthalmus ). Five experimental diets including 0, 0.25, 0.5, 0.7 5, and 1% NT were supplied to catfish fry for 10 weeks. At the end of the experiment, fis h fed the control and 1% NT diets were subjected to handling and crowding stress. The resu lts showed that the fish supplied with 0.25-0.75% NT had a lower level of lactate dehydrogenase (LDH ) (P<0.05) while other serum enzymes including alkaline phosphatase (ALP), asparate transaminase (ASP), and alanine transaminase (ALT) were not significantly r educed by NT inclusion
The relationships between life stages (nauplius, copepodite and adult) of Acartia tonsa with physicochemical parameters, and dominant planktonic species were investigated using Random Forest (RF) model along the Mazandaran Coasts during summer. Monthly sampling was conducted in 2012 along four transects (Amirabad, Babolsar, Noshahr and Ramsar) in different water layers at depths of 5, 10, 20 and 50 m. The results showed that the mean density of A. tonsa was1586 ind/m3. The spatial distribution of life stages showed that the density had decreasing trend from Ramsar, Amirabad, Babolsar to Noshahr, respectively. The density of each life stage of A. tonsa was also decreased with increase in depth and distance from the shore. Data evaluation thr
Seasonal distribution of phytoplankton and factors affecting their presence in the Mazandaran coastal ecosystems were investigated in 2012. In this study, Distribution of the phylum and dominant species of phytoplankton and water quality parameters were evaluated along 4 transects (Amirabad, Babolsar, Noshahr and Ramsar) in the different layers of the water column at final depths of 5, 10, 20 and 50m. Variation of the dominant species and environmental parameters was analyzed using Principal Components Analysis (PCA). Average annual phytoplankton density was 318687823 cubic meters, the highest density in winter and lowest in spring was determined. Totally, 5 groups and 129 species of phytoplankton were identified, including Bacillariophyta
Marine and coastal ecosystems have many benefits and different services for humans that marine aquaculture is one of the most important of these services. Southern coast of Caspian Sea particularly Mazandaran coast have great potential for development of marine aquaculture. Now, there are 9 fish farms with different production capacities in Mazandaran coast. In this study, the growth of specie of fish Rainbow trout (Oncorhynchus mykiss) was modeled using the marine aquaculture model based on daily temperature, rate of metabolism and mortality rate. Finally calculated the harvest weight and net present value (Net Present Value: NPV) for this this specie in each farm was calculated by considering two scenarios: 1) Development and 2) BAU (Busi
In this study, species composition, density and biomass of zooplanktons including Rotatoria, Protozoa and Meroplanktons were sampled using Juday net with mesh size of 100 ? at depths of 5, 10 and 20 meters in southern Caspian Sea (Babolsar) in two seasons of cold (Feb. 2015) and warm (June 2015). This study identified Asplanchna sp. and Synchaeta sp. from Rotatoria, and Balanus sp., Pelecypoda larvae, Balanus cypris and Nereis sp. larvae from Meroplankton. Globogeria sp. was the only protozoa observed in this study. Two way ANOVA analysis showed that sampling site and season had significant effect on density and biomass of zooplankton (P< 0. 05). Duncan's multiple range test showed that the density and biomass of zooplankton groups were sig
The aim of the present study was to investigate whether supplementary nucleotide “Optimun” mitigates the adverse effects of chronic overcrowding in Oncorhynchus mykiss. Two experimental diets [control and nucleotide-supplemented (0.2?%)] and two rearing densities (10 and 30?kg?m−3) were combined to have four experimental treatments. The fish were reared for 45?days under different densities using different diets. At the end of the trial, FCR of the fish in higher density was significantly higher than those of the lower density. Nucleotide had no significant effects on growth performance and survival rate. Supplemented nucleotide significantly increased blood hematocrit, whereas it decreased serum total protein, total im
An experiment was conducted to evaluate the effect of dietary nucleotide on growth performance and body composition of Nile tilapia (Oreochromis niloticus). Four experimental diets were formulated by using different levels of exogenous nucleotide consist of 0 (control), 0.05, 0.1, and 0.15 percent. Each diet was randomly allocated to triplicate groups of fish with initial average weight of approximately 52 g. Fish were fed on experimental diets during the 45 days of culturing period at the rate of 2-3% biomass two times per day. Results showed that some growth indices such as final weight, weight gain, daily growth rate and specific growth rate significantly increased by increasing nucleotide level, while feed conversion rate decrease by in
The present study was conducted to evaluate the effects of dietary nucleotides (NT) on growth performance, immune responses, and intestinal morphology of striped catfish, Pangasianodon hypophthalmus. Different levels of NT (0, 0.25. 0.5, 0.75, and 1% weight per weight, WW−1) were used in the basal diet and then randomly allocated to triplicate groups of fish with an average initial weight of 1.52???0.11?g for 10?weeks. Nucleotide supplementation did not improve growth parameters significantly (P?>?0.05). Feeding fish with a NT‐containing diet significantly improved ACH50 activity and IgM levels in comparison to the control group (P?0.05). The dietary NT (P?0.05) affected the intestinal morphology, whereby the folds and enterocyte h
The aim of this study was to assess the effects of nucleotide on intestinal microbiota of striped catfish, Pangasianodon hypophthalmus. Different levels of the NT (0, 0.25. 0.5, 0.75 and 1% weight per weight, WW-1) were added to basal diet and then randomly allocated to triplicate groups of fish with average initial weight (1.52?0.11 g) for 10 weeks. At the end of the experiment, at least 10 individual fish from each treatment were used to study quantitative and qualitative analyses of bacterial flora of intestine. The bacterial flora was identified to species level where possible. Total viable bacterial counts in the intestine of the catfish ranged from 4.33?0.49? 10 4, 5.98?0.82? 10 4, 6.44?1.09? 10 4, 5.54?0.64? 10 4 and 2.65?0.46? 10 4
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