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  • Aquaculture  (7)
  • Health  (2)
  • LU-factorization  (2)
  • 1
    ISSN: 1573-7691
    Keywords: Domain decomposition ; nested dissection ; LU-factorization ; time integration ; Newton's method ; spectral elements ; finite elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Domain decomposition by nested dissection for concurrent factorization and storage (CFS) of asymmetric matrices is coupled with finite element and spectral element discretizations and with Newton's method to yield an algorithm for parallel solution of nonlinear initial-and boundary-value problem. The efficiency of the CFS algorithm implemented on a MIMD computer is demonstrated by analysis of the solution of the two-dimensional, Poisson equation discretized using both finite and spectral elements. Computation rates and speedups for the LU-decomposition algorithm, which is the most time consuming portion of the solution algorithm, scale with the number of processors. The spectral element discretization with high-order interpolating polynomials yields especially high speedups because the ratio of communication to computation is lower than for low-order finite element discretizations. The robustness of the parallel implementation of the finite-element/Newton algorithm is demonstrated by solution of steady and transient natural convection in a two-dimensional cavity, a standard test problem for low Prandtl number convection. Time integration is performed using a fully implicit algorithm with a modified Newton's method for solution of nonlinear equations at each time step. The efficiency of the CFS version of the finite-element/Newton algorithm compares well with a spectral element algorithm implemented on a MIMD computer using iterative matrix methods.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7691
    Keywords: Domain decomposition ; nested dissection ; LU-factorization ; parallel computers ; MIMD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A multilevel algorithm is presented for direct, parallel factorization of the large sparse matrices that arise from finite element and spectral element discretization of elliptic partial differential equations. Incomplete nested dissection and domain decomposition are used to distribute the domain among the processors and to organize the matrix into sections in which pivoting is applied to stabilize the factorization of indefinite equation sets. The algorithm is highly parallel and memory efficient; the efficient use of sparsity in the matrix allows the solution of larger problems as the number of processors is increased, and minimizes computations as well as the number and volume of communications among the processors. The number of messages and the total volume of messages passed during factorization, which are used as measures of algorithm efficiency, are reduced significantly compared to other algorithms. Factorization times are low and speedups high for implementation on an Intel iPSC/860 hypercube computer. Furthermore, the timings for forward and back substitutions are more than an order-of-magnitude smaller than the matrix decomposition times.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2021-05-19
    Description: This survey carried out from 2012 to 2013 to study of suitable site selection for carp and trout fish species for responsible aquaculture possibility by data collection and literature study.During the survey ecological factors including physical and chemical factors,geological factors including topography and type of soil,biological factors including selection of species and control of invader animals,climatic factors,geographical factors and pollutant including heavy metals,agricultural pesticides Surfactants and crude oils were recognized.Also in comparing with standard levels suitable rate of each important factor in aquaculture were studied.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Warm Water ; Fish ; Cold Water ; Ecological factors ; Biological factors ; Aquaculture ; Survey ; Carp ; Species
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 33pp.
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  • 4
    Publication Date: 2021-05-19
    Description: The development of shrimp aquaculture, in spite of its global necessity, is largely at stake as significant ecological and pathological problems are increasing in the vast majority of the shrimp producing countries. Shrimp immunology is a key element in establishing strategies for controlling diseases in shrimp aquaculture. The total haemocyte count (THC), differential haemocyte count (DHC), total plasma protein (TPP), Phagocytic activity (PA), bacterial clearance efficiency (BCE) and bactericidal activity (BE) were examined when the F. indicus shrimps (11.32±1.20 g) were immersed in seawater (39 ppt and 25 ± 1 ○C) containing hot-water extracts of brown alga Sargassum glaucescens at 100, 300 and 500 mg/l. These parameters increased significantly (p 〈 0.05) when the shrimp were immersed in seawater containing hot-water extracts at 100 mg/l after 3h and 300 and 500 mg/l after 2 h. F. indicus shrimps that were immersed in hot-water extracts at 300 and 500 mg/l had increased phagocytic activity and clearance efficiency to Vibrio spp. after 2 hours. But bactericidal activity increased significantly after 1 hour in the same concentrations.
    Description: Published
    Keywords: Shrimp ; Fenneropenaeus indicus ; Sargassum glaucescens ; Total haemocyte count ; Differential haemocyte count ; Total plasma protein ; Phagocytic activity ; Bacterial clearance efficiency ; Seaweed ; Aquaculture
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.616-630
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  • 5
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    In:  http://aquaticcommons.org/id/eprint/24040 | 18721 | 2018-08-03 06:36:47 | 24040 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-15
    Description: The development of the commercial culture of penaeid shrimps has been accompanied by the occurrence of infectious and noninfectious diseases. The most important penaeid diseases are caused by organisms that are part of the normal microflora of penaeids. In 1998, the samples were collected from five farms in Ghofase area (Ahadan) 2-5 ponds in each farm. The shrimps of these ponds were preserved in full hygienic conditions, from each pond, at least 5 samples were collected and then transferred to the Aquatic Diseases Laboratory of Khouzestan Fisheries Research Center. The main tissues of Gill, Hemolymph, Hepatopancreas and cuticle of live-shrimps were studied in the laboratory. In this research, a total of 40 fungal species were isolated from different tissues with high abundance in Hepatopancrease (19 species) and Hemolymph (12 species). Aspergillus niger was identified as the most abundant species.
    Keywords: Aquaculture ; Health ; Mycoflora ; Indian white shrimp ; Penaeus indicus ; Ghofase area ; Abadan ; Khouzestan ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-10
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  • 6
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    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25538 | 18721 | 2018-10-05 15:45:55 | 25538 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-16
    Description: This survey carried out from 2012 to 2013 to study of suitable site selection for carp and trout fish species for responsible aquaculture possibility by data collection and literature study. During the survey ecological factors including physical and chemical factors, geological factors including topography and type of soil, biological factors including selection of species and control of invader animals, climatic factors, geographical factors and pollutant including heavy metals, agricultural pesticides Surfactants and crude oils were recognized. Also in comparing with standard levels suitable rate of each important factor in aquaculture were studied.
    Keywords: Aquaculture ; Iran ; Warm Water ; Fish ; Cold Water ; Ecological factors ; Biological factors ; Aquaculture ; Survey ; Carp ; Species
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 33
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  • 7
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    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25553 | 18721 | 2018-10-05 16:16:38 | 25553 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-16
    Description: Nowadays, white spot virus disease is serious threat for breeding and culture industry of shrimp. In this study was increasing resistance of shrimp against white spot virus by using modern methods such as shrimp vaccination with inactivated viruses and recombinant proteins. The aim of this study were determine the growth and survival rates vaccinated and non-vaccinated of Litopenaeus vannamei (5 to 15 and 12 to 26 day), that were challenged with white spot virus in 40 and 60 day rearing. This study consisted two separate groups were vaccinated and non-vaccinated with 11 treatments experimental and each of replicate was stocked 1000 pieces by post larva of 5 to15 and 12 to 26 day. After vaccination, two groups of post larvae exposed to the white spot virus at 40 and 60 day, one groups no exposure to the virus. Samplings were randomly of shrimp in 40, 60 and 80 days 10 pieces each of treatment experimental and measured mean of weight and length. Also, number of deaths was recorded at morning and evening daily and calculated survival rate at the end of study. The results showed growth rate of post larvae vaccinated (5 to15 day) which exposed to white spot virus at 40 and 60 was significantly lower than non-vaccinated of post larval, while the growth rate of post larval exposed to virus in 60 day was significantly increased. On the other hand, growth rate of post larval vaccination (12 to 26 day) exposed to virus in 60 day compared with post larval vaccination (5 to 15 and 12 to 26) exposed to virus in 40 and 60 days was significantly increased. Hence, growth rate was significantly increased in post larval vaccinated (5 to 15 and 12 to 26) which non-exposed to virus. Although the survival rate was post larval vaccinated (12 to 26 days) exposed to virus Post larvae in 60 day higher than post larval were exposed to virus in 40 and 60, but no significant differences were observed. However, relative mortality of post larval vaccination in 12 to 26 day compared with post larval vaccination in 5 to 15 days exposed to virus were significantly lower. Considering growth and survival index was improved of post larval vaccination can be concluded that the optimum age for vaccination against white spot virus of L.vannamei was 12 to 26 day.
    Keywords: Aquaculture ; Iran ; White spot virus ; Litopenaeus vannamei ; Vaccination ; Growth ; Survival rate
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 45
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  • 8
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    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25544 | 18721 | 2018-10-05 15:54:31 | 25544 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-16
    Description: White spot syndrome virus (WSSV) is the causative agent responsible for huge-shrimp viral epidemics in shrimp farms throughout the world.Our study was aimed to determine the effect of WSSV Gamma-vaccinated Litopenaeus vannamei in occurrence of apoptosis. One thousand and twenty PL15 were randomly distributed among 2 treatments and two control groups. Gama-Vaccinated shrimp and none-Gamma-vaccinated ones were our treated and untreated groups. Our result showed there is a significant difference (p〈.05) between vaccinatedexposed group (82.33±2.51) and none-vaccinated exposed group (26.00±10.00) was about 56%. It is concluded that apoptosis can be a helpful process as immune function in shrimp especially against WSSV.
    Keywords: Aquaculture ; Health ; Iran ; Vaccination ; White Spot Disease ; Shrimp ; Litopenaeus vannamei ; WSSV ; Gamma ; Immune
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 30
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  • 9
    Publication Date: 2021-05-19
    Description: With the advent of the science of fisheries and aquaculture in the country, and the importance of reproduction and breeding of various species of aquatic animals (freshwater and salty water), attention has been paid to pathogenic factors in the process of aquaculture, one of these factors is pathogenic microorganisms and Nonpathogenic (bacterial, fungal, and viral) that can increase the environmental risk for aquatic organisms and, in some cases, human beings, and, with accurate knowledge of the disease, steps can be taken to prevent and treat withdrawal, as well as research and More studying on various pathogens in either natural or experimental conditions. Although many studies have been carried out over the years about aquatic microorganisms and aquatic environments, there is no complete information on genetic studies of microorganisms in the country, and if such research is feasible and not required, if Gathering information about these creatures and identifying their genetic reserves can provide the basis for research in various fields. What microorganisms are identified and maintained under standard conditions is a question that has remained unresolved so far and this study has tried to introduce a complete list of microorganisms, including bacteriafunges and viruses that have been isolated so far from aquatic and aqueous humor. And the aquatic microorganisms that have been identified in the microorganism bank are also included, and all the documentation shows that there is a huge potential for the identification and maintenance of these microorganisms. In this study, isolated and identified bacteria from northern waters, internal waters, and south of Iran were 73.39 40 genera and species, respectively. Viruses identified in northern waters, inland waters, and south of Iran were 4 species in aquatic and northern waters of Iran, 6 species in Iranian aquatic and inland waters and 7 species in aquatic and southern waters of Iran. Identification fungi have been reported in the waters of northern, inland and southern waters, respectively, 20,25 of the 12 genera and species. In the bank of the National Center for Genetic and Biotechnological Resources of Iran, there are some species that overlap with bacteria isolated from Iran's water resources. There are 20 species of bacteria, and this is not seen for fungi and viruses.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Database ; Aquatic ; Microorganisms ; Aquaculture
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 48pp.
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