Recursos de colección

Aquatic Commons (36.735 recursos)

The Aquatic Commons is a thematic digital repository covering the natural marine, estuarine /brackish and fresh water environments . It includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects.

Type = Thesis

Mostrando recursos 1 - 20 de 308

  1. Effect of temperature on genomic and some biological indices during embryonic and larval development of Caspian trout Salmo trutta caspius Kessler, 1877

    Alizadeh Sabet, Hamid Reza
    Since 1966 especially recent decade, Caspian trout (Salmo trutta caspius Kessler, 1877) considered as a strategic endemic species for Caspian Sea fisheries resources also coldwater aquaculture in Iran. Nowadays habitat condition effects on this subspecies during life stages, artificial breeding and incubation period noticed by research and execution sessions of fisheries in Iran. Incubation duration of Caspian trout from artificial fertilization followed by green egg and eyed egg, hatching and yolk sac absorption identified as most sensitive stages for fish and any pollution, stress and deviation by natural life conditions of embryo up to larvae could provide possible mortalities and...

  2. Development and evaluation of the polymerase chain reaction (PCR) method for diagnosis of spring viremia of carp virus (SVCV)

    Seyed Mortezaei, Seyed Reza
    Aquaculture has been expanded rapidly to become a major commercial and food-producing sector worldwide in recent decade. In parallel, viral diseases rapidly spread among farms causing enormous economic losses. The accurate detection of pathogens at early stages of infection is a key point for disease control in aquaculture. Spring Viraemia of Carp Virus (SVCV) is a very severe pathogen of carp fishes in different parts of the world and is categorized as a reportable listed disease in the annual published list of World Organization for animal Health (OIE). The objective of this study was to develop and evaluate RT- PCR...

  3. Protection of white leg shrimp (Litopenaeus vannamei) against white spot disease virus using oral recombinant bioencapsulated VP28

    Houshmand, Hossein
    Aquaculture, is perceived as having the greatest potential to meet the growing demand for aquatic food. Crustaceans form one of the main value added components in aquaculture and among them, shrimp aquaculture is the predominant one. Industrial shrimp fanning, in combination with poor management in shrimp aquaculture, has quickly led to severe pollution in shrimp ponds, thereby creating a suitable environment for development of bacterial and virus diseases. White spot disease is one of the most deadly diseases that are caused heavy loss in all Penaeid shrimps family. In Iran during 2002 to 2004 in the Kuzestan province and in...

  4. Investigation on possibility of survival and growth enhancing by selected seaweeds from Persian Gulf in post larvae shrimp Litopenaeus vannamei

    Dashtiannasab, Aghil
    The use of antibiotics in aquaculture has been limited. Scientifics seeking for natural substitutes to prevent of aquatic animals diseases. Considering seaweeds are rich of nutritions and bioactive compounds, the purpose of this study is: investigation the potential and use possibility of native seaweeds from Persian Gulf in shrimp aquculture industry to improve growth, survival of postlarvae and to resistance against pathogens such as vibriosis. For this propose 7 macroalgae species from Bushehr province coast, inclouding: green algae (C. iyengarii), brown algae (S. angutifolium and S. ilicifolium) and red algae (L. snyderiae, K. alvarezii and G. corticata) were collected and...

  5. Role of Aeromonas hydrophila in bacterial septicemia of cultured carps in Khouzestan Province and investigation on protectivity of bacterin (s) prepared from acute isolate(s) of it

    Ahangarzadeh, Mina
    Motile Aeromonas are the most common bacteria of freshwater in the world that cause disease in fish and other cold-blooded and warm-blooded hosts. Among this group of bacteria, Aeromonas hydrophila is important in causing complications such as fin rot, skin ulcers and lethal hemorrhagic septicemia in fish. Several virulence factors involved in the pathogenesis of Aeromonas hydrophila, including extracellular enzymes (protease, lipase, elastase, gelatinase and nuclease) and toxins. From the exotoxins, hemolysin, aerolysin and cytolytic enterotoxin play an important role in pathogenesis. Detection of virulence markers by PCR as a key component of determining the pathogenesis of the bacteria and...

  6. Study of rainbow trout neoplasia in the region of Haraz

    Notash, Shahab
    This study was carried out in order to determine neoplasia presence in rainbow trout in Haraz area. Neoplasia in various species of fishes including freshwater, brackish water and marine fishes was reported in other countries. But up to now there is no documented report of rainbow trout neoplasia in Iran. The study was performed in 20 farms of Haraz area during 2004-2005. All fishes of each farm firstly were observed in order to any abnormal mass which is suspicious to neoplasia. Besides in order to observation of external and internal organs, 20 fishes was sampled randomly from each farm and...

  7. Study of nephrocalcinosis in rainbow trout (Oncorhynchus mykiss), from fry to brood stock

    Mortazavi Tabrizi, Javid
    For survey incidence of nephrocalcinosis in rainbow trout fish, during winter 1385, samplings were performed in three fish farm with different water source: river, spring and recirculation system by using well water. In this survey 5 specimens from each 8 groups and in general 120 specimens of this fish were caught by random sampling, and also amounts of O2, CO2, pH and temperature of water were measured. Then blooding and renal tissue sampling performed that renal samples were fixed in 10% buffered formalin and blood samples after separating serum stored in -200C. Renal specimens transferred to pathology laboratory, pathological slides...

  8. Field study and numerical simulation of developing red tide in the northern Strait of Hormuz

    Hamzehei, Samad
    The catastrophic event of red tide has happened in the Strait of Hormuz, the Persian Gulf and Gulf of Oman from late summer 2008 to spring 2009. With its devastating effects, the phenomenon shocked all the countries located in the margin of the Persian Gulf and the Gulf of Oman and caused considerable losses to fishery industries, tourism, and tourist and trade economy of the region. In the maritime cruise carried out by the Persian Gulf and Gulf of Oman Ecological Research Institute, field data, including temperature, salinity, chlorophyll-a, dissolved oxygen and algal density were obtained for this research. Satellite...

  9. Biological activities (antibacterial, antifungal and cytotoxic) of secondary metabolites of Ircinia spp.

    Nazemi, Melika
    Sponges are the most primitive of the multicellular, These organisms don’t have any mechanical defense system, so their early appearance in evolution has given them a lot of time for the development of advanced secondary metabolites as chemical defense system. Sponges have the potential to provide drugs from chemical components against diseases. In this investigation the sponge samples, which it is Ircina spp., were collected at depth of 15- 24 meter, from locations on the coastline of Island Kish in Persian Gulf of Iran. For identifying natural components, methanolic and diethyletter were used as extraction solvents, after removal of the...

  10. Three dimensional models of water flow in the Persian Gulf

    Raeissadat, Mohammad Reza
    Persian Gulf region is globally of great importance due to its economical and political reasons. The importance lies in oil sources and sea exports. Geophysical phenomena dominated in the water circulation affected this region is called Monsoon it stretches from African coasts to the half way of Red Seal affected all coasts of Persian Gulf and goes toward east to the Indian ocean. Other essential factors in the water circulation in this region are net evaporation (several meters in per year), high density and high salinity. In this article the effects of wind stress and evaporation in the water circulation...

  11. Refolding of omega conotoxin peptide derived from marine snail, Conus magus, to evaluate its analgesic effects

    Eisapoor, Seyed Sahand
    Oxidative refolding is one of the key challenges hampering the development of peptide based compounds as therapeutics. The correct refolding for three disulfide peptide like w-Conotoxi n MVIIA is difficult and crucial for biological activity. This work advanced knowledge of chemical and biological for improve oxidative refolding of synthetic w-Conotoxi n MVIIA in base of Conus magus venom. The present study aimed to set up an appropriate and effective protocols for refolding of disulfide-rich w-Conotoxin MVIIA. In this study, the crude peptide was protected with Acm group, according to the right amino acid sequences (Synthesized by Australian Company). The crude...

  12. Numerical study of circulation in the Caspian Sea and its effects on the southern coastal currents

    Shiea Ali, M.
    In this study, numerical simulation of the Caspian Sea circulation was performed using COHERENS three-dimensional numerical model and field data. The COHERENS three-dimensional model and FVCOM were performed under the effect of the wind driven force, and then the simulation results obtained were compared. Simulation modeling was performed at the Caspian Sea. Its horizontal grid size is approximately equal to 5 Km and 30 sigma levels were considered. The numerical simulation results indicate that the winds' driven-forces and temperature gradient are the most important driving force factors of the Caspian circulation pattern. One of the effects of wind-driven currents was...

  13. Physical modeling of processes of sediment transport in inlets

    Sadat-Kiaee, M.
    During the transformation of the low tide to the high tide, an exactly inverse phenomenon is occurred and the high tidal delta is formed at the mouth upstream. Increasing the tidal range does not affect the nature of this phenomenon and just change its intensity. In this situation, the inlet will be balance over time. A new relationship between equilibrium cross section and tidal prism for different tidal levels as well as sediment grading has been provided which its results are corresponded with results of numerical modeling. In the combination state, the wave height significantly affects the current and sedimentary...

  14. The experimentally pathogenesis of Aeromonas hydrophila in Astacus leptodactylus with emphasis on temperature in bacterial pathogenesis

    Cookiyae, Arash Sam
    In this study, four hundred freshwater Crayfish (A. leptodactylus) with average weight of 25-40g were purchased from Aras dam reservoirs in west Azerbayjan province and transported to Iranian Artemia Research Center of Uromya province in September 2010. (One hundred crayfish extra purchased for probably mortality). Before implement of experiment the Crayfish were acclimated for ten days. These experiments was designed in four group treatments (Number, 1,2,3,4) and one control group (Number 5) in triplicate with 20 Crayfish in each repetition prepared of glass aquarium with size (50x40x30cm). Many of infected Crayfish were used for isolation of bacteria. Haemolymph sample had...

  15. Three dimensional circulation of water with variable wind in the Caspian Sea

    Nasimi, Sorena
    This research is based on a numerical model for forecasting the three-dimensional behavior of (sea) water motion due to the effect of a variable wind velocity. The results obtained are then analyzed and compared with observation. This model is based on the equations that overcome the current and distribution of temperature by applying the method of finite difference with assuming Δx, Δy as constant and Δz, variable. The model is based on the momentum equation, continuity equation and thermodynamic energy equation and tension at the surface and middle layers and bottom stress. The horizontal and vertical eddy viscosity and thermal...

  16. Investigations on growth ecology and reproduction of Sargassum sp. and Gracilaria on intertidal region in Bandar Lenge

    Rafiee, Farnaz
    Investigations on growth and quantity of phycocolloids of Sargassum sp. and Gracilaria corticata was done on field and laboratorial works over one year from January 2003 to May 2004. Sargassum thalli began growth from January. The highest biomass value recorded 1611.04 gm^-2 was obtained in November. The receptacles appeared on November and released eggs. The senescence of Sargassum thalli was in December and the new thallus began to grow from January, The highest relative growth rate (6.74 percent) was in February. The relative growth rate showed significant correlation (p<0,05) with temperature. The highest value of alginate was in November (10.02...

  17. Study of salinity gradients in the Persian Gulf and an experimental model for electric energy extraction from them using nano-membranes

    Sabetand Jahromi, Abdolreza
    Salinity gradient power (SGP) is the energy that can be obtained from the mixing entropy of two solutions with a different salt concentration. River estuary, as a place for mixing salt water and fresh water, has a huge potential of this renewable energy. In this study, this potential in the estuaries of rivers leading to the Persian Gulf and the factors affecting it are analysis and assessment. Since most of the full water rivers are in the Asia, this continent with the potential power of 338GW is a second major source of energy from the salinity gradient power in the...

  18. The study of the sedimentation mechanism in channels under the impact of tidal currents

    Azadbakht, Z.
    The purpose of this research is to study sedimentation mechanism by mathematical modeling in access channels which are affected by tidal currents. The most important factor for recognizing sedimentation process in every water environment is the flow pattern of that environment. It is noteworthy that the flow pattern is affected by the geometry and the shape of the environment as well as the type of existing affects in area. The area under the study in this thesis is located in Bushehr Gulf and the access channels (inner and outer). The study utilizes the hydrodynamic modeling with unstructured triangular and non-overlapping...

  19. A review on systematic and taxonomic of the Persian Gulf fish species, based on geographical distribution pattern and habitat diversity, using by GIS

    Owfi, Fereidoon
    During the period from 2011 - 2015 with the aim of this study was to systematically review and in particular the revised classification of the Persian Gulf (and the Strait of Hormuz) and to obtain new information about the final confirmed list of fish species of Iranian waters of the Persian Gulf (and Hormuz Strait), samples of museums, surveys and sampling, and comparative study of all available sources and documentation was done. Classification systematic of sharks and batoids and bony fishes. Based on the results, the final list of approved fish of the Persian Gulf (including the Strait of Hormuz...

  20. Seasonal variation of acetylcholinesterase, catalase, glutathione s transferase in different size of Pinctada radiata and metal pollution (Pb, Cd, Ni) in Persian Gulf

    Ali Asgari, Elahe
    There are various tools for monitoring the concentration of pollutants on aquatic ecosystems. Today these studies are based on biological monitoring and biomarkers. The aim of this study was to measure the concentration of the acetylcholinesterase (AChE), glutathione S-transferase and catalase as biomarkers of heavy metal contamination in pearl oyster Pinctada radiata and their mechanism in aquatic ecosystems. Heavy metals lead, cadmium and nickel were measured in soft tissue and studied stations in four seasons. Samples were collected seasonally in Lavan stations, Hendurabi and Nakhilo (in the northern Persian Gulf) from spring 2013 to winter of that year by scuba...

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