Monitoring of Artemia stocks in Urmia lake

ISFJ, 2017

Water reservoirs have an important role in providing water for drinking and agriculture. It is necessary to protect these resources. This study was conducted to determine water quality of Azad Reservoir (Kordestan-Sanandaj) based on Iranian Water Quality Index (IRWQI) and Carlson's Trophic State Index (TSI). Sampling was carried out at five stations during different months in 2015-2016. Results showed that trophic status of Azad dam was mesotrophic based on chlorophyll-a parameters and eutrophic to hypertrophic based on other variables (TP, SDD and DO % at bottom layers). Mean of Carlson's Trophic State Index represented mesotrophic state (high quality) at Azad dam. Based on IRWQI, water quality of dam was classified as excellent quality. Although, mean of indices indicated the suitability of this lake for drinking and agriculture activities but due to declining water quality and increasing trophic level in some months, it is necessary to apply appropriate management strategies for maintaining water quality in the reservoir.

2015

In this research, gut contents of white leg shrimp Litopenaeus vannamei were investigated for 113 days culture period at earthen ponds in Delvar of Bushehr, by sampling every 15 days. Results showed that artificial food had highest weight percentage in gut contents (foregut, midgut, and hindgut) following in order by detritus, zooplankton, phytoplankton, and macrobenthic. In the beginning of culture period, macro-bentic were observed in larval gut contents while other food items were throughout culture period. The maximum occurrence of detritus in gut contents was at 26 and 40 days-old larvae while highest phytoplankton was obtained at 86-days-old larvae in end of culture period. The zooplankton had approximately similar amounts throughout culture period in different parts of gut, while macro-benthic only observed at 26-old-days larvae with maximum amount at foregut and midgut. The mean highest gut fullness attained at foregut (0.95 %) and lowest at hindgut (0.20 %). The dominant color of gut content was green-brown in all parts of gut that could be due to consumption of natural pond products. This study illustrated that most consumed food items in L. vannamei was prepared by natural pond foods. In addition, detritus and plankton have most important in L. vannamei during culture period.

Nova Biologica Reperta, 2018

Feeding frequency and stocking density are important factors affecting growth and maturation of cultured fish. The aims of this investigation were to determine the effects of stocking density (10, 20, 30 and 40 fish per aquarium) and feeding frequency (2, 3 and 4 times on daily) on growth parameters and hematocrit of the Rutilus rutilus caspicus juveniles. The experiment was continued for 45 days in two replicates. The results of this study showed that growth parameters, including weight gain (WG), feed conversion ratio (FCR) and specific growth rate (SGR) were affected significantly by stocking density(P<0.05), but not significantly affected by feeding frequency (P>0.05). The highest WG and SGR were recorded with the lowest stocking density (10 fish / aquarium). The least FCR was obtained in density of 10 fish/aquarium, FCR value was significantly higher with high stocking density (P<0.05). Also, interactions between stocking density and feeding frequency were no significant on growth parameters (P>0.05). Density and feeding frequency had no significant effect of hematocrit concentration (P>0.05). On the other hand, interactions between stocking density and feeding frequency significantly affected hematocrit levels (P<0.05). The lower level of hematocrit was observed in density of 10 fish/aquarium at two times / day feeding frequency. The results of this study indicated that density is significantly affected the growth, but increasing of feeding frequency there is not effect on growth in the Rutilus rutilus caspicus.

Journal of Oceanography, 2012

ISFJ, 2013

Due to study the food regime of Arius dussumieri, a total of 132 specimens were collected from Oman sea waters, Sistine & Baluchistan province. The stomach content, were taken into consideration and it was found that the amount of full, semi-full and empty stomachs were 31, 33 and 36 percent, respectively; of which the highest frequency was in winter (74%) and the lowest was in summer (24%). On the other hand, the fullness index was studied with the highest and lowest value for spring (44%) and winter (5%), respectively. The GaSI shows that A.dussumieri, has better feeding in spring and summer but feeding (up in male) was decreased in autumn and winter. The Food Preference (FP) Index was estimated as: Fishes (39%), Crustacean (40%) and Molluscs (20%) namely all of them are considered as minor food in all four seasons. The most important food items were identification as fishes:

2016

In this study, Dunaliella has been isolated in Jun. 2014 from Hoz-e Soltan and Aran-va-Bidgol salt Lakes (Iran). The isolates have been identified morphologically with the aid of simple light and invert microscope after isolation and purification on their specific medium (Moh202). By using molecular techniques such as polymerase chain reaction (PCR) and amplification of 18S rDNA gene primers, further identification was done and morphological identification were confirmed. The isolation and molecular identification of the Dunaliella species from above-mentioned lakes revealed that, at least two species of Dunaliella, namely, D. parva and D. viridis exist in the studied area.

Journal of Economic Geology, 2019

Introduction The Agh Ziarat (Au±Cu±Mo) Polymetallic deposit is located at 75 north of Urmia, northwestern part of the Sanandaj-Sirjan Zone. Several studies have been carried out on chemical composition, geochemistry, petrology, and petrogenesis of intrusive bodies of the Qushchi area, north of Urmia (Jahangiri, 1993; Behnia, 1996; Asadpour, 2001; Azimi, 2011; Shahabi, 2013; Sarjoughian and Kananian, 2015). However, the mineralization potential of the intrusion rocks and volcano-sedimentary sequences has not been investigated yet. The present investigation provides an overview of the geological framework, mineralogy of orebodies and gangue, geochemical, and geophysical characteristics of the Agh Ziarat deposit. Therefore, identification of mineralization style and potential in the study area can be used as an exploration guide in the regional scale in the Sanandaj-Sirjan zone and elsewhere. Materials and methods Petrography and ore mineralogy studies were carried out on 15 thin, 20 p...

Arsenic is considered as one of the most important environmental contaminant compound. Some plant species can grow in arsenic contaminated soil and they are able to reduce arsenic toxicity. Nowadays, phytoremediation as a new and friendly environmental technique employs the use of plants to remediate contaminated soil. Previous studies showed that Isatis cappadocica is an arsenic hyperaccumulator plant. Accordingly, we conducted this experiment to compare the interaction of arsenic and phosphorus on osmolytes content of I. cappadocica for better understanding the mechanisms applied by this species. Therefore, the plants were grown for 6 weeks in a medium, embedded with combinations of 50, 200, 800 & 1200 μmol l−1 arsenic and 5, 50, 200, 800 & 1600 μmol l−1 phosphorus, respectively. The osmolytes content and the arsenic concentration of harvestable parts were determined. The highest concentration of arsenic was obtained in plants treated with 1200 μmol l−1 As and 5 μmol l−1 phosphoru...

Since Iran is located in a semi arid climate and its agricultural sector, as the largest water consumer, facing sever water scarcity, conservation of existing water resources is inevitable. In other hand, growing population necessitates more food production. Reasonable determination of criteria such as virtual water and water productivity of agricultural products can improve water saving and assist scheduling to produce more food. The objective of this study was to quantify the water productivity and virtual water for selected cropping pattern system in Takestan irrigation and drainage network. In order to determine the net irrigation volume of water and crop evapotranspiration, NETWAT software package was used. The water productivity, virtual water and the energy produced by virtual water were then calculated. The results indicated that growing green virtual water can increase water productivity. Considering the reduction of virtual water amount in crops with more energy such as wheat, barley and potato, cropping pattern can also be established based on crops energy production.

DOAJ (DOAJ: Directory of Open Access Journals), 2019

Occurrence of heavy floods in rivers causes a lot of damages and losses. In this research, to highlight the river-training reaches in 10.9 km of Babolrud River, first, using topographic map of the area, the Tin layer was created in GIS software. Then, using the HEC-GeoRAS extension, the main route and cross sections of the river were prepared and introduced to the HEC-RAS model. River discharge with return periods of 2 to 200 years was calculated. Flow analysis in the agricultural and urban areas was performed and the areas which need training measures such as flood-retaining walls and levees were specified and designed. The structural design, stability control and sliding was performed based on the Standard No. 518, using RetainWall software, and design and control of levee stability was performed based on the Standard No. 214, using GeoStudio software. The cost of project implementation was estimated based on the Price List of 2017. The output of HEC-RAS software showed that height of flood-retaining wall in 3 urban reaches ranged between 1.73 to 2.8 m and in 5 agricultural reaches ranged between 1.46 to 2.25 m. It was concluded that the overall cost of levee implementation is about 9.01 billion Rials, of gravity concrete flood-retaining wall is about 9.26 billion Rials and of concrete cantilever inverted T shape flood-retaining wall is about 10.05 billion Rials. Thus, using floodretaining levee is the most economical option.