نتایج جستجو برای: caspian sea

تعداد نتایج: 131508  

Journal: : 2021

Prediction of Coastal Wave Height using Hybrid-Wavelet Methods Artificial Intelligence (Case study: Amirabad Port the Caspian Sea)

This study aimed to assess ecological quality status of hard substratum macroinvertebrates communities of the Caspian Sea with three ecological indices and their relation with environmental factors. For this purpose benthic communities of the Caspian Sea basin were studied seasonally during 2014 in 8 sampling sites. Temperature, salinity, dissolved oxygen, pH, nitrate, nitrite, silicate and pho...

The black-striped pipefish, Syngnathus abaster, is a species of the Syngnathidae family. This study provides data on the morphometric, meristic and genetic structuring of the Caspian Sea pipefish, Syngnathus abaster. Eight morphometric characteristics based on total length and five morphometric characteristics based on standard length were analyzed. A total of 50 specimens were collected in bra...

Journal: :تحقیقات جغرافیایی 0
جواد خوشحال دانشگاه اصفهان جواد خوشحال دانشگاه اصفهان عبدالعظیم قانقرمه دانشگاه اصفهان

â â â  aside from its annual and seasonal fluctuation, caspian sea level has sudden change with hourly and daily continuity caused by atmosphere circulation patterns. sometimes these fluctuations are so intense that they make irreparable damage to the economical and social activities in the coastal sea areas. the aim of this study is synoptic recognition of factors causing storm levels in the s...

Journal: :caspian journal of environmental sciences 2014
al et z. ramzanpour

persian sturgeon, acipenser persicus is a native, commercially important and highly steemed fish species in the caspian sea. in this study, effects of nodularin (nodln), a cyclic pentapeptide hepatotoxin, on liver and gill tissues of a. persicus were studied. nodularin was produced in high amounts by nodularia spumigena, a cyanobacterium species during the algal bloom in the caspian sea and was...

Journal: :international journal of environmental research 0

large amounts of degradable wastes including sewage water and agricultural waste or nutrients that stimulate growth of organic matter are discharged into the caspian sea. as a result, average dissolved oxygen concentration in deeper layers is decreasing. this paper presents distribution and seasonal variations of the concentration of dissolved oxygen over the southern shelf of the caspian sea a...

Journal: :علمی شیلات ایران 0
فاطمه کازرونی منفرد f kazerooni monfared فروزان باقرزاده f bagherzadeh محمد رضا نوروز فشخامی m.r nowruzfashkhami محمد پورکاظمی m pourkazemi

the chromosome number and type as well as karyotype in vimba vimba persa were studied. a total of 200 larvae and 10 fingerlings of this species with an average weight of 30.2g obtained from shahid ansari fish hatchery. to arrest mitosis in metaphase, larvae under study were placed in a 0.05% solution of colchicine for a period of 6h while the fingerlings were given an intramuscular injection of...

Journal: :علوم و تکنولوژی محیط زیست 0

in this study, the diversity and distribution of economical bony fishes in less-than-ten-meter depths, cpue and population features such as total length, weight and age were investigated in the southern part of the caspian sea in 1385-6. sampling was done in five regions: amir abad, larim, izdeh, kheyroud, and nashtarood with gilnet in mesh sizes of 26, 33, 40, 60, 100, and 150 mm. in total, 22...

Journal: :caspian journal of enviromental sciences 0

following the collapse of the soviet :union: and the discovery of gas and oil in central asia and caucasia, it faced complex interests in the international political economy. these problems were mainly rooted in developing plans of the countries for increasing their influence in the area and also in russia's connections with the iranian and turkish governments in the region. this paper inv...

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