نتایج جستجو برای: پوزانوکalosa caspia
تعداد نتایج: 162 فیلتر نتایج به سال:
در این پژوهش میزان فعالیت آنتی اکسیدانی روغن هسته ی انار بر روغن ماهی کیلکای معمولی (clupeonella cultriventris caspia) بررسی شد. برای طراحی تیمارها از نرم افزارversion 6 ® design-expertو مدل d-optimal mixture design استفاده شد. اثر روغن هسته ی انار در غلظت های 0/0، 07/0، 15/0، 22/0و 3/0 درصد در به تأخیر انداختن فرآیند اکسایش در روغن ماهی خام تعیین شد. با اندازه گیری شاخص های پر اکسید، تیوباربیت...
in the present study common kilka from guilan province coastal area (port of anzali) and fish meal produced from it, have been examined to investigate the type and amount of polyaromatic hydrocarbons (pahs). bio monitoring is very important because these pollutants are carcinogenic and mutagenic compounds, if they enter human food chain. sampling process was completed in anzali fishing port. fo...
در این تحقیق عوامل بیوشیمیایی موثر در فعالیت آنزیم تریپسین روده و ضمائم پیلوریک که در پدیده هضم دیواره شکمی (belly bursting) در ماهی کیلکای معمولی (clupeonella cultriventris caspia) نقش دارد، مورد مطالعه قرار گرفتند. بررسی عوامل دما، ph، عناصر فلزی و بازدارنده ها نشان داد که آنزیم تریپسین در دامنه دمایی بین 70- 4 درجه سانتیگراد، بیشترین فعالیت را در دمای 60 درجه سانتیگراد داشت و توانست پایداری ...
the present research aimed to study the growth and reproductive parameters of common kilka clupeonella caspia in southern caspian sea in 2010. after measuring the length and weight of 3774 samples, they were dissected, sex determined and female gonads were weighed. sexual maturity classification was carried out based on six stages. age was determined using sagitta otoliths. length-weight relati...
This study was carried out to investigate population dynamic of Caspian sand smelt (A. caspia) based on a monthly sampling in northern coast of Gorgan bay, between the estuary and canal of Khozeini, during its migration to coastal areas from March to September 2017. A total of 800 samples were collected using beach siene. Length frequency analysis revealed that there is significant difference b...
The predatory cladoceran Cercopagis pengoi has extended its range over the past decade from the Ponto-Caspian basin into the Baltic Sea and the Laurentian Great Lakes. This study employs mitochondrial DNA (mtDNA) sequence analysis to elucidate the invasion corridors exploited during this range expansion. The Caspian and Black Sea populations of C. pengoi exhibit marked genetic divergence, enabl...
Title of Document: EPIFAUNAL DISTURBANCE BY PERIODIC LOW DISSOLVED OXYGEN: NATIVE VERSUS INVASIVE SPECIES RESPONSE Elizabeth Bromley Jewett, Doctor of Philosophy, 2005 Directed By: Professor Kenneth Sebens, Department of Biology Dr. Anson Hines, Smithsonian Environmental Research Center Invasive species and low dissolved oxygen (DO) threaten the biodiversity and ecosystem health of estuaries wo...
Beach seine is fishing gears that occupy all depths of water from surface to bed by non-gillnet net. Increasing non-standard catches caused this survive was done to standardization of the beach seine mesh size. The research was started from winter of 2017 to spring of 2017, performing 73 hauling with four mesh sizes of 26, 28, 30 and 33 mm (knot to knot) in the bag area of the beach seine in ...
There have been recent changes in the Caspian Sea ecosystem, such as those due to changes in sea level or those caused by the invasive ctenophore, Mnemiopsis leidyi. It is believed that these changes had significant impacts on the absolute and relative abundance of the commercially important anchovy kilka (Clupeonella engrauliformis) and common kilka (C. cultriventris caspia) leading to decline...
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