Tigran Vardanyan

National Academy of Sciences of Armenia | NAS RA · Hydroecology and ichtyology of NAS of RA

The Marmarik River is the largest tributary of the Hrazdan River. However, it is heavily isolated from the main course of the river by the Aghbyurak dam. Considering low density of population and lack of pollution sources in the basin, the Marmarik River valley is a well-known biodiversity area within Armenia. As in many small tributaries, there is...

Freshwaters worldwide are constantly exploited for their water and biological resources. In addition , restoration and management options may exert additional stress on already threatened hydroecosys-tems. In such cases, the necessity of estimating the potential natural feed base that can support growing fish stocks becomes urgent. In this work, we...

The concentrations of some heavy metals (Fe, Zn, Mn, Cu, Mo, Pb, Cd) were measured in river waters, macrozoobenthos, and fish (Kura scrapers) from one of the most developed mining areas in Armenia, the Debed River catchment basin. In order to assess heavy metal contamination and its hydro-ecological and health effects, the macrozoobenthos quantitat...

Endemic fish species of Armenian ichthyofauna – the Sevan trout (Salmo ischchan, Kessler, 1877) is registered in the Red Book of Animals of the Republic of Armenia as critically endangered (corresponds to IUCN category: CR A2cd). Its natural reproduction hardly occurs as a result of numerous problems related to the use and management of water and b...

For full version of manuscript, please visit the link https://rdcu.be/b2eAf Endemic fish species of Armenian ichthyofauna—Sevan trout (Salmo ischchan Kessler, 1877)—is registered in the Red Book of Animals of the Republic of Armenia as “Critically Endangered” (corresponds to IUCN category: CR A2cd). Its natural reproduction hardly occurs as a resul...

At all times Lake Sevan has been famous for its specific fishworld, the core representative of which is Sevan trout. Nowadays only Gegharquni trout and Summer trout have been preserved out of four subspecies of Sevan trout, and they are registered in the “Red Book” of Armenia and IUCN. This study has been conducted by the Institute of Hydroecology...

1 Научный центр зоологии и гидроэкологии НАН РА, 2 ГНПО "НПЦ НАН Беларуси по биоресурсам" В период с июня по октябрь 2011 года были проведены исследования популяций серебряного ка-рася трех модельных водоемов Беларуси-озер Черное, Лисно и Белое-Котлярово, а также в озере Севан в Армении. Сравнительный анализ половой структуры серебряного карася из...

The article studies the morphological characteristics, age, sex structure, fecundity and cytomorphological parameters of erythrocytes of Crucian carp ( Carassius auratus gibelio , Bloch, 1782) from both subwatersheds (Big and Small) of Lake Sevan. The analysis of cyto-morphological characteristics of nuclei and erythrocytes showed that the populati...

Sevan trout is an endemic fish species, registered in the Red Data Book of Armenian Animals as a 'Critically Endangered' species (IUCN category: CR A2cd) and is one of the most valuable fish of the Armenian ichthyofauna. For the purpose of preservation of this endangered fish species, rivers in the South-West part of Lake Sevan have been studied an...

Based on the results of many years of comprehensive research conducted by the Institute of Hydroecology and Ichthyology of the National Center of Zoology and hydroecology of the National Academy of Sciences of the Republic of Armenia, quantitative and qualitative indicators of water in the lake were studied as a necessary condition for the preventi...

Qualitative and quantitative structures of benthic macro-invertebrates, macrophytes, zooplankton, as well as ichthyofauna and fish parasites of the shallow areas of Small Sevan that flooded as a result of an increase in the lake’s water level are analyzed. It is shown that the most appropriate conditions for the development of hydrobionts were foun...

Для мелководных участков Малого Севана, образованных в результате поднятия уровня воды, проанализированы качественный и количественный составы донных макробеспозвоночных, макрофитов и зоопланктона, а также ихтиофауна и паразиты рыб. Показано, что наиболее благоприятные условия для развития гидробионтов сложились на участке, который был затоплен ран...

The study of morphological and ecological parameters of sevan trout was carried out from 2012 to 2014, as well as the comparison of mentioned parameters in different periods of observation was implemented. It was shown that changes in the morpho-ecological parameters of Sevan trout continues today. The causes of such changes are probably the artifi...