The article studies the morphological characteristics, age, sex structure, fecundity and cytomorp... more 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 population of the Crucian carp from the lake is heterogeneous as a whole, and consists of individuals with small (diploid) and large nuclei and erythrocytes (subgroups I and II). In sampling taken from both subwatersheds of Lake Sevan occurrence of individuals with the smallest nuclei (diploid individuals) made 38.8%. Crucian carps with the largest nuclei of red blood cells (subgroup II) are noted among females more than among males, with a low percentage of occurrences - 17.5%. The ratios of the volumes of the nuclei of erythrocytes and the number of nucleoli in the nuclei of erythrocytes of Crucian carps can be indicating the existence of triploid individuals in Lake Sevan. The number of Crucian carps with the largest nuclei of red blood cells (subgroup II, possibly triploids) is 17.5% in both subwatersheds of Lake Sevan. During the spawning period males prevailed to females in Small Sevan (1.5 ♂:1 ♀) and females prevailed to males in Big Sevan (1 ♂:1.6 ♀), which is the result of different spawning conditions in different parts of the lake. The highest role in the catch had individuals at the age of 3+. It has been established that the Crucian carp from Lake Sevan with large nuclei of erythrocytes do not differ statistically from individuals with small nuclei for all studied plastic and meristic characteristics and absolute individual fecundity.
Endemic fish species of Armenian ichthyofauna—Sevan trout (Salmo ischchan Kessler, 1877)—is regis... more 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 result of numerous problems related to the use and management of water and bio-resources in the Lake Sevan drainage basin.Masrik River is formerly known as a spawning river for two ecological races of the Sevan trout, but there is no up-to-date and in-depth studies of its potential to support natural reproduction. Thus, a set of spawning criteria was arranged as matrix and state of Masrik River as spawning area for the Sevan trout was assessed. The results showed that the potential of different parts of Masrik River to support natural reproduction of Sevan trout varied from quite appropriate to inappropriate. The main limiting factors revealed were water temperature, velocity and substrate conditions.
Vestnik of Astrakhan State Technical University. Series: Fishing industry
Endemic fish species of Armenian ichthyofauna – the Sevan trout (Salmo ischchan, Kessler, 1877) i... more 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 bio-resources in the drainage basin of Lake Sevan. The Lichq River is formerly known as a spawning river for two ecological races of Sevan trout, but because of different factors there are no more wild populations of Sevan trout spawning. The aim of the study was checking the efficiency of two methods of egg incubation in the Lichq River for restoration of Gegarkuni population. The experiments were carried out with newly fertilized and eyed eggs of Gegarkuni in the same periods and in the same areas to avoid the unforeseen effects of environmental factors on assessment. The results showed that the mortality rate of green eggs in the natural...
The article studies the morphological characteristics, age, sex structure, fecundity and cytomorp... more 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 population of the Crucian carp from the lake is heterogeneous as a whole, and consists of individuals with small (diploid) and large nuclei and erythrocytes (subgroups I and II). In sampling taken from both subwatersheds of Lake Sevan occurrence of individuals with the smallest nuclei (diploid individuals) made 38.8%. Crucian carps with the largest nuclei of red blood cells (subgroup II) are noted among females more than among males, with a low percentage of occurrences - 17.5%. The ratios of the volumes of the nuclei of erythrocytes and the number of nucleoli in the nuclei of erythrocytes of Crucian carps can be indicating the existence of triploid individuals in Lake Sevan. The number of Crucian carps with the largest nuclei of red blood cells (subgroup II, possibly triploids) is 17.5% in both subwatersheds of Lake Sevan. During the spawning period males prevailed to females in Small Sevan (1.5 ♂:1 ♀) and females prevailed to males in Big Sevan (1 ♂:1.6 ♀), which is the result of different spawning conditions in different parts of the lake. The highest role in the catch had individuals at the age of 3+. It has been established that the Crucian carp from Lake Sevan with large nuclei of erythrocytes do not differ statistically from individuals with small nuclei for all studied plastic and meristic characteristics and absolute individual fecundity.
Endemic fish species of Armenian ichthyofauna—Sevan trout (Salmo ischchan Kessler, 1877)—is regis... more 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 result of numerous problems related to the use and management of water and bio-resources in the Lake Sevan drainage basin.Masrik River is formerly known as a spawning river for two ecological races of the Sevan trout, but there is no up-to-date and in-depth studies of its potential to support natural reproduction. Thus, a set of spawning criteria was arranged as matrix and state of Masrik River as spawning area for the Sevan trout was assessed. The results showed that the potential of different parts of Masrik River to support natural reproduction of Sevan trout varied from quite appropriate to inappropriate. The main limiting factors revealed were water temperature, velocity and substrate conditions.
Vestnik of Astrakhan State Technical University. Series: Fishing industry
Endemic fish species of Armenian ichthyofauna – the Sevan trout (Salmo ischchan, Kessler, 1877) i... more 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 bio-resources in the drainage basin of Lake Sevan. The Lichq River is formerly known as a spawning river for two ecological races of Sevan trout, but because of different factors there are no more wild populations of Sevan trout spawning. The aim of the study was checking the efficiency of two methods of egg incubation in the Lichq River for restoration of Gegarkuni population. The experiments were carried out with newly fertilized and eyed eggs of Gegarkuni in the same periods and in the same areas to avoid the unforeseen effects of environmental factors on assessment. The results showed that the mortality rate of green eggs in the natural...
Uploads
Papers by Nelli Barseghyan
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 bio-resources in the Lake
Sevan drainage basin.Masrik River is formerly known as a spawning river for two ecological races of the Sevan trout, but there is
no up-to-date and in-depth studies of its potential to support natural reproduction. Thus, a set of spawning criteria was arranged as
matrix and state of Masrik River as spawning area for the Sevan trout was assessed. The results showed that the potential of
different parts of Masrik River to support natural reproduction of Sevan trout varied from quite appropriate to inappropriate. The
main limiting factors revealed were water temperature, velocity and substrate conditions.
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 bio-resources in the Lake
Sevan drainage basin.Masrik River is formerly known as a spawning river for two ecological races of the Sevan trout, but there is
no up-to-date and in-depth studies of its potential to support natural reproduction. Thus, a set of spawning criteria was arranged as
matrix and state of Masrik River as spawning area for the Sevan trout was assessed. The results showed that the potential of
different parts of Masrik River to support natural reproduction of Sevan trout varied from quite appropriate to inappropriate. The
main limiting factors revealed were water temperature, velocity and substrate conditions.