scholarly journals ASSESSMENT OF INFLUENCE OF THE AUTOACCLIMATIZERS ON AUTOCHTHONOUS BIVALVE MOLLUSKS

2020 ◽  
pp. 6-11
Author(s):  
Marina Vladimirovna KHLOPKOVA ◽  
Ruslan Magomedovich BARKHALOV ◽  
Kais Magomedovich GUSEYNOV ◽  
Aysha Sharapatinovna GASANOVA
Keyword(s):  
Caspian Sea ◽  
Main Role ◽  
Bivalve Mollusks ◽  
The Caspian Sea ◽  
Anthropogenic Transformation ◽  
European Part Of Russia ◽  
Russian Sector ◽  
Mytilaster Lineatus ◽  
A New Species ◽  
Benthivorous Fishes

Anthropogenic transformation of the Caspian Sea biocenoses results in the loss of their uniqueness and decrease of their biodiversity. In recent years the main role in the formation of biomass has played the autoacclimatizant mollusks Abra ovata , Mytilaster lineatus and Cerastoderma glaucum which dominate the biocenoses of the Caspian sea and are the main food components of valuable commercial benthivorous fishes. In 2018 live specimens of Corbicula fluminalis (O. F. Muller, 1774), a new species of bivalve mollusks for the Russian sector of the Caspian sea and the entire European part of Russia, were first discovered on the Daghestan coast.

Verbascum shahsavarensis (Scrophulariaceae), a new species for Flora of Iran

Phytotaxa ◽  
2015 ◽  
Vol 203 (1) ◽  
pp. 76 ◽  
Author(s):  
Arash SOTOODEH ◽  
Laure Civeyrel ◽  
Farideh Attar
Keyword(s):  
New Species ◽  
Endemic Species ◽  
Caspian Sea ◽  
The Other ◽  
Distribution Map ◽  
Flora Of Iran ◽  
The Caspian Sea ◽  
Coastal City ◽  
North Of Iran ◽  
A New Species

A new endemic species, Verbascum shahsavarensis, is described from north of Iran. Based on two unique characters of this species, these being two anterior longitudinally obliquely inserted anthers and an ebracteolate pedicel, we compared it to species described by Murbeck in 1933. The new species can be easily distinguished from the other Iranian species by having bi-colored hairs on the stamen filaments and the unique anther and pedicel characters. A distribution map is provided. The name of new species comes from Shahsavar, the ancient name of Tonekabon, an old coastal city on the Caspian Sea.

scholarly journals TO THE FAUNA OF BIVALVE MOLLUSCS OF THE DAGESTAN COAST OF THE CASPIAN SEA

2018 ◽  
Vol 13 (2) ◽  
pp. 9-21 ◽  
Author(s):  
Marina V. Khlopkova ◽  
Magomedzagid K. Guseynov ◽  
Kais M. Guseynov ◽  
Aysha Sh. Gasanova
Keyword(s):  
Fish Species ◽  
Caspian Sea ◽  
Food Resource ◽  
Fish Fauna ◽  
Bivalve Mollusks ◽  
The Caspian Sea ◽  
Commercial Fish ◽  
Main Food ◽  
The Third ◽  
The Individual

Aim. The aim is to study bivalve mollusks of the Dagestan zone of the Caspian Sea as the main feed for all the fish fauna in modern conditions. Material and methods. For the study, are used the materials received in the period of spring-autumn 2015-2017. The collection of material and data processing was carried out according to traditional methods. For the study of nutrition, 30 specimens of each fish species were opened. Such feeding characteristics as the composition of food and the ratio of feed components are given. In the study of shells of bivalve mollusks, the following morphological parameters were measured: length (L), height (H), convexity (Con.), in accordance with the most common measurement technique. Were calculated the allometric coefficients for each year of the life of the individual: the coefficient of elongation (the ratio of height to length), the convexity coefficient (the ratio of convexity to the height). Results. At all periods of the level regime, mollusks are the main food resource of the Caspian Sea. At present they form the basis of the food bolus of the investigated commercial fish species. In June 2017, 25 km north of the city of Makhachkala, after a storm, we found 109 shells of Corbicula fluminalis (O.F. Müller, 1774) (a new invasive atypical species for the investigated aquatorium), the third part of which still had the remains of the ligament. The species was the third most abundant and represented by specimens of all age stages. Conclusions. At present, there are fluctuations in the biomass of the autocolonizers Cerastoderma lamarcki (Reeve), Mytilaster lineatus (Gmelin) and Abra ovata (Philippi), as well as a significant reduction in the range of autochthonous Caspian species, mainly Didacna Eichw. Bivalve mollusks are the main food resource of the Caspian Sea. In conditions of increasing anthropogenic load, further detailed studies of the Caspian's malacofauna are needed.

scholarly journals A new species of the genus Capoeta Valenciennes, 1842 from the Caspian Sea basin in Iran (Teleostei, Cyprinidae)

ZooKeys ◽  
2017 ◽  
Vol 682 ◽  
pp. 137-155 ◽  
Author(s):  
Arash Jouladeh Roudbar ◽  
Soheil Eagderi ◽  
Hamid Reza Ghanavi ◽  
Ignacio Doadrio
Keyword(s):  
New Species ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
A New Species

A New Species of Amphipod of the Genus Niphargoides From the Caspian Sea

Crustaceana ◽  
1968 ◽  
Vol 15 (1) ◽  
pp. 98-100 ◽  
Author(s):  
A.N. Derzhavin ◽  
G.M. Pjatakova
Keyword(s):  
New Species ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
A New Species

scholarly journals Biology and current state of anchovy kilka (Clupeonella engrauliformis Borodin)

2020 ◽  
Vol 2020 (2) ◽  
pp. 45-51
Author(s):  
Vjacheslav Petrovich Razinkov ◽  
Yuriy Aleksandrovich Paritskiy ◽  
Yulia Nikolaevna Grozesku
Keyword(s):  
Survival Rate ◽  
Caspian Sea ◽  
Small Fish ◽  
Way Of Life ◽  
The Caspian Sea ◽  
Dynamics Of Abundance ◽  
Current State ◽  
Beroe Ovata ◽  
The Relationship ◽  
A New Species

In the Caspian Sea sprats is the name of the numerous small fish of herring family (Clupeonella). One of Clupeonella representatives is anchovy sprat. It differs from other types of kilka not only in appearance, but also in its way of life. A brief biology of the species and the state of ecosystem of the Caspian pelagic zone has been described. Anchovy kilka has been a leading targeted fish for over 50 years. Invading the Caspian Sea by ctenophore-mnemiopsis has undermined the stocks of anchovy sprats and caused the crisis of anchovy kilka fishing. Recently, there has been observed a slight increase in the number of the species. The survey materials confirm the increase in the number of juveniles in the studied catches. There are presented the materials from the last six years (2014–2019) of observations (eight research runs), shown the dynamics of abundance, biomass, spawning females, and total fertility of the population. Spawning efficiency and survival rate in early ontogenesis are analyzed. The relationship between kilka survival rate and the number of emerging generations is stated. Recommendations on restoring the stock of anchovy kilka are given. To restore the ecosystem of the Caspian Sea there has been proposed the invasion of a new species – ctenophore-beroe (Beroe ovata), which, due to the structure of its mouthparts eats only jelly-skinned (ctenophore-mnemiopsis, exceptionally) and can significantly reduce the number of ctenophore-mnemiopsis

scholarly journals Species Composition of the Benthic Macroinvertebrates on the Coastline Vegetated Rocky Substrates of the Southern Caspian Sea

2015 ◽  
Vol 16 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Amir Faraz Ghasemi
Keyword(s):  
Caspian Sea ◽  
Benthic Fauna ◽  
The Caspian Sea ◽  
Additional Food ◽  
Fish Stocks ◽  
Balanus Improvisus ◽  
Palaemon Elegans ◽  
Potential Interactions ◽  
Mytilaster Lineatus ◽  
Southern Caspian Sea

Abstract For studying benthic macrofaunal composition associated with seagrass rocky beds of the southern Caspian Sea, two time samplings were carried out along the coast line in the winter and summer of 2013. In total, 1,286 specimens of the five species were identified: Pontogammarus maeoticus, Balanus improvisus, Mytilaster lineatus, Palaemon elegans and Alitta succinea. The total recorded abundance was 5,675 and 755 ind./m2, with a biomass of 147,271 and 31,238 mg/m2 in the winter and summer respectively. The collected species in this study are generally non-indigenous (except P. maeoticus) and could potentially have an effect on native benthic fauna, as an additional food source could facilitate the commercially exploited fish stocks. Thus further studies are required to monitor their potential interactions on the Caspian Sea fauna

scholarly journals THE CURRENT STATE OF THE KEFAL FAMILY (MUGILIDAE) IN THE COASTAL ZONE OF THE DAGHESTAN COAST OF THE CASPIAN SEA

2020 ◽  
pp. 12-15
Author(s):  
Evgeny Nikolaevich LOBACHEV ◽  
Nukhkadi Ibragimovich RABAZANOV ◽  
Ruslan Magomedovich BARKHALOV ◽  
Umshanat Dzhamaldinovna ZURKHAEVA ◽  
Diana Pavlovna KLUSOVA
Keyword(s):  
Coastal Zone ◽  
Marine Fish ◽  
Caspian Sea ◽  
Environmental Changes ◽  
Anthropogenic Factors ◽  
Main Role ◽  
The Caspian Sea ◽  
Freshwater Bodies ◽  
Fish Catch ◽  
Quantitative Changes

For more than a century of active commercial exploitation and environmental changes in the Caspian Sea, the structure of the population of marine fish species has undergone significant qualitative and quantitative changes. In this group of fish until 1960, the main role in the fishery was played by sea herring, which provided up to 50–70% of the total fish catch in the region. Interest in the study of marine fish of the Caspian Sea, using the example of mullets, Black Sea acclimatizers, is due to the fact that under new conditions, as well as a result of deep negative changes in the ecology of this reservoir under the influence of natural and anthropogenic factors, especially recently. At present, among marine fish, one of the main and promising fishing objects is mullet, which, since the period of acclimatization, has formed a high abundance in the coastal zone of the Daghestan coast of the Caspian Sea. Mullet are euryhaline fish that can live both in sea, salty water, and freshwater bodies. In this regard, the objects of this study were mullet (singil), the study of their commercial catches and stocks in the Caspian Sea.

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