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.

THE NUMBER AND QUALITATIVE CHARACTERISTICS OF FRY FISH IN SHALLOW COASTAL WATERS OF THE VOLGA IN THE SUMMER-AUTUMN PERIOD OF 2012

2017 ◽  
pp. 65-73
Author(s):  
Edward Vladimirovich Nikitin
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Volga River ◽  
Commercial Fish ◽  
Autumn Period ◽  
Fish Juveniles ◽  
Qualitative Characteristics ◽  
Shallow Coastal Waters

Shallow coastal waters of the Volga river is a flooded feeding area for fish juveniles of nonmigratory fish species. There takes place annual downstream migration of fluvial anadromous fish species from spawning grounds of the Volga river to the Northern Caspian Sea. The most important factors determining the number and qualitative characteristics of fry fishes are the level of the Caspian Sea (currently having a tendency to the lowering), hydrological and thermal regimes of the Volga river. Researches were carried out in definite periods of time. In the summer-autumn period of 2012 fry fishes were presented by 19 species (13 of them were commercial species), which belonged to 9 families. The article gives data on all the commercial fish species. In the first decade of July the maximum number of fry fish was registered in the western part of the Volga outfall offshore - in box 247 (19.86 mln specimens/km2), in the eastern part - in box 142 (20.4 mln specimens/km2). The most populous were roach, red-eye, silver bream and bream; size-weight characteristics were better in the areas remoted from the Volga delta. In the third decade of July the quantitative indicators of fry fish on these areas decreased, size-weight characteristics greatly increased. In the second decade of October in the western part of the seaside there were registered increased pre-wintering concentrations of fish juveniles, their qualitative indicators increased, which is evidence to favorable feeding conditions in 2012.

scholarly journals INTERSPECIFIC NUTRITIONAL RELATIONSHIP BETWEEN CLUPEONELLA ENGRAULIFORMIS AND CLUPEONELLA CASPIA IN THE CASPIAN SEA

2019 ◽  
pp. 13-19
Author(s):  
Anna Viktorovna Mikhajlova
Keyword(s):  
Fish Species ◽  
Caspian Sea ◽  
Food Preferences ◽  
Pelagic Fish ◽  
Middle Part ◽  
Aqueous Environment ◽  
The Caspian Sea ◽  
Commercial Fish ◽  
The North ◽  
Close Relationship

Vital activity of the Caspian ichthyofauna is mainly determined by aqueous environment with its multiple factors influencing the hydrobionts’ life cycle. It is well known that in the process of evaluating the stocks of commercial fish species it is necessary to take into account supplying them with food. Trophologic studies of mature species of Clupeonella Caspia and Clupeonella Engrauliformis in the Caspian Sea make a basis for a large number of works; however, the research of food preferences of these fish species is scarce. Clupeonella Caspia inhabits the north, middle and south parts of the Caspian Sea above the 60 m isobath. Clupeonella Engrauliformis is widespread in the middle and southern parts of the Caspian Sea above the depths more than 200 m. In the course of evaluating kilka fattening in the Caspian Sea that was continued in 2011 there were estimated nutrition relations of kilka species over the many years, traced the degree of nutritional similarity and registered interspecific relationship between these pelagic fish. The results obtained have been summarized and the whole range of trophic studies has been shown. The monitoring nature of the studies allows to infer the intensive feeding of Clupeonella Caspia and Clupeonella Engrauliformis in the summer of 2011-2014 and in 2016 in the middle part of the Caspian Sea (the study of pelagic fish fatting was not conducted in 2015). The multi-year comparative analysis of Clupeonella Caspia and Clupeonella Engrauliformis nutrition demonstrated the differences of using the dominant foodstuff among planktonic invertebrates. It has been stated that the index of similarity of the food spectrum does not always have a greater degree of coincidence in close relationship of fish in a systematic respect.

scholarly journals Some commercial fish species nutrition in the Kazakhstan part of the Caspian Sea

2019 ◽  
Vol 81 (4) ◽  
pp. 78-93
Author(s):  
S. M. Shalgimbayeva ◽  
◽  
N. N. Popov ◽  
N. Ibragimova ◽  
Zh. S. Omarova ◽  
...  
Keyword(s):  
Fish Species ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Commercial Fish

INFLUENCE OF INVADER CTENOPHORAN MNEMIOPSIS LEIDYI (A. AGASSIS, 1865) ON THE GENERAL PARTS OF THE CASPIAN SEA ECCOSYSTEM

2018 ◽  
pp. 35-48
Author(s):  
Andrey Mikhailovich Kamakin ◽  
Yuriy Aleksandrovich Paritskiy ◽  
Raisa Pavlovna Khodorevskaya
Keyword(s):  
Fish Species ◽  
Caspian Sea ◽  
Marine Mammals ◽  
Nutrient Budget ◽  
Mnemiopsis Leidyi ◽  
Ecological Problem ◽  
Annual Data ◽  
The Caspian Sea ◽  
Commercial Fish ◽  
Strategy Of Development

The article presents annual data (1999-2016) of ecological surveillance on the influence of newish for the Caspian Sea invader Mnemiopsis leidyi (A. Agassis, 1865) on marine and anadromous fish species. There has been given the analysis of unfavourable effect of invader Mnemiopsis leidyi (A. Agassis, 1865) on the abundance of marine, anadromous, semi-anadromous fishes and Caspian seal. There have been considered mechanisms, sequence and degree of impact of ctenophoran on ichthyophauna and marine mammals via a nutritive base. It has been stated that mnemiopsis distribution corresponds to seasonal distribution of zooplankton and meroplankton, whereas ctenoforan being an organism with aggressive "r-strategy" of development influences ichthyophauna both directly (eating pelagic roe and larvae of sea fish) and indirectly (via nutritive base). Drastic reduction of catches of the Caspian sprat, in particular anchovy sprat and big-eyed sprat, is stipulated by nutritional competence between these fish species and ctenoforan Mnemiopsis leidyi. In turn, decrease in number of the Caspian sprat resulted in change of the nutrient budget of the sturgeon (Russian sturgeon, stellate sturgeon, beluga) and in decrease of their number and commercial stocks. There have been offered the solutions to the ecological problem and measures to restore sturgeon stocks. Results of the research can be used in forecasting commercial fish species stocks in the Caspian Sea and in determining the damage from annual invasions of Mnemiopsis ( Memiopsis leidyi (A. Agassis, 1865)) in the northern part of the Caspian Sea.

scholarly journals OFFERINGS OF HUNNIC-TYPE ARTIFACTS IN STONE ENCLOSURES AT ALTYNKAZGAN, THE EASTERN CASPIAN REGION

2018 ◽  
Vol 46 (2) ◽  
pp. 68-78
Author(s):  
A. E. Astafyev ◽  
E. S. Bogdanov
Keyword(s):  
Caspian Sea ◽  
Historical Records ◽  
Caspian Region ◽  
North Caucasus ◽  
The Caspian Sea ◽  
Land Bridge ◽  
The Third ◽  
Area North ◽  
Sea Area ◽  
Mangyshlak Peninsula

In 2014–2015, nine enclosures built of stone slabs were excavated at Altynkazgan on the Mangyshlak Peninsula, Republic of Kazakhstan. Inside them, remains of offering ceremonies were found: vessels dug into the ground, altars made of limestone blocks, and pits for offerings. In one of these, we found a richly decorated bridle, in another, a belt set of inlaid golden plaques, and in the third, remains of a saddle (silver plates and other items). The entire assemblage has numerous parallels among the 5th and 6th century fi nds from the northern Black Sea area, North Caucasus, and the Volga basin. Ritual burial of a “golden” belt, a bridle, and a ceremonial saddle indicate an advanced cult that included offerings of prestigious belongings of a horseman. These rituals were introduced by Iranian-speaking nomads who had migrated to the eastern Caspian region during the Hunnic raids to Iran in the 5th century. At that time, owing to the regressive phase of the Caspian Sea, the semi-desert northern Caspian coast was connected with Mangyshlak by a land bridge. Our hypotheses are supported by both historical records and modern geomorphological studies of the Caspian Sea.

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.

scholarly journals Length-weight relationship and condition factor of three endemic fish species, Ponticola bathybius, Neogobius caspius and N. pallasi (Perciformes: Gobiidae) from the Southern Caspian Sea basin, Iran

2021 ◽  
Vol 38 (4) ◽  
pp. 523-525
Author(s):  
Nasrin Nikmehr ◽  
Soheil Eagderi ◽  
Hadi Poorbagher ◽  
Keyvan Abbasi
Keyword(s):  
Fish Species ◽  
Caspian Sea ◽  
Condition Factor ◽  
Biological Information ◽  
Biological Research ◽  
The Caspian Sea ◽  
Baseline Information ◽  
Endemic Fish ◽  
First Time ◽  
Southern Caspian Sea

In this study, the length-weight relationships (LWRs) and condition factors were estimated for 445 specimens belonging to three gobiid species viz. Ponticola bathybius (Kessler, 1877), Neogobius caspius (Eichwald, 1831) and Neogobius pallasi (Berg, 1916) from the Southern Caspian Sea basin. Total length and total weight of the examined specimens ranged 4.9-28.3 cm and 0.64-263.4 g, respectively. The length-weight parameter b of the studied species found between 2.47 (N. caspius) and 3.45 (N. pallasi) with r2 ranging 0.831 to 0.988. LWR and K parameters are reported first time for N. pallasi from the Caspian Sea basin. The condition factor estimated was calculated from 0.94 (N. pallasi) to 0.98 (N. caspius) and 1.00 (P. bathybius). The basic biological information on the LWRs of these three gobies will be useful as baseline information for further biological research in the region.

scholarly journals Helminth parasites of fish of the Kazakhstan sector of the Caspian Sea and associated drainage basin

2020 ◽  
Vol 57 (3) ◽  
pp. 241-251
Author(s):  
A. M. Abdybekova ◽  
A. A. Abdibayeva ◽  
N. N. Popov ◽  
A. A. Zhaksylykova ◽  
B. I. Barbol ◽  
...  
Keyword(s):  
Fish Species ◽  
Cyprinus Carpio ◽  
Caspian Sea ◽  
Drainage Basin ◽  
Rutilus Rutilus ◽  
Condition Index ◽  
Infected Fish ◽  
Helminth Parasites ◽  
The Caspian Sea ◽  
Liza Aurata

SummaryThe northern section of the Caspian Sea is an important fishery for Kazakhstan. In the present study, a total of 606 individuals of 13 fish species were collected. For each of Abramis brama, Alosa saposchnikowii, Atherina boyeri caspia, Carassius auratus, Clupeonella cultriventris, Cyprinus carpio, Liza aurata, Leuciscus aspius, Rutilus rutilus caspius, Sander lucioperca, Sander marinus, and Sander volgensis 50 individuals were examined whilst 6 individuals of Siluris glanis were examined. The nematode parasite Anisakis schupakovi was found in all fish species except Liza aurata, Carassius aurata, Cyprinus carpio and Rutilus rutilus at intensities ranging from 1 to 1197 parasites per infected fish. Trematodes of family Diplostomidae were also isolated from all fish except Alosa saposhnikowii, Clupeonella cultriventris and Sander marinus at intensities ranging from 1 to 242 parasites per infected fish. Other parasites found included the nematodes Porrocaecum reticulatum, Contracecum sp, Camallanus sp and Eustrongylus excisus; the cestodes Neogryporhynchus cheilancristrotus, Bothriocephalus opsariichthydis; the monogenean parasites Mazocraes alosa, Ancyrocephalus paradocus, Gyrodactylus spp, Ligophorus vanbenedenii and Dactylogyrus spp; and the crustacean parasites Ergasilus sp. and Synergasilus sp. In addition one unidentified species of nematode and a bivalve of the genus Unio was recovered from Rutilus rutilus caspius. There was no association between Fulton’s condition index and intensity of parasite infection.

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