Contamination Levels and Specific Accumulation of Persistent Organochlorines in Caspian Seal ( Phoca caspica ) from the Caspian Sea, Russia

1999 ◽  
Vol 37 (3) ◽  
pp. 396-407 ◽  
Author(s):  
M. Watanabe ◽  
S. Tanabe ◽  
R. Tatsukawa ◽  
M. Amano ◽  
N. Miyazaki ◽  
...  
Keyword(s):  
Caspian Sea ◽  
The Caspian Sea ◽  
Specific Accumulation ◽  
Contamination Levels ◽  
Caspian Seal

scholarly journals Evaluation of rate of pathological changes in parenchymal organs for embryo of caspian seal Phoca caspica in modern conditions of the ecosystem in the Caspian Sea

2014 ◽  
Vol 178 (3) ◽  
pp. 191-198
Author(s):  
Victoria V. Volodina ◽  
Maria P. Grushko ◽  
Nadezhda N. Fedorova
Keyword(s):  
Caspian Sea ◽  
Pathological Changes ◽  
The Caspian Sea ◽  
Caspian Seal

Pathological changes of the caspian seal fetus caused by negative processes in the mother’s organism under influence of disease and harmful environments are investigated. For that, parenchymal organs of the fetus are examined by histological methods. Active replacement of the fetus’ tissues by conjunctive tissue is detected in all organs, the most profound abnormalities are registered in the kidney and liver

CURRENT STATE OF CASPIAN SEAL POPULATION

2017 ◽  
pp. 35-45
Author(s):  
Vasilii Vladimirovich Kuznetsov
Keyword(s):  
Caspian Sea ◽  
Ecological Monitoring ◽  
Water Area ◽  
Fishing Effort ◽  
Winter Period ◽  
The Caspian Sea ◽  
Current State ◽  
Seal Population ◽  
Ship Route ◽  
Caspian Seal

The work presents Caspian seal study review. The study gives investigation results on the current state of Caspian seal population, as well as advanced techniques of determining the number of offspring and producing females. In February 2012 during reproduction period the instrumental air-accounting survey was carried out on ice-water area in the Northern part of the Caspian Sea. For the first time in the history of the air-accounting investigations of seals in the Caspian Sea scientists used thermovision camera survey IK-scanner "Malakhit-M" which helped specify the number of white-coat seals and greatly improve deciphering methods of the obtained materials. The authors discuss the drawbacks of the earlier air-surveys of the Caspian seals (made before 2012) carried out by a group of researches. The work gives characteristics of nutrient resources of the Caspian Sea and annual food necessity of Caspian seal population. The nutrient base of seals is sound and food stocks tend to grow in the future. The work gives the reasons of decrease of seal catch since 1967; it is associated with the reduction of the fishing effort and re-orientation in winter period by the method of marine fisheries. The article shows that ship route accounting alive and dead species in different parts of the Caspian Sea which was used for ecological monitoring of the population permits to effectively control the changes of seal number, including mass epizootics. In recent years ship-route accounting has shown the stable dynamics of average concentrations of seals in the Northern, Middle and Southern parts of the Caspian Sea. Ship-route accounting presents the up-to-date total number of the seal population.

scholarly journals Sea ice phenology in the Caspian Sea

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Forough Fendereski
Keyword(s):  
Sea Ice ◽  
Caspian Sea ◽  
Temporal Variations ◽  
Trophic Levels ◽  
Spatial And Temporal Patterns ◽  
The Caspian Sea ◽  
Ice Melt ◽  
Covered Area ◽  
Phonological Features ◽  
Caspian Seal

To understand the spatial and temporal variations in the extent and timing of sea ice in the Caspian Sea (CS), 15 years of sea ice presence and its phenology (freeze-up, break-up, and duration) were studied in the Northern CS (NCS) for a period from 2004 to 2018. This study indicated that the percentage of sea ice covered area in the CS showed fluctuations ranging from 54.2% in 2004 to more than 89% in 2006 and 2008. This study, furthermore, found regional differences within the NCS in sea ice phonological features during 2004 to 2018. Specifically, earlier sea ice formation, later ice melt, and longer ice periods were observed in the eastern than the western NCS. Noticeable interannual changes were also observed in the timing and duration of the NCS ice (2004-2018). However, most parts of the NCS did not show significant trends (P>0.05) in the formation, decay, and duration of sea ice and their interannual variability. The observed spatial and temporal patterns in the CS ice can have implications for phytoplankton blooms and higher trophic levels, such as fish and endangered Caspian seal populations and merits further investigation.

scholarly journals BIODIVERSITY OF OBJECTS OF AQUATIC BIORESOURCES OF THE VOLGA-CASPIAN FISHERY AREA

2017 ◽  
pp. 49-60
Author(s):  
Arsen Vyacheslavovich Mirzoyan ◽  
Raisa Pavlovna Khodorevskaya
Keyword(s):  
Caspian Sea ◽  
Sea Water ◽  
Natural Populations ◽  
Water Area ◽  
Commercial Fishing ◽  
Ecological Groups ◽  
The Caspian Sea ◽  
Sea Level Fluctuations ◽  
The North ◽  
Caspian Seal

In the course of the study there has been carried out the analysis of the data (both first-hand research and literature data), which characterize different species of fish, Caspian seal, river and crayfish and lobsters of the Volga-Caspian fishery basin. There have been listed families and species composition of the water biological resources on the water area of the Volga-Caspian fishery basin - 125 species and subspecies of fish (only 35 species are used in commercial fishing), belonging to 21 families. They have been divided into ecological groups according to spawning zones, preferred habitats and types of nutrition. Main features of ecological changes happened in the Caspian Sea for the last 65-70 years and resulted in drastic drop of fish catch volumes including sturgeons have been considered. In the populations of all sturgeon species there is a marked trend to dominating the young fishes - up to 80%. Increase in the number and improved biological characteristics was registered only in anadromous herring ( Alosa kessleri kessleri ) sires. Caspian seal retains the number of population on the level of the average annual figures, which is related to the favorable conditions for fattening and absence of critical epizootic situations. Materials on the long-term changes in the level of the Caspian Sea have been analyzed. The correspondence of sea level fluctuations and the size of commercial catches has been studied. The recommended measures for maintaining and development of the fishery complex in the Russian area of the Caspian basin (the Russian region) have been listed. The preservation of natural populations of all fish species, especially sea fish, anadromous fish of the Caspian Sea seems to be possible only if there are coordinated actions of all littoral states for preventing sea water pollution in the process of exploration and extraction of raw hydrocarbons, providing international inspections over preventive measures and creating the preserve zone in the North of the Caspian Sea (Russia, Kazakhstan).

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.

On the type locality of the steppe ribbon racer, Psammophis lineolatus (Brandt, 1838) (Serpentes: Lamprophiidae)

2020 ◽  
Vol 324 (2) ◽  
pp. 262-272
Author(s):  
I.V. Doronin ◽  
T.N. Dujsebayeva ◽  
K.M. Akhmedenov ◽  
A.G. Bakiev ◽  
K.N. Plakhov
Keyword(s):  
Caspian Sea ◽  
Type Specimen ◽  
Type Locality ◽  
Eastern Coast ◽  
Zoological Museum ◽  
Western Coast ◽  
The Caspian Sea ◽  
Original Species ◽  
Academy Of Sciences ◽  
Made In

The article specifies the type locality of the Steppe Ribbon Racer. The holotype Coluber (Taphrometopon) lineolatus Brandt, 1838 is stored in the reptile collection of the Zoological Institute of the Russian Academy of Sciences (ZISP No 2042). Literature sources provide different information about the type locality. A mistake has been made in the title of the work with the original species description: the western coast of the sea was indicated instead of the eastern one. The place of capture was indicated as “M. Caspium” (Caspian Sea) on the label and in the reptile inventory book of the Zoological Museum of the Academy of Sciences. The specimen was sent to the museum by G.S. Karelin. The “1842” indicated on the labels and in the inventory book cannot be the year of capture of the type specimen, just as the “1837” indicated by A.M. Nikolsky. In 1837, Karelin was in Saint Petersburg and in 1842 in Siberia. Most likely, 1837 is the year when the collection arrived at the Museum, and 1842 is the year when the information about the specimen was recorded in the inventory book (catalog) of the Zoological Museum of the Academy of Sciences. In our opinion, the holotype was caught in 1932. From Karelin’s travel notes of the expedition to the Caspian Sea in 1832, follows that the snake was recorded in two regions adjacent to the eastern coast of the Caspian Sea – Ungoza Mountain (“Mangyshlak Mountains”) and site of the Western Chink of Ustyurt between Zhamanairakty and Kyzyltas Mountains (inclusive) on the northeast coast of Kaydak Sor (“Misty Mountains”). In our article, Karelin’s route to the northeastern coast of the Caspian Sea in 1832 and photographs of these localities are given. The type locality of Psammophis lineolatus (Brandt, 1838) should be restricted to the Mangystau Region of the Kazakhstan: Ungoza Mountain south of Sarytash Gulf, Mangystau (Mangyshlak) Penninsula (44°26´ N, 51°12´ E).

ICE CONDITIONS IN THE NORTH-WESTERN PART OF THE CASPIAN SEA IN THE MODERN PERIOD

2020 ◽  
Vol 19 (6) ◽  
pp. 4-17
Author(s):  
Nepomenko Leonid ◽  
◽  
Popova Natalia ◽  
Zubanov Stepan ◽  
Ostrovskaya Elena ◽  
...  
Keyword(s):  
Caspian Sea ◽  
The Caspian Sea ◽  
The North ◽  
Modern Period ◽  
Ice Conditions ◽  
North Western
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