Stock status, environmental factors and reproduction efficiency of the anchovy sprat population (Clupeonella Engrauliformis Borodin) in modern conditions

Fisheries ◽  
2021 ◽  
Vol 2021 (6) ◽  
pp. 76-79
Author(s):  
Vyacheslav Razinkov ◽  
Yuri Paritsky ◽  
Anna Mikhailova ◽  
Alisher Khursanov ◽  
Yulia Nikolaevna Grozesku
Keyword(s):  
Environmental Factors ◽  
Caspian Sea ◽  
Main Part ◽  
Early Ontogenesis ◽  
Annual Growth ◽  
Direct Impact ◽  
The Caspian Sea ◽  
Stock Status ◽  
Marine Fishing ◽  
Reproduction Efficiency

Until the end of the XX century, anchovy sprat was the leading object of marine fishing in the Caspian Sea. At the beginning of the XXI century, there was a mass death of this species, as well as an outbreak of the number of mnemiopsis comb - a powerful consumer of feed zooplankton. There was a redistribution of keel clusters in the sea. The main part of the fishing stock of keels began to be distributed in the Middle Caspian Sea. The main object of marine fishing has become an ordinary sprat. In recent years (2015-2020), there has been an increase in the number of anchovy sprats. The materials of keel surveys also confirm the annual growth in the number of juvenile sprats. This paper presents the results of recent years of observations, shows the dynamics of the number and biomass of the population, the parent part of the herd, total fertility. The efficiency of spawning and the survival coefficients of the generation in early ontogenesis are shown. Environmental factors that have a direct impact on the formation of the anchovy sprat stock are described.

scholarly journals The black sea: the energetic corridor between Europe and Asia

2016 ◽  
Vol 18 (35) ◽  
pp. 6-15
Author(s):  
Roberto Luis Brocate Pirón ◽  
Jerónimo Rios Sierra
Keyword(s):  
Black Sea ◽  
Caspian Sea ◽  
Oil And Gas ◽  
The Black Sea ◽  
Direct Impact ◽  
Strategic Interactions ◽  
The Caspian Sea ◽  
European Context ◽  
Vladimir Putin ◽  
Bosphorus Strait

The Black Sea is one of the most important geostrategic enclaves in the oil and gas connection linking Asia with Europe and Russia. However, the presence of Turkey on the Bosphorus Strait directly affects how the geo-strategic interactions of the region develop. The crisis in Ukraine has spurred Turkish-Russian relations, positioning the country as a key player in the gas transit to Eurasia and projecting the aspirations of the Kremlin, under President Vladimir Putin has sought to regain an influential weight in the region - as shown by the crisis in Georgia or, more recently, Crimea - especially in the Black Sea and the Caspian Sea. Thus, the following work seeks to put a little light on new relationships and geopolitical aspirations, especially in Russia and Turkey and, likewise, have a direct impact on the European context.

Host and environmental factors for gastric cancer in Babol, the Caspian Sea Coast, Iran

2007 ◽  
Vol 16 (3) ◽  
pp. 192-195 ◽  
Author(s):  
Reza Ghadimi ◽  
Hassan Taheri ◽  
Sadao Suzuki ◽  
Mehrdad Kashifard ◽  
Akihiro Hosono ◽  
...  
Keyword(s):  
Gastric Cancer ◽  
Environmental Factors ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Sea Coast

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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