scholarly journals The effects of stock enhancement of pikeperch (Sander lucioperca) in Iranian coastal waters of the Caspian Sea

2007 ◽  
Vol 64 (5) ◽  
pp. 973-980 ◽  
Author(s):  
Shahram Abdolmalaki ◽  
Iwona Psuty
Keyword(s):  
Coastal Waters ◽  
Caspian Sea ◽  
Stock Enhancement ◽  
Early Years ◽  
Predatory Fish ◽  
Market Demand ◽  
Sander Lucioperca ◽  
The Caspian Sea ◽  
Artificial Culture ◽  
Abundant Population

Abstract Abdolmalaki, S., and Psuty, I. 2007. The effects of stock enhancement of pikeperch (Sander lucioperca) in Iranian coastal waters of the Caspian Sea. – ICES Journal of Marine Science, 64: 973–980. Annual landings of pikeperch (Sander lucioperca) in Iranian coastal waters of the Caspian Sea in the early years of its exploitation, the late 1920s and early 1930s, reached some 3000 t. However, after 1935, catches declined drastically through overfishing, declining sea level, and the destruction of spawning grounds in the Anzali Lagoon. In 1990, Iran initiated a programme of artificial culture to enhance the local stock. The aim of the programme was and still is to restore the formerly abundant population of this predatory fish and to increase the profitability of the beach-seine fisheries of fishers who had stopped deploying gillnets, which pose a threat to the valuable species of sturgeon in the Caspian. Analysis of the age composition of pikeperch catches indicates that the use of beach-seines does not prevent overfishing of young pikeperch released as fingerlings in the same calendar year in which the fishing season started. No undersized fish are discarded back into the sea, because there is market demand for even the smallest fish, and a lack of communication exists between the programme beneficiaries and the management and research units. Some 15 years after it was initiated, the effectiveness of stock enhancement at a level of 4–6million fry per year remains uncertain.

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.

Trace element accumulation in fishes collected from coastal waters of the Caspian Sea

2005 ◽  
Vol 51 (8-12) ◽  
pp. 882-888 ◽  
Author(s):  
Yasumi Anan ◽  
Takashi Kunito ◽  
Shinsuke Tanabe ◽  
Igor Mitrofanov ◽  
David G. Aubrey
Keyword(s):  
Trace Element ◽  
Coastal Waters ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Element Accumulation ◽  
Trace Element Accumulation

scholarly journals MICROALGAE FROM THE COASTAL WATERS OF TYULENY ISLAND IN THE CASPIAN SEA

2019 ◽  
Vol 14 (2) ◽  
pp. 120-131
Author(s):  
R. M. Barkhalov ◽  
A. A. Abdurakhmanova ◽  
F. Sh. Amaeva
Keyword(s):  
Coastal Waters ◽  
Caspian Sea ◽  
Biomass Concentration ◽  
Water Area ◽  
Trophic Chain ◽  
The Caspian Sea ◽  
Standard Procedures ◽  
Water Surface Layer ◽  
Rich Flora ◽  
Positive Effect

Aim. In this work, we set out to study the composition of a phytoplankton community in an important fishery area, the coastal water area of Tyuleny Island in the Caspian Sea.Methods. We present the results of seasonal observations (2016) on the state of phytoplankton in the coastal waters of Tyuleny Island in the Caspian Sea. In total, 120 phytoplankton samples were collected at four stations from the water surface layer (May–October) using the Nansen bottle and subsequent fixation by Lugolʹs solution. Sedimentation and concentration were carried out using standard procedures. The samples were processed in the Nageotte chamber with a volume of 0.1 ml under a light microscope.Results. According to the research results (2016), 103 species and varieties of microalgae were found in the phytoplankton samples collected from the water area of Tyuleny Island. The microalgae were represented by four divisions: Bacillariophyta – 49 species, Cyano‐ phyta – 24 species, Chlorophyta – 23 species and Pyrrophyta – 7 species. The greatest species diversity of phytoplankton in the studied water area was noted during the autumn period (61 spe‐ cies). In general, phytoplankton was found to be distributed homogeneously throughout the coastal area of the island, with the biomass concentration not reaching 1 g/m3.Conclusion. In 2016, favorable hydrological and hydrochemical conditions for the development of microalgae were observed. The desalinated water around Tyuleny Island, which is well warmed in the summer and does not freeze in the winter, contributed to the development of rich flora. Although bi‐ omass values were not high due to the prevalence of small‐celled microalgae in phytoplankton, in general, it should have a positive effect on the development of subsequent links in a trophic chain, as well as promote an increase in the productivity of waters of the Northern Caspian Sea. 

Optimization and partial purification of a high-activity lipase synthesized by a newly isolated Acinetobacter from offshore waters of the Caspian Sea under solid-state fermentation

RSC Advances ◽  
2015 ◽  
Vol 5 (16) ◽  
pp. 12052-12061 ◽  
Author(s):  
Samira Moradi ◽  
Seyed Hadi Razavi ◽  
Seyyed Mohammad Mousavi ◽  
Seyed Mohammad Taghi Gharibzahedi
Keyword(s):  
Solid State ◽  
High Activity ◽  
Solid State Fermentation ◽  
Coastal Waters ◽  
Caspian Sea ◽  
Partial Purification ◽  
Extracellular Lipase ◽  
The Caspian Sea ◽  
Mesophilic Bacterium

A new aerobic mesophilic bacterium was isolated from the southern coastal waters of the Caspian Sea which substantially produced an extracellular lipase in solid-state fermentation using milled coriander seeds (MCS) as support substrate.

Oil pollution in the Caspian Sea coastal waters

2006 ◽  
Vol 26 (4) ◽  
pp. 347
Author(s):  
Ahmad Khatoonabadai ◽  
Ahmadreza R. Mohammadi Dehcheshmeh
Keyword(s):  
Coastal Waters ◽  
Caspian Sea ◽  
Oil Pollution ◽  
The Caspian Sea

scholarly journals Effects of the Invasive Ctenophore Species, Mnemiopsis Leidyi, on the Caspian Sea

2013 ◽  
Vol 15 (1) ◽  
pp. 117-126
Author(s):  
Zahra Khoshnood ◽  
Reza Khoshnood ◽  
Mehdi Ghobeitihasab
Keyword(s):  
Invasive Species ◽  
Coastal Waters ◽  
Caspian Sea ◽  
Habitat Destruction ◽  
Significant Decline ◽  
Ecological Impacts ◽  
Economic Losses ◽  
Mnemiopsis Leidyi ◽  
The Caspian Sea ◽  
Wide Range

ABSTRACT Human interventions on the Earth’s natural systems are evident even in remote regions of the Antarctic and rain forests deep within the Amazon. In addition to human-induced climate change and habitat destruction, an emerging anthropogenic threat to biodiversity is the drastic species re-distribution (the movement of species from one place to another due to human intervention) at a global scale. This creates fertile conditions for biological invasions which in turn cause substantial economic and ecological losses. These human-mediated invasions, often referred to as “biological pollution”, are a worldwide problem that is increasing in frequency and magnitude, causing significant damage to the environment, economy and human health. Bioinvasions have strong impact on biodiversity and ecosystem functioning and stability. They are ranked as the second most important threat to biodiversity (after habitat destruction) by the World Conservation Union. The Ctenophore, Mnemiopsis leidyi, is one of the invasive species that naturally lives in the Atlantic coastal waters of North America and South America, but discovered in Azov, Black, Caspian, North, Baltic and Mediterranean (north-eastern part) seas in early 1980s. It seems that the main factor of its redistribution was the ballast waters of ships. As an alien species, Mnemiopsis leidyi caused many alterations in the Caspian Sea ecosystems. The fact that it feeds on the eggs of native fish Clopeonella spp., has resulted in a significant decline of its population; Clopeonella spp. were the main source of industrial fishing in the Caspian Sea and also the main source of food for precious fish species, the sturgeons, and therefore, their decline has caused a huge economical loss for the area's inhabitants and a significant decline of sturgeon populations. This species has caused massive ecosystem changes and substantial economic losses in the late 1980s-1990s, and it has been recognized as a problem of main ecological concern for the sustainable development of the region, together with the high level of anthropogenic pressures on the Caspian Sea ecosystems. Some special characteristics of this species, such as adaptation to a wide range of salinity and temperature, high capability of reproduction, hermaphroditism and dissogeny, have led to huge increases of its mass, especially in southern regions of the Caspian Sea, the coastal waters of Iran. In addition, it has become clear that this species does not have any natural predators in the Caspian Sea, and also that it can feed on any organisms smaller than itself in size. Owing to these facts, it is a huge ecological threat for the Caspian Sea ecosystems. The aim of the present paper is to review the biological and ecological impacts of this invasive species on the Caspian Sea ecosystems.

Russia wins most from Caspian deal despite concessions

2018 ◽  
Keyword(s):  
Black Sea ◽  
Coastal Waters ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Content Type

Subject Unpicking the Caspian Sea convention. Significance A convention signed by the five states around the Caspian Sea achieves a key strategic aim for Russia by excluding foreign navies and giving its warships free passage outside its neighbours' coastal waters. Iran will also be comforted by the banning of NATO and other forces. The agreement fails to rule on how subsea resources should be divided, leaving this to subsequent, possibly bilateral arrangements. Russia has conceded that Turkmenistan can lay a pipeline under the sea. Impacts Russia is offering to resume Turkmen gas purchases, reducing the urgency of a trans-Caspian pipeline. Caspian and Black Sea naval vessels will act in consort, using connecting Russian waterways. Russia has offered to prolong a moratorium on sturgeon fishing, but poaching is so common that stocks are likely to dwindle.

Iran in Motion

2021 ◽  
Author(s):  
Mikiya Koyagi
Keyword(s):  
Persian Gulf ◽  
Caspian Sea ◽  
Early Years ◽  
The Caspian Sea ◽  
The North ◽  
Migrant Laborers ◽  
Global Transport ◽  
Railway Workers ◽  
The Persian Gulf ◽  
Bodies Of Water

Completed in 1938, the Trans-Iranian Railway connected Tehran to Iran's two major bodies of water: the Caspian Sea in the north and the Persian Gulf in the south. Iran's first national railway, it produced and disrupted various kinds of movement—voluntary and forced, intended and unintended, on different scales and in different directions—among Iranian diplomats, tribesmen, migrant laborers, technocrats, railway workers, tourists and pilgrims, as well as European imperial officials alike. Iran in Motion tells the hitherto unexplored stories of these individuals as they experienced new levels of mobility. Drawing on newspapers, industry publications, travelogues, and memoirs, as well as American, British, Danish, and Iranian archival materials, Mikiya Koyagi traces contested imaginations and practices of mobility from the conception of a trans-Iranian railway project during the nineteenth-century global transport revolution to its early years of operation on the eve of Iran's oil nationalization movement in the 1950s. Weaving together various individual experiences, this book considers how the infrastructural megaproject reoriented the flows of people and goods. In so doing, the railway project simultaneously brought the provinces closer to Tehran and pulled them away from it, thereby constantly reshaping local, national, and transnational experiences of space among mobile individuals.

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