scholarly journals THE STATE OF THE ICHTHYOFAUNA OF THE SELETA RIVER

2021 ◽  
Vol 6 (12(62)) ◽  
pp. 4-10
Author(s):  
N.A. Akhmetzhanova ◽  
S.N. Akhmedinov
Keyword(s):  
Fish Species ◽  
The State ◽  
Entire Length ◽  
Commercial Fish ◽  
The North ◽  
Current State ◽  
The Village

The Silety River originates in the territory of Akmola region near the village of Bozaygyr in the Shortandinsky district and flows into the lake Silety-Teniz, located on the territory of the Ualikhanov district of the North Kazakhstan region. In a number of localities, the Silety River is a drinking reservoir. In addition, the Silety river is of great recreational importance, and serves as a place for amateur fishing. In a number of localities, the Silety River is a drinking reservoir. In addition, the Silety river is of great recreational importance, and serves as a place for amateur fishing. In a number of localities, the Silety River is a drinking reservoir. In addition, the Silety river is of great recreational importance, and serves as a place for amateur fishing. All mass species of fish living in the Sileta River, they are found throughout its entire length, thus, the composition of the commercial ichthyofauna has similarities in all commercial areas. The article provides information about the features and current state of the ichthyofauna of the Sileti River. The assessment of the current state of stocks of the main commercial fish species is given.

THE CURRENT STATE OF THE BLACK SEA COASTAL GEOSYSTEMS IN THE NORTH-EASTERN SECTOR

2017 ◽  
Author(s):  
Eugeny Godin ◽  
Eugeny Godin ◽  
Yury Goryachkin ◽  
Yury Goryachkin ◽  
Vyacheslav Dolotov ◽  
...  
Keyword(s):  
Observational Data ◽  
Coastal Zone ◽  
Black Sea ◽  
The State ◽  
The Black Sea ◽  
Integrated Analysis ◽  
Eastern Sector ◽  
The North ◽  
Current State ◽  
North Eastern

This work is a multi-disciplinary research aimed to develop common approaches to estimating the current state and forecasting evolution of coastal geosystems. From 2010 to now, the state of coastal zone geosystems of the Crimean and Caucasian Russian coast has been studied. The research tasks are solved using up-to-date IT based integrated analysis of historical and new observational data.

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.

THE CURRENT STATE OF THE BLACK SEA COASTAL GEOSYSTEMS IN THE NORTH-EASTERN SECTOR

2017 ◽  
Author(s):  
Eugeny Godin ◽  
Eugeny Godin ◽  
Yury Goryachkin ◽  
Yury Goryachkin ◽  
Vyacheslav Dolotov ◽  
...  
Keyword(s):  
Observational Data ◽  
Coastal Zone ◽  
Black Sea ◽  
The State ◽  
The Black Sea ◽  
Integrated Analysis ◽  
Eastern Sector ◽  
The North ◽  
Current State ◽  
North Eastern

This work is a multi-disciplinary research aimed to develop common approaches to estimating the current state and forecasting evolution of coastal geosystems. From 2010 to now, the state of coastal zone geosystems of the Crimean and Caucasian Russian coast has been studied. The research tasks are solved using up-to-date IT based integrated analysis of historical and new observational data.

scholarly journals Indicator-based status assessment of commercial fish species in the North Sea according to the EU Marine Strategy Framework Directive (MSFD)

2013 ◽  
Vol 70 (3) ◽  
pp. 694-706 ◽  
Author(s):  
Wolfgang Nikolaus Probst ◽  
Matthias Kloppmann ◽  
Gerd Kraus
Keyword(s):  
North Sea ◽  
Fish Species ◽  
Marine Strategy Framework Directive ◽  
Commercial Fish ◽  
Fish Stocks ◽  
The North ◽  
The Status ◽  
Status Assessment ◽  
The North Sea ◽  
The Eu

Abstract Probst, W. N., Kloppmann, M., and Kraus, G. Indicator-based status assessment of commercial fish species in the North Sea according to the EU Marine Strategy Framework Directive (MSFD). – ICES Journal of Marine Science, 70: 694–706. The EU Marine Strategy Framework Directive (MSFD) is structured into eleven descriptors of good environmental status (GES). For each descriptor the current status of the marine environment should be assessed against its GES using ecosystem criteria and indicators. Within Descriptor 3 (D3) the MSFD addresses the status of exploited fish stocks according to three criteria (exploitation rate, stock size and size structure). This study performed an MSFD-compliant assessment of exploited fish stocks in the North Sea by aggregating data from analytical stock assessments and scientific research surveys to calculate indicator metrics for each criterion within each stock time-series. A stock achieved GES, when each indicator for each criterion had a good status. Of 43 assessed fish stock suggested by the EU Data Collection Framework, 63% (27) achieved GES. Though the MSFD explicitly demands that all exploited fish stocks achieve GES, this demand may be challenged by reality, because the status of exploited stocks depends not only on fishing impacts, but also on environmental conditions and ecological interactions. Therefore an alternative approach based on binomial distributions is presented to define limits for GES at the descriptor level. The implications and pitfalls of the applied assessment methods are discussed.

Tool-kits and Burial Rites: The Case of the Janisławice Mesolithic Grave

1993 ◽  
Vol 59 ◽  
pp. 105-112
Author(s):  
Andrzej Jacek Tomaszewski ◽  
Richard Willis
Keyword(s):  
The State ◽  
River Valley ◽  
Sitting Position ◽  
Stratigraphic Sequence ◽  
Central Poland ◽  
The North ◽  
North Bank ◽  
Burial Rites ◽  
The Village ◽  
Local Farmers

In the autumn of 1936, a prehistoric grave was discovered near the village of Janislawice, Skierniewice Voievodom, central Poland, by two local farmers whilst digging for gravel. The grave was located on the north bank of the Lupia River (a tributary of the Bzura River), 13m above the river valley and 159 m above OD. It was dug into gravelly-sandy fluvioglacial deposits of the penultimate glaciation, on the slope of a kame hill (fig. 1). Although the grave was partially damaged in the discovery, in April of the following year the site was investigated by K. Jazdzewski, from the State Archaeological Museum in Warsaw. A stratigraphic sequence was recorded, and the skeleton and a variety of grave goods were excavated.The single skeleton had been placed in a sitting position, the legs outstretched and the back leaning against the wall of the grave pit. Red ochre powder was also probably present in small quantities in the fill. The skeleton was that of a man, aged about 30, having a ‘robust’ build and showing craniometrical similarities to modern Lapp populations (Steslicka-Mydlarska 1954).

scholarly journals Parasitic nematodes infecting commercial fishes off the coast of Algeria

2020 ◽  
Vol 30 (30) ◽  
pp. 73-82
Author(s):  
Nassima Saadi ◽  
Jean-Paul Trilles ◽  
Rachid Amara ◽  
Zouhir Ramdane
Keyword(s):  
Food Safety ◽  
Health Risk ◽  
Fish Species ◽  
Nematode Species ◽  
Parasitic Nematodes ◽  
North African ◽  
Trachurus Trachurus ◽  
Benthic Species ◽  
Commercial Fish ◽  
The North

A total of 1229 specimens representing 11 commercial fish species caught off the coast of Algeria were examined for parasitic nematodes (larvae) from November 2015 to April 2017. Four nematode species belonging to Anisakis (1 species) and Hysterothylacium (3 species) genera were identified. The presence of A. simplex parasitism in Trachurus trachurus was significantly related to the length (p < 0.05) of the fish and the season of its capture (p < 0.05), but not to its sex (p = 0.61%). Large benthic species and some pelagic species show high rates of infection with parasitic nematodes and therefore pose considerable health risk (anisakiasis) thereby compromising food safety. An up-to-date reference checklist of nematode species collected from the North African fish species was compiled with specific relationships between parasitic nematodes and their hosts and/or their collecting location indicated.

Benthic invertebrate communities in the water areas of the Volgograd reservoir near the villages Akhmat and Zolotoye as one of the characterization of conditions for commercial fish reproduction in 2020

2021 ◽  
pp. 31-47
Author(s):  
Dmitry Yurievich Tyulin ◽  
Aleksey Alekseevich Vasiliev ◽  
Anastasiya Andreevna Anuryeva ◽  
Roman Romanovich Radionov ◽  
Anastasiya Romanovna Plotko ◽  
...  
Keyword(s):  
Net Primary Production ◽  
Benthic Invertebrate ◽  
Water Area ◽  
The State ◽  
Fish Reproduction ◽  
Commercial Fish ◽  
Invertebrate Communities ◽  
Volgograd Reservoir ◽  
Benthic Invertebrate Communities ◽  
The Village

The main factor affecting the success of the reproduction of limnophilic fish is the level height and duration of the spring flood with uniform heating of the water. However, the efficiency of fish reproduction also depends on other factors, for example, on the development of the food supply for early juveniles. In 2020, in the water area of the Volgograd reservoir near the villages Akhmat and Zolotoye, according to the results of catches of fry net, developed very unfavorable conditions for the reproduction of commercial fish. The values of production indicators (net primary production and the rate of respiration of the plankton community) in 2020 turned out to be minimal. The dynamics of the abundance, and especially the biomass of benthic invertebrate communities, turned out to be very similar for both water areas in 2018 and very different in 2020. In terms of abundance, among benthic invertebrate communities, in the water area near the village Zolotoye in July 2020, was dominated by oligochaetes and chironomids, and oligochaetes in terms of biomass. At the station near the village Akhmat in July was dominated by chironomids in terms of numbers, and oligochaetes in terms of biomass. In August and September, both in terms of abundance and biomass, oligochaetes dominated in both water areas. There is a correlation between the state of production processes and the state of benthic invertebrate communities in the reservoir. However, the efficiency of fish reproduction correlates, first of all, with the level and temperature regimes of the reservoir during the spawning and feeding period. The decrease in the proportion of underyearlings of crucian carp and perch feeding on benthic invertebrate communities in the catch of fry net in 2020 may be due to both an unfavorable level regime and a drop in the feeding capacity of the water areas.

scholarly journals CURRENT STATE OF POPULATIONS OF THE MAIN COMMERCIAL FISH SPECIES OF THE SMALL ARAL SEA

2021 ◽  
Vol 88 (3) ◽  
Author(s):  
S. Berdiakhmetkyzy ◽  
S.Zh. Assylbekova ◽  
А.M. Abdybekova ◽  
Т.Т. Barakbaev
Keyword(s):  
Fish Species ◽  
Aral Sea ◽  
Commercial Fish ◽  
Current State
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