Parasites of fingerling herringClupea harengusL.: ecology and fine morphology

2007 ◽  
Vol 81 (2) ◽  
pp. 199-217 ◽  
Author(s):  
Hassan Rahimian
Keyword(s):  
West Coast ◽  
Parasite Fauna ◽  
Clupea Harengus ◽  
North East ◽  
The North ◽  
New Information ◽  
Young Of The Year ◽  
The Baltic ◽  
Fine Morphology ◽  
Hysterothylacium Aduncum

AbstractThe parasite fauna of young-of-the-year herringClupea harengusL., off Gullmarsfjord and Brofjorden, west coast of Sweden, was studied between May and October for 4 years, from 1994 to 1997. Fifteen species of parasites were found: two Protozoa –Trichodina sp.andCeratomyxa auerbachi; one species of uncertain affinity –Ichthyophonus hoferi; two Monogenea –Gyrodactylus harengiandPseudanthocotyloides heterocotyle; five Digenea –Cryptocotyle linguametacercariae,Cercaria pythionikemetacercariae,Hemiurus luehei,Lecithaster confususandPseudobacciger harengulae; three Cestoda plerocercoids –Bothriocephalussp., an acrobothriid and a tetraphyllid; one Nematoda –Hysterothylacium aduncumlarva; and one Copepoda –Caligus elongatus. The number of species found in this study represents more than one-sixth of all parasites reported in herring worldwide and all parasites were acquired locally. The parasite fauna of herring from the west coast of Sweden is compared with that of herring from the Baltic Sea and other areas of the north-east Atlantic. The prevalence and intensity of parasites are presented and discussed. Morphological descriptions are based on both light and scanning electron microscopy and new features are described. Possible applications of this new information about the parasite fauna, in different areas of fisheries and fish biology studies, are discussed.

COMPARATIVE CHARACTERISTIC OF SEA RADIANCE COEFFICIENT SPECTRA MEASURED REMOTELY IN COASTAL WATERS OF FIVE SEAS

2017 ◽  
Author(s):  
Vera Rostovtseva ◽  
Vera Rostovtseva ◽  
Igor Goncharenko ◽  
Igor Goncharenko ◽  
Dmitrii Khlebnikov ◽  
...  
Keyword(s):  
Sea Water ◽  
Calibration Method ◽  
Aral Sea ◽  
Comparative Characteristic ◽  
The Black Sea ◽  
North East ◽  
The North ◽  
Water Constituents ◽  
Characteristic Features ◽  
The Baltic

Sea radiance coefficient, defined as the ratio of the sunlight reflected by the water bulk to the sunlight illuminating the water surface, is one of the most informative optical characteristics of the seawater that can be obtained by passive remote sensing. We got the sea radiance coefficient spectra by processing the data obtained in measurements from board a moving ship. Using sea radiance coefficient optical spectra it is possible to estimate water constituents concentration and their distribution over the aquatory of interest. However, thus obtained sea radiance coefficient spectra are strongly affected by weather and measurement conditions and needs some calibration. It was shown that practically all the spectra of sea radiance coefficient have some generic peculiarities regardless of the type of sea waters. These peculiarities can be explained by the spectrum of pure sea water absorption. Taking this into account a new calibration method was developed. The measurements were carried out with the portative spectroradiometers from board a ship in the five different seas: at the north-east coast of the Black Sea, in the Gdansk Bay of the Baltic Sea, in the west part of the Aral Sea, in the Kara Sea with the Ob’ Bay and in the Philippine Sea at the coast of Taiwan. The new method of calibration was applied to the obtained spectra of the sea radiance coefficient that enabled us to get the corresponding absorption spectra and estimate the water constituents concentration in every region. The obtained concentration estimates were compared to the values obtained in water samples taken during the same measurement cycle and available data from other investigations. The revealed peculiarities of the sea radiance coefficient spectra in the aquatories under exploration were compared to the corresponding water content and some characteristic features were discussed.

The Forgotten Child of the Wider Corded Ware Family: Russian Fatyanovo Culture in Context

2020 ◽  
Vol 86 ◽  
pp. 65-93 ◽  
Author(s):  
Kerkko Nordqvist ◽  
Volker Heyd
Keyword(s):  
Material Culture ◽  
Bronze Age ◽  
Cultural Landscape ◽  
Animal Husbandry ◽  
Volga River ◽  
North East ◽  
The North ◽  
European Part Of Russia ◽  
The Baltic ◽  
River Valleys

The Fatyanovo Culture, together with its eastern twin, the Balanovo Culture, forms part of the pan-European Corded Ware Complex. Within that complex, it represents its eastern expansion to the catchment of the Upper and Middle Volga River in the European part of Russia. Its immediate roots are to be found in the southern Baltic States, Belarus, and northern Ukraine (the Baltic and Middle-Dnepr Corded Ware Cultures), from where moving people spread the culture further east along the river valleys of the forested flatlands. By doing so, they introduced animal husbandry to these regions. Fatyanovo Culture is predominately recognised through its material culture imbedded in its mortuary practices. Most aspects of every-day life remain unknown. The lack of an adequate absolute chronological framework has thus far prevented the verification of its internal cultural dynamics while overall interaction proposed also on typo-stratigraphical grounds suggests a contemporaneity with other representations of the Corded Ware Complex in Europe. Fatyanovo Culture is formed by the reverse movement to the (north-)east of the Corded Ware Complex, itself established in the aftermath of the westbound spread of Yamnaya populations from the steppes. It thus represents an important link between west and east, pastoralists and last hunter-gatherers, and the 3rd and the 2nd millennia bc. Through its descendants (including Abashevo, Sintashta, and Andronovo Cultures) it becomes a key component in the development of the wider cultural landscape of Bronze Age Eurasia.

scholarly journals Basic vocabulary of the Karelian and Vepsian languages in the linguistic and geographical aspect

2021 ◽  
Vol 11 (1) ◽  
pp. 90-101
Author(s):  
I. P. Novak ◽  
Keyword(s):  
Cluster Analysis ◽  
Statistical Method ◽  
Field Research ◽  
Research Centre ◽  
North East ◽  
The North ◽  
History Of ◽  
Dialect Classification ◽  
Basic Vocabulary ◽  
The Baltic

Introduction: Karelian and Vepsian vocabulary has been collected and studied by linguists from Russia and Finland for two centuries. An invaluable source for research in the dialectology of the North-East group of the Baltic-Finnish languages is the «Comparative and Onomasiological Dictionary of the Karelian, Vepsian and Sami Languages» (2007). The dictionary was prepared by staff of the Institute of Linguistics, Literature and History of the Karelian Research Centre of the Russian Academy of Sciences using field research data from 1979–1981. The article reports the main results of applying the statistical method of cluster analysis to the dictionary entries. Objective: the analysis of the basic vocabulary of the dialects of the Karelian and Vepsian languages in the linguistic and geographical aspect using the statistical method of cluster analysis (dialectometry method). Research materials: pre-encoded for being uploaded to the clustering software database lexical data from the «Comparative and Onomasiological Dictionary of the Karelian, Vepsian and Sami Languages» (about 43 thousand units). Results and novelty of the research: the scientific novelty of the research is the application of the statistical method of cluster analysis to large volumes of pre-encoded lexical dialect material. The results of the calculation confirm the conclusions made by linguists earlier regarding the unity of the Vepsian and Karelian languages, as well as the presence of a clear border between them. The question of determination of the linguistic status of the Ludic dialects, which has been the subject of discussions among Russian and Finnish linguists for decades, is resolved in favor of the Karelian dialect on the basis of the material involved in the analysis. The boundaries between clusters outlined by the clustering program for the Vepsian language coincided with its dialect classification. On the Karelian part of the final map, the main bundle of isoglosses shifted north of the border between the dialects of the language, which indicates a more mobile character of its lexical level. The results presented in the article and the method of obtaining them will be later used to develop a linguistically grounded classification of Karelian language dialects.

scholarly journals Les pêches de l’URSS dans l’Atlantique du Nord-Est et l’élargissement des zones de pêche exclusive

2005 ◽  
Vol 18 (1) ◽  
pp. 107-126
Author(s):  
François Carré
Keyword(s):  
Barents Sea ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
The Barents Sea ◽  
Average Production ◽  
Capelin Mallotus Villosus ◽  
Access Rights ◽  
The Baltic ◽  
Almost All

After the last war, the USSR set it self to increase the development of its ocean fisheries from its two North-East Atlantic seaboards on the Barents Sea and the Baltic. With a modernized fleet and almost complete freedom on the seas, its catch increased six fold between 1950 and 1976, going from 0,4 to 2,5 million tons per year, and Soviet fishermen could be found roaming on all the seas bordering Europe. However, as from 1977, this expansion was fiercely curtailed when coastal nations, including the USSR, established the 200-mile exclusive economic zone (EEZ) or mere exclusive fishing zone (EFZ), each being alloted almost all of its living resource s. More fishing grounds were lost by the USSR than gained, to the point where production suddenly fell in 1977 and it had to turn to fish of lesser quality, often used for industrial purposes, such as the Capelin (Mallotus villosus) and the blue Whiting (Micromesistius poutassou) which today make up to 60 % of all its catch off Northern Europe. The Soviet authorities reacted with flexibility and diversity, namely by increased fishing in the national exclusive zone, particularly in the Barents Sea, through negotiations leading to access rights to foreign waters, particularly those of Norway and the Faeroe Islands, and through a policy whereby it could purchase unprocessed fish from some members of the EEC. Thus Russian factory ships came to the British coasts to process mackerel delivered to them at sea by English and Scottish fishermen. It is through such a strategy of diversification, various examples of which may be found around the world, that the Soviets have succeeded in regaining grounds lost in 1977 and in reaching an average production of 1,7 million tons from 1977 to 1983 in the North-East Atlantic, this being 3 to 4 % less than that of 1970-76, notwithstanding the few purchases of fish made directly at sea.

Monopseudocuma a new genus from the North East Atlantic and redescription of Pseudocuma gilsoni Bacescu, 1950 (Cumacea: Pseudocumatidae)

Zootaxa ◽  
2006 ◽  
Vol 1203 (1) ◽  
pp. 39
Author(s):  
ALISON M. MCCARTHY ◽  
SARAH GERKEN ◽  
DAVID MCGRATH ◽  
GRACE P. MCCORMACK
Keyword(s):  
North Sea ◽  
West Coast ◽  
New Genus ◽  
East Atlantic ◽  
The West ◽  
The Past ◽  
North East ◽  
The North ◽  
The North Sea

The validity of Pseudocuma gilsoni B|cescu 1950 has been questioned in the past. The recent discovery of material in Irish waters, and in the North Sea, confirms the presence of the species in the North East Atlantic and provides the opportunity to present a full redescription. A new genus, Monopseudocuma, is erected to accommodate the species. A neotype is designated from the West coast of Ireland.

scholarly journals Black Sea Baric Depression

2015 ◽  
Vol 9 (1) ◽  
pp. 189-198
Author(s):  
Ion Isaia
Keyword(s):  
Black Sea ◽  
Atmospheric Pressure ◽  
The Black Sea ◽  
East Side ◽  
The Baltic Sea ◽  
North East ◽  
The North ◽  
Synoptic Conditions ◽  
The Baltic ◽  
High Atmospheric Pressure

Abstract This work is meant to demonstrate that, in the special synoptic conditions, on the surface of the Black Sea, a baric depression is being formed. This depression is formed when the Black Sea's water temperature is higher than the surrounding continental ground's temperature. There are situations when the baric depression of the Black Sea occurs because of the consequences of the movement of another baric depression from the east of the Mediterranean Sea to its north-east side. Due to the high atmospheric pressure of the continental zone that's surrounding the Black Sea, the baric depression will get a retrograde movement, towards the north or northwest. Eventually, this depression occludes in the eastern continental zone of Europe or even near the Baltic Sea. During a retrograde movement of a baric depression, the atmospheric precipitations will fall in big quantities, in many situations, causing floods.

scholarly journals Gene-associated markers can assign origin in a weakly structured fish, Atlantic herring

2015 ◽  
Vol 72 (6) ◽  
pp. 1790-1801 ◽  
Author(s):  
Dorte Bekkevold ◽  
Sarah J. Helyar ◽  
Morten T. Limborg ◽  
Einar E. Nielsen ◽  
Jakob Hemmer-Hansen ◽  
...  
Keyword(s):  
Clupea Harengus ◽  
Nucleotide Polymorphisms ◽  
Single Nucleotide ◽  
The North ◽  
Sustainable Products ◽  
The North Sea ◽  
Commercially Important ◽  
Mixed Origin ◽  
The Baltic ◽  
Management Issues

Abstract Regulations on the exploitation of populations of commercially important fish species and the ensuing consumer interest in sustainable products have increased the need to accurately identify the population of origin of fish and fish products. Although genomics-based tools have proven highly useful, there are relatively few examples in marine fish displaying accurate origin assignment. We synthesize data for 156 single-nucleotide polymorphisms typed in 1039 herring, Clupea harengus L., spanning the Northeast Atlantic to develop a tool that allows assignment of individual herring to their regional origin. We show the method's suitability to address specific biological questions, as well as management applications. We analyse temporally replicated collections from two areas, the Skagerrak (n = 81, 84, 66) and the western Baltic (n = 52, 52). Both areas harbour heavily fished mixed-origin stocks, complicating management issues. We report novel genetic evidence that herring from the Baltic Sea contribute to catches in the North Sea, and find support that western Baltic feeding aggregations mainly constitute herring from the western Baltic with contributions from the Eastern Baltic. Our study describes a general approach and outlines a database allowing individual assignment and traceability of herring across a large part of its East Atlantic distribution.

scholarly journals In situ target strength of the Baltic Sea herring and sprat

2004 ◽  
Vol 61 (3) ◽  
pp. 378-382 ◽  
Author(s):  
Tomas Didrikas ◽  
Sture Hansson
Keyword(s):  
Baltic Sea ◽  
Clupea Harengus ◽  
Target Strength ◽  
Fish Length ◽  
The North ◽  
Length Relationship ◽  
Stock Biomass ◽  
Acoustic Target ◽  
The North Sea ◽  
The Baltic

Abstract Using single- and split-beam hydroacoustic equipment (70 and 38 kHz), and gillnet and trawl catches, we derived the relationship TS = 25.5 log10 L − 73.6 (r2=0.95) between acoustic target strength (TS) and fish length (L, cm) for Baltic Sea herring (Clupea harengus membras L.) and sprat (Sprattus sprattus balticus (Schneider)). Fixing the slope to 20, which is a standard practice in hydroacoustics, gave TS = 20 log10 L − 67.8 (r2=0.91). Normally, the fisheries agencies around the Baltic use a TS–length relationship that is based mainly on data from the North Sea and the intercept-value in this equation is 3.4 dB lower than that reported in this paper. This difference corresponds to an approximately twofold difference in assessed stock biomass.

scholarly journals Rare earth elements pilot studies of the baltic marine sands enriched in heavy minerals

2016 ◽  
Vol 32 (4) ◽  
pp. 5-28 ◽  
Author(s):  
Stanisław Z. Mikulski ◽  
Regina Kramarska ◽  
Grzegorz Zieliński
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Heavy Minerals ◽  
Beach Sand ◽  
Sand Sample ◽  
High Concentration ◽  
Pilot Studies ◽  
North East ◽  
The North ◽  
The Baltic

Abstract The carried out pilot work on the concentration of rare earth elements (REE) in the Baltic marine sands from the Odra and Słupsk Banks showed that in some places their accumulations are quite interesting in terms of the placer deposits and may be the subject of an interesting prospecting project. The results of ICP-MS and electron microprobe (CAMECA SX-100) investigation confirm the close relationship of REE concentration to heavy minerals content in the sediments of marine sands. It is indicated, in addition to monazite, as a primary mineral carrier of rare earth elements. The vast preponderance of light REE is noted in the samples of heavy mineral concentrates from the Odra and Słupsk Banks as well as in the beach sand sample from the Hel Peninsula. The highest concentrations are achieved mainly by cerium and almost two times less by lanthanum. The total REE in the most interesting considered samples range from c.a. 0.14% (trench on the beach) to 0.9% (heavy minerals concentrate from the Odra Bank). The high contents of REE are accompanied by a high concentration of Th (900-150 ppm). Neodymium (0.1-0.17% Nd), whose presence is associated with the presence of pyrochlore and Nb-rutile also appears in the heavy minerals concentrate samples. It is necessary to systematically identify heavy minerals resources in the Baltic sands. More detailed research should cover the prospective areas situated to the North-East from the documented placer fields of the Odra Bank, as well as tentatively identified areas of the Słupsk Bank and submarine paleo-slope of the Hel Peninsula.

scholarly journals The Eneolithic Burial of Maksimovka I Soil Burial Ground from the Samara Trans-Volga Region

2019 ◽  
pp. 6-16
Author(s):  
Victor Tsibin ◽  
Anton Shalapinin
Keyword(s):  
Bronze Age ◽  
Volga Region ◽  
Burial Ground ◽  
Radiocarbon Dates ◽  
Soil Burial ◽  
North East ◽  
The North ◽  
New Information ◽  
Wide Range ◽  
Burial Grounds

Introduction. In the early 1980s the materials of soil burial grounds served as a base for identifying a special Eneolithic period in the history of the Middle and Lower Volga regions. Gathering of source basis on burial Eneolithic complexes is being effected rather slowly. Due to this fact the publication of new information on burial complexes of the Copper Age is quite urgent. This article enters the materials found during the excavations on Maksimovka I soil burial ground situated within the Samara river basin into scientific life. Methods. The collective burial on Maksimovka I burial ground consisted of three or probably four skeletons. They were supine, their legs bent at the knees and their heads oriented towards the North-East. Grave goods included a bone tool, a pressure tool, a sandstone pendant, flint scrapers and a borer, arrowheads with straight or emarginated foundation. Results. While comparing the burial rite with materials of other Eneolithic burial grounds one can see the greatest similarity in the complexes of the Khvalynsk Eneolithic culture (the presence of collective burials, supine position of skeletons with bent legs, orienting the buried people’s heads towards the North-East). Leaf-like arrowheads with narrowed bases and a cavity on the foundation were used in a wide range of activities in the Eneolithic period and Early Bronze Age in the Volga-Don interfluve. However they are typical for Caspian and Altatin complexes in the steppe area of the Volga region. Discussion. In accordance with the latest radiocarbon dates concerning the Eneolithic materials of soil burial grounds and settlement monuments one should date the burial on Maksimovka soil burial ground tentatively 5200–4500 BC.

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