The second stage of development of artificial reproduction technology of northern pike in the Kaliningrad lagoon basin

2021 ◽  
pp. 42-54
Author(s):  
Dmitrij Gennad’evich Lopuhin ◽  
Evgeny Ivanovich Khrustalev ◽  
Ksenia Andreevna Molchanova ◽  
Pavel Petrovich Zhdanov
Keyword(s):  
Northern Pike ◽  
Curonian Lagoon ◽  
High Survival ◽  
Artificial Reproduction ◽  
Spawning Habitat ◽  
Second Stage ◽  
Stage Of Development ◽  
Kaliningrad Region ◽  
The Baltic ◽  
Baltic Sea Basin

The second stage of development of northern pike artificial reproduction technology for stocking with larvae and fry in the Kaliningrad lagoon basin is considered in this paper. Today northern pike natural stocks in the Kaliningrad lagoon basin are not numerous due to unregulated fishery and limited spawning habitat. Since the 1990s, in many countries of the world, the number of natural stocking northern pike has gradually decreased and at present does not exceed several thousand tons. This problem is also relevant for the Baltic Sea basin, where the modern catches of northern pike in the Curonian and Kaliningrad lagoons make 7,2 and 0,6 tons respectively. At the present time different scientific programs and actions are realized in many countries to restore natural stocks of northern pike. One of the most promising solutions of low northern pike numbers problem is organization of northern pike artificial reproduction in the territory of the Kaliningrad Region. Based on our earlier research in the Curonian lagoon basin, the second stage of development of the technology of northern pike artificial reproduction was carried out on the basis of the educational and experimental farm of KSTU in 2020. Prespawning maintenance of 25 northern pike producers with the use of cages from deli, ponds and reclamation canal was carried out, as well as egg incubation and holding of prelarvae in RAS. As a result of the conducted researches, it was established, that the reproductive products of northern pike producers have high quality and the prelarvae at the stage of incubation have high survival rate (82,2–91,7%). The calculated of biometric parameters of producers and their reproductive products, confirmed the correlation between the weight of females and their fecundity, which was 0,86 and 0,95. The scheme of keeping of producers and incubation of northern pike eggs tested at the second stage has shown the prospect of providing 50% of the need in stocking of young northern pike in the Kaliningrad lagoon with the use of 100% stock of producers.

Self-purification process and retention of nitrogen in floodplains of River Nemunas

2010 ◽  
Vol 41 (3-4) ◽  
pp. 338-345 ◽  
Author(s):  
Saulius Vaikasas ◽  
Antanas Dumbrauskas
Keyword(s):  
Hot Spot ◽  
Inorganic Nitrogen ◽  
Nitrogen Concentration ◽  
Nitrogen Retention ◽  
Suspended Sediments ◽  
Curonian Lagoon ◽  
Purification Process ◽  
Nitrogen Runoff ◽  
The Baltic ◽  
Baltic Sea Basin

Due to its catchment size and its significant level of agricultural pollution, the Nemunas river basin has been identified as an agricultural hot spot in the Baltic Sea basin. On average, the total annual inorganic nitrogen runoff into the river is 26.9 × 106 kg, which corresponds to a load of 275 kg km−2 yr−1. A submerged floodplain, covering 605 km2 of the River Nemunas lowland, maintains the natural retention threshold for pollutants in the water of the main canal and the outfall at Curonian Lagoon, as well as improving farming conditions in the inundated meadows of the valley. It also increases the sedimentation and nitrogen retention capacities of the Nemunas catchment. It has been estimated that about 40% of the fine suspended sediments can be retained and deposited in the flooded meadows of the delta. Controlled inundation of the floodplains in the Nemunas delta may reduce its runoff nitrogen load by 21 kg km−2 per flood event. As a result, nitrogen concentration decreases by approximately 8–10%, causing a self-purification process in the flooded area. Nitrogen retention is dependent upon the velocities of the flood current and has mostly been observed in zones of stagnating water.

Associations of Sphagnum rubellum Wils. on the bogs of the south-east part of Baltic region

2003 ◽  
pp. 50-61 ◽  
Author(s):  
V. A. Smagin ◽  
M. G. Napreenko
Keyword(s):  
Baltic Sea ◽  
Plant Cover ◽  
Karelian Isthmus ◽  
Baltic Region ◽  
The South ◽  
The Baltic Sea ◽  
Kaliningrad Region ◽  
The Baltic ◽  
Typical Habitat ◽  
New Syntaxa

The paper characterizes the 3 associations comprising plant communities with Sphagnum rubellum in the south-eastern part of the Baltic region. The new syntaxa differ from each other both in their floristic characters and the pronounced affinity to definite regional mire types and particular habitats. The ass. Drosero-Sphagnetum rubelli is typical of the relatively most thorough ranges. It is observed from the Kaliningrad region to the Karelian Isthmus and, according to the published reference, occurs even throughout the whole area around the Baltic Sea. Its most typical habitat is that of margins of mire lakes and pools. The ass. Eriophoro-Sphagnetum rubelli occurs in central plateaus of convex plateau-like bogs, typical of the areas adjacent to the Baltic Sea coast. It occupies extended flat mire ecotopes with the water level 0.2–0.25 m deep. The ass. Empetro-Sphagnetum rubelli is characteristic of the retrogressive complex in the convex bogs of the East-Baltic Province. It is mostly observed along the coast of the Gulf of Finland. Its stands are rather dynamic and unstable in both space and time. The presence of communities comprised by these 3 associations is an important vegetation character of the series of regional mire types. Assuming an association level of the respective syntaxa seems rational for the purposes of adequate reflection of plant cover diversity.

INVESTIGATIONS OF THE BALTIC SEA COASTAL ZONE ABOVE-WATER PART TOPOGRAPHY DYNAMICS BY MEANS OF TERRESTRIAL LASER SCANNER (SVETLOGORSK CITY, KALININGRAD REGION)

2017 ◽  
Author(s):  
Nikolay Lugovoy ◽  
Nikolay Lugovoy ◽  
Askar Ilyasov ◽  
Askar Ilyasov ◽  
Elena Pronina ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Coastal Zone ◽  
Coastal Erosion ◽  
Laser Scanner ◽  
Terrestrial Laser Scanner ◽  
The Baltic Sea ◽  
Coastal Dynamics ◽  
Kaliningrad Region ◽  
The Baltic

The paper describes application of the terrestrial laser scanner for investigation of coastal dynamics of the Svetlogorskaya Bay, Baltic Sea. Methods of investigation and results of surveys repeated over the two consecutive years for quantification of coastal erosion and slope processes within the coastal zone are presented.

Analysis of the rates of development and growth of Brachymystax lenok Savinovi during artificial reproduction by the industrial method

2020 ◽  
pp. 40-49
Author(s):  
S. Assylbekova ◽  
N. Badryzlova ◽  
L. Kushnikova
Keyword(s):  
Water Temperature ◽  
Fish Reproduction ◽  
Optimal Conditions ◽  
Artificial Reproduction ◽  
Fish Products ◽  
Rate Of Development ◽  
Stage Of Development ◽  
East Kazakhstan ◽  
Brachymystax Lenok ◽  
The Moment

The article presents the results of the first research on artificial reproduction in industrial conditions of the endemic, narrow-areal subspecies of Brachymystax lenok Savinovi, which lives in lake Markakol, East Kazakhstan region. The indicators of the heat sum characteristic for each stage of development, the rate of development and growth of the Markakolsky lenok from the moment of pre-breeding to late juveniles are described. To develop technological approaches for artificial fish reproduction, one of the most important points is to determine the optimal conditions for each stage and assess the risks (loss of fish products). At the stage of insemination and transportation of eggs to the place of incubation, the loss was 50 %. The largest losses of fish products were registered during the incubation stage. The most painlessly passed the period of holding and lifting on the float, where the loss was only 3 %. When growing pre-larvae and larvae in the pool, the daily waste did not exceed 1 %. Small-sized animals that were unable to adapt to artificial feeds fell into the waste. Losses during this period amounted to 15 % of the previous stage. In General, the yield of juveniles from the moment of fertilization to the end of the experiment was 16 %. The crucial factor in the development and growth of Lenok Markakolosky is the temperature regime. For the period of embryonic development, the most favorable water temperature is 7–8 °C. From the moment of hatching, the water temperature must be increased to 10–12 °C, and the optimal temperature for the cage growing of fingerlings varies from 12 to 14 °C.

ACCUMULATION OF PLASTIC FRAGMENTS AND MICROPLASTICS ON THE BEACHES IN THE SOUTH-EAST BALTIC SEA

2017 ◽  
Author(s):  
Lilia Khatmullina ◽  
Lilia Khatmullina ◽  
Elena Esiukova ◽  
Elena Esiukova
Keyword(s):  
Baltic Sea ◽  
Size Range ◽  
Anthropogenic Pollution ◽  
The South ◽  
The Baltic Sea ◽  
Quantitative Distribution ◽  
Sediment Sampling ◽  
Beach Sediments ◽  
Kaliningrad Region ◽  
The Baltic

The sediment sampling from different areas of the beaches in the south-eastern part of the Baltic Sea (in Kaliningrad region) was executed for the purpose of studying the quantitative and qualitative composition of the microplastics particles (range 0.5-5 mm). Preference is given to those beaches that are exposed to maximum anthropogenic pollution. From June, 2015 to January, 2016, there were 14 expeditions along the coastline of the Baltic Sea (in Kaliningrad region) to collect experimental materials. The majority of samples were collected on the most recent flotsam deposited at “wracklines”, in the supralittoral zone. The primary examination of those samples revealed the presence of abundant microplastic particles of the required size range (0.5-5 mm). Quantitative distribution of microplastics in beach sediments was obtained in milligrams per gram of sediment and milligrams per m2: on average 0.05-2.89 (mg per gram of sediment) and 370-7330 (mg per m2), accordingly.

scholarly journals Coastal and freshwater pikeperch (Sander lucioperca) populations differ genetically in the Baltic Sea basin

Hereditas ◽  
2010 ◽  
Vol 147 (5) ◽  
pp. 205-214 ◽  
Author(s):  
Marjatta Säisä ◽  
Matti Salminen ◽  
Marja-Liisa Koljonen ◽  
Jukka Ruuhijärvi
Keyword(s):  
Baltic Sea ◽  
Sander Lucioperca ◽  
The Baltic Sea ◽  
The Baltic ◽  
Baltic Sea Basin

Hromatska terminologija u rusinskom i srpskom jeziku

2021 ◽  
Vol 64 (2) ◽  
pp. 309-320
Author(s):  
Mihajlo P. Fejsa
Keyword(s):  
Domestic Animals ◽  
German Language ◽  
Official Language ◽  
Fourth Stage ◽  
Second Stage ◽  
The Third ◽  
Stage Of Development ◽  
Basic Colour ◽  
Third Stage ◽  
Colour Terms

In this paper, the author compares chromatic terms in Ruthenian and Serbian. He focuses on the basic colour terms according to Berlin and Kay: white, black, red, green, yellow, blue, brown, purple, pink, orange, and grey. They have equivalents in both languages: Ruthenian bila – Serbian bela, čarna – crna, červena – crvena, željena – zelena, žovta / žolta – žuta, belava – plava, braon – braon, lilova – ljubičasta, celova – roze, pomarančecova /poma- randžecova – narandžasta, šiva – siva. The criterion of one-morpheme word is not appli- cable to the terms lilova, celova, and pomarančecova /pomarandžecova in Ruthenian, and ljubičasta and narandžasta in Serbian. It is applicable to the terms bila, čarna, červena, željena, žovta / žolta, belava, braon, and šiva. With the exception of braon, all these terms are derived from the Proto-Slavic language (*bеlъ, *čьrnъ, *čьrvenъ, *zelenъ, *žltъ, *polvь, and *sivъ). As far as the Berlin–Kay’s universal of seven phases of colour formation is con- cerned, our study of chromatic terminology confirms it. In accordance with the supposed first stage of development, the Ruthenian language has bila and čarna; according to the second stage, Ruthenian has červena; in accordance with the third stage, Ruthenian has že- ljena or žovta / žolta; according to the fourth stage, Ruthenian has žovta / žolta or željena; in accordance with the fifth stage, Ruthenian has belava; according to the sixth stage, it has braon; and in accordance with the seventh stage (even if we leave aside the multi-mor- pheme terms lilova, celova, and pomarančecova /pomarandžecova), it has šiva. Generally speaking, the usage of the terms is identical in both investigated languages but there are several differences (e.g. cibulja – beli luk, željena pasulja – boranija). The most frequent suffixes are -asta and -ista in Ruthenian, and -asta in Serbian.Most of the chromatic terms are of Slavic origin but there are several borrowings used for nuance purposes in recent decades, e.g. azurna, teget, akvamarin, tirkizna, and others. Some borrowings remain unchanged, e.g. in both languages blond, braon, drap, krem, bež, and oker, and only in Serbian lila and roze. Hungarian was the official language until the first decades of the 20th century (until the collapse of the Austro-Hungarian Monarchy in 1918), during which Ruthenian–Hungarian bilingualism reigned. That is the reason why several Hungarian colour names are found, e.g. in surnames (the Ruthenian surname Barna comes from Hungarian barna ‘brown’, Fekete/Feketa is from fekete ‘black’, and Vereš is from vörös ‘red’) and in the names of domestic animals (the Ruthenian horse name pejka [Serbian riđan] comes from Hungarian pej ‘brown’ and šarga [Serbian žutalj] is from sár- ga ‘yellow’). The general name for ‘colour’ comes from the German language (Ruthenian farba is from German Farbe).

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