CULTIVATION OF THE PACIFIC MUSSEL MYTILUS TROSSULUS (BIVALVIA: MYTILIDAE) IN MONO-AND POLYCULTURE IN THE NORTHERN PART OF THE SEA OF OKHOTSK

Fisheries ◽  
2020 ◽  
Vol 2020 (6) ◽  
pp. 108-110
Author(s):  
Viacheslav Zharnikov ◽  
Andrey Smirnov
Keyword(s):  
Growth Rate ◽  
Sea Of Okhotsk ◽  
Age Groups ◽  
Maximum Growth ◽  
Size Group ◽  
Mytilus Trossulus ◽  
The Sea Of Okhotsk ◽  
The Pacific ◽  
Size Groups ◽  
Mussel Mytilus Trossulus

The growth of various size groups of mussels in the Veselaya Bay of the tauyskaya Bay, grown in mono - and polyculture in suspended cages in the sea, was analyzed. The maximum growth was observed in mussels of the size group 10-20 mm at the age of 2 years. Shellfish grew more slowly at the age of 3-5 years. The growth rate of mollusks of all size groups in the polyculture was higher than in the monoculture. The percentage of elimination of mussels of all age groups in the polyculture was significantly lower. The forecast of growth of mussels of various size groups in poly - and monoculture in suspended cages in the first, second and third growth seasons in Veselaya Bay is made. The efficiency of cultivation of mussels in the Northern part of the sea of Okhotsk together with other edible mollusks: makoma and Miya is shown.

scholarly journals High genetic diversity of bivalve transmissible neoplasia in the blue mussel Mytilus trossulus Gould from the subarctic Sea of Okhotsk

2021 ◽  
Author(s):  
Maria Skazina ◽  
Nelly Odintsova ◽  
Mariia A. Maiorova ◽  
Lidia Frolova ◽  
Irina Dolganova ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Sea Of Okhotsk ◽  
Blue Mussel ◽  
Mytilus Trossulus ◽  
High Genetic Diversity ◽  
Histological Techniques ◽  
Mtdna Coi ◽  
The Pacific ◽  
Mussel Mytilus Trossulus ◽  
Evolutionary Lineages

There are increasing findings of the bivalve transmissible neoplasia derived from the Pacific mussel Mytilus trossulus (MtrBTN) in populations of different Mytilus species worldwide. The Subarctic is an area where this disease has not yet been sought despite the fact that Mytilus spp. are widespread there, and M. trossulus itself is a boreal species. We used cytological and histological techniques to diagnose disseminated neoplasia in a sample of M. trossulus from Magadan in the subarctic Sea of Okhotsk. Neoplasia was identified in 11 of 214 mussels studied. Using mtDNA COI sequencing, we revealed genotypes identical or nearly identical to known MtrBTN ones in the hemolymph of most of the diseased mussels. Both MtrBTN evolutionary lineages have been identified, the widespread MtrBTN2, and MtrBTN1, so far only known from M. trossulus in British Columbia on the other side of the Pacific from Magadan. In addition, MtrBTN2 was represented by two common diverged mtDNA haplolineages. These conclusions have been confirmed for selected cancerous mussels by molecular cloning of COI and additional nuclear and mtDNA genes. On the background of high genetic diversity, different cancers were similar in terms of ploidy (range 4.0 - 5.8n) and nuclear to cell ratio. Our study provides the first description of neoplasia and MtrBTN in mussels from the Sea of Okhotsk and from the Subarctic, of both MtrBTN1 and MtrBTN2 in the same mussel population, and the first direct comparison between these transmissible cancers.

scholarly journals Study on the growth rates of mollusks in hanging culture in Possjet Bay (Sea of Japan)

2020 ◽  
Vol 24 (1/2) ◽  
pp. 67-81
Author(s):  
Nina I. Grigoryeva
Keyword(s):  
Growth Rate ◽  
Sea Of Japan ◽  
Growth Rates ◽  
Crassostrea Gigas ◽  
Blue Mussel ◽  
Peter The Great Bay ◽  
Mytilus Trossulus ◽  
Mizuhopecten Yessoensis ◽  
Yesso Scallop ◽  
Mussel Mytilus Trossulus

Исследована скорость роста культивируемых моллюсков подвесного выращивания в зал. Посьета (зал. Петра Великого, Японское море) за 1970–2011 гг. Приведены ростовые характеристики приморского гребешка (Mizuhopecten yessoensis (Jay, 1857)), тихоокеанской мидии (Mytilus trossulus Gould, 1850) и тихоокеанской (гигантской) устрицы (Crassostrea gigas (Thunberg, 1793)) в течение первых трех лет развития. Методами энтропийного анализа исследованы сроки достижения личинками и спатом определенных размеров. Выявлены временные интервалы и рассчитана вероятность наступления этих сроков. Обсуждается влияние техники культивирования на скорость роста. Ключевые слова: скорость роста, личинки, спат, приморский гребешок Mizuhopecten yessoensis, тихоокеанская мидия Mytilus trossulus, тихоокеанская устрица Crassostrea gigas, залив Посьета, Японское море. The growth rates of cultivated mollusks were studied in Possjet Bay (Peter the Great Bay, Sea of Japan) during 1970–2011. The growth characteristics were presented for the Yesso scallop (Mizuhopecten yessoensis (Jay, 1857)), the blue mussel (Mytilus trossulus Gould, 1850), and the Pacific (giant) oyster (Crassostrea gigas (Thunberg, 1793)) during the first three years of life. The average amount of time of the larvae and spat reaching certain sizes was determined using the method of entropy analysis. The time intervals were identified and the probability of these intervals to happen were also calculated. The influence of the cultivation techniques on the growth rate is discussed. Key words: growth rate, larvae, spat, Yesso scallop Mizuhopecten yessoensis, blue mussel Mytilus trossulus, Pacific oyster Crassostrea gigas, Possjet Bay, Sea of Japan.

scholarly journals Prevalence of Epstein–Barr virus antibodies in different age groups in Europe and Asia: a systematic review and meta-analysis

2021 ◽  
Vol 65 (3) ◽  
pp. 276-286
Author(s):  
Tatyana V. Solomay ◽  
Tatyana A. Semenenko ◽  
Alexey I. Blokh
Keyword(s):  
Systematic Review ◽  
Growth Rate ◽  
Epstein Barr Virus ◽  
Meta Analysis ◽  
Age Groups ◽  
Maximum Growth ◽  
Small Samples ◽  
Barr Virus ◽  
Cochrane Reviews ◽  
Epstein Barr

Introduction. Attempts to assess the prevalence of antibodies (seroprevalence) to the Epstein-Barr virus have been made several times. Still, a complete understanding of this issue has not been reached due to the small samples of the surveyed. The goal is to evaluate seroprevalence in different age groups in Europe and Asia using a systematic review and meta-analysis. Material and methods. The search for publications was carried out on PubMed, Cochrane Reviews/CochraneLibrary, eLibrary, Cyberleninka, Researchgate from May 6 to 30, 2020. A total of 2,364 articles were found, 12 of which were included in the study. Seroprevalence to Epstein-Barr virus was determined in 67,561 individuals aged 0 to 80 years. The research results were distributed by age groups, continents (Europe and Asia), and their implementation (2000-2012 and 2013-2019) and subjected to meta-analysis. Results. Minimal seroprevalence was detected among children under 1 and 1-2 years of age (53.3 and 50.9%). With increasing age, it grew, and people over 18 years of age were more than 90%. In 2013-2019, the index value (68.9%) was significantly higher than in 2000-2012 (89.6%). In Asian countries in 2000-2019, seroprevalence (86.7%) was considerably higher than in Europe (76.3%). The highest growth rate was observed in 7-14 years. In 2000-2012, the maximum growth rate of seroprevalence occurred in 15-17 years and 2013-2019 - 3-6 years. For all age groups, the growth rate was higher in Europe than in Asia and 2013-2019 compared to 2000-2012. Conclusion. The meta-analysis revealed differences in seroprevalence depending on age and territory of residence and the growth of indices in the trend.

Evaluation of reproduction for mussel Mytilus trossulus (Bivalvia: Mytilidae) in the Veselaya Bay (Tauiskaya Guba Bay, Okhotsk Sea)

2018 ◽  
Vol 194 ◽  
pp. 175-187 ◽  
Author(s):  
V. S. Zharnikov
Keyword(s):  
Growth Rate ◽  
Shell Length ◽  
Size Composition ◽  
High Water ◽  
Mytilus Trossulus ◽  
Okhotsk Sea ◽  
High Water Temperature ◽  
Spat Collection ◽  
Mussel Mytilus Trossulus ◽  
Larvae Density

Abundance, size composition, and terms of plankton stage were investigated for the larvae of pacific mussel in the Veselaya Bay (Okhotsk Sea) in two years with different oceanographic regime. The first larvae (density 8-30 ind./m³, shell length 75–150 μm) appeared in late June in the year with relatively high water temperature (2016) and in early July in the year with lowered temperature (2011), then their number had increased to 1750 ind./m³ in early August of 2016 and to 1320 ind./m³ in late August of 2011. Density and size composition of the spat and young mussels were examined in hanging collectors and nurseries. The growth rate change in dependence on shell length was noted. There is concluded that the hanging collectors are more effective for spat collection, while the nurseries are better for growing of littoral mussels.  

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