scholarly journals Determination of Some Biological Characteristics and Population Parameters of the Blotched Picarel (Spicara flexuosa Rafinesque, 1810) Distributed in the Eastern Black Sea (Rize - Hopa)

2020 ◽  
Author(s):  
İ̇̇brahim Oğuz ERGÜN ◽  
Göktuğ DALGIÇ ◽  
Hatice ONAY
Keyword(s):  
Black Sea ◽  
Biological Characteristics ◽  
Population Parameters

Determination of some population parameters of the veined rapa whelk (Rapana venosa) in the Central Black Sea

2014 ◽  
Vol 95 (1) ◽  
pp. 123-129
Author(s):  
Naciye Erdoğan Sağlam ◽  
Cemil Sağlam ◽  
Yeşim Demir Sağlam
Keyword(s):  
Black Sea ◽  
Growth Parameters ◽  
The Black Sea ◽  
Population Parameters ◽  
Length Frequency ◽  
Alternative Product ◽  
Mediterranean Mussel ◽  
Length Frequency Data ◽  
Rapa Whelk

The veined rapa whelk is one of the most important invasive species in the Black Sea ecosystem since the 1940s. Following its introduction to the Black Sea, it destroyed most of the bivalve populations, mainly the Mediterranean mussel and oysters. However, the veined rapa whelk has commercial importance for the Black Sea fisheries as an alternative product. In this study, we aimed to determine some population parameters of the veined rapa whelk based on indirect ageing through length–frequency data by using the Bhattacharya method. We collected 1704 specimens by dredging along the coasts of Samsun Province in the Central Black Sea in 2011 from June to November. The age of the population varied from 0 to 6. Von Bertalanffy growth parameters were estimated as L∞ = 112.35 mm, k = 0.310, t0 = −0.486 and W∞ = 243.94 g. Mean length and weight, length–weight relationship, mortality and exploitation rates were derived as L = 56.80 ± 0.36 mm, W = 45.67 ± 0.89 g, W = 0.0006 L2.719, Z = 0.96, M = 0.57, F = 0.39 and E = 0.40, respectively.

THE MEASUREMENT AND ANALYSIS OF TRIPLE CORRELATIONS

1964 ◽  
Vol 42 (6) ◽  
pp. 1101-1115 ◽  
Author(s):  
Philip B. Smith
Keyword(s):  
Gamma Rays ◽  
Heavy Particle ◽  
Original Data ◽  
Population Parameters ◽  
True Solution ◽  
Error Matrix ◽  
Mixing Ratios ◽  
Triple Correlation ◽  
Measurement And Analysis

The measurement and analysis of the intensity–direction correlation of gamma rays emitted in cascade following heavy-particle capture are treated. A procedure is discussed which is based upon the expansion of the triple-correlation intensity in terms of the set of angular functions orthogonal over the space of the emission (or absorption) directions. This is in contrast to the usual method which expresses the correlation in terms of Legendre polynomials. In the analysis procedure proposed, the population parameters are found directly from the original data, with the gamma-radiation mixing ratios assigned. The least-squares equations representing the best fit to the data contain the population parameters linearly and are solved by a standard computer program which also gives the value of χ2. The true solution is then found by varying the mixing ratios until a minimum in χ2 is reached. In addition to the determination of the population parameters of the decaying state and the mixing ratios of the gamma rays in the cascade, the calculation of the error matrix of these quantities, and the calculation of the formation parameters in simple capture, are described.

Parentage determination of black sea bream (Acanthopagrus schlegelii) for stock enhancement: effectiveness and loss of genetic variation

2021 ◽  
Vol 40 (6) ◽  
pp. 41-49
Author(s):  
Binbin Shan ◽  
Yan Liu ◽  
Na Song ◽  
Changping Yang ◽  
Shengnan Liu ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Black Sea ◽  
Stock Enhancement ◽  
Sea Bream ◽  
Acanthopagrus Schlegelii

scholarly journals Population parameters of the pontic shad, Alosa immaculata Bennett, 1835 in the Fatsa coast of the south-eastern Black Sea

2019 ◽  
Vol 36 (4) ◽  
pp. 319-324
Author(s):  
İsmet Balık
Keyword(s):  
Black Sea ◽  
Maximum Yield ◽  
Total Mortality ◽  
Reference Points ◽  
Growth Equation ◽  
Fishing Mortality ◽  
Population Parameters ◽  
The South ◽  
South Eastern ◽  
Exploitation Rate

The aim of this study is to estimate population parameters of pontic shad, Alosa immaculata Bennett, 1835 in the Fatsa coast of the south-eastern Black Sea. A total of 314 pontic shad specimens were collected from study area using artisanal fishing gears from March 2013 to February 2014. In the study, parameters of the von Bertalanffy growth equation were found as L∞=43.05 cm; k=0.430 per year and t0=-0.451 year. The growth performance index (Φ') was estimated as 2.90. The total mortality (Z), natural mortality (M), fishing mortality rates (F) were calculated as 1.33 year-1, 0.75 year-1 and 0.58 year-1, respectively. The annual instantaneous fishing mortality rate was greater than both the target (Fopt=0.375 year-1) and limit (Flimit=0.50 year-1) biological reference points. Similarly, the present level of exploitation rate (E=0.43) was higher than the exploitation ratio for maximum yield per recruit (Emax=0.375) suggesting that overexploitation occurred. These results showed that this species has been over-exploited in the Fatsa coast of the south-eastern Black Sea. Measures should be taken to reduce the current exploitation rate for sustainable fishing of pontic shad in the Fatsa coast of the south-eastern Black Sea.

scholarly journals Determination of regional screening criteria for retinopathy ofprematurity in the Eastern Black Sea region of Turkey

2016 ◽  
Vol 46 ◽  
pp. 381-387 ◽  
Author(s):  
Mehmet KOLA ◽  
Dilek HACIOĞLU ◽  
Hidayet ERDÖL ◽  
Adem TÜRK ◽  
Yakup ASLAN
Keyword(s):  
Black Sea ◽  
Screening Criteria ◽  
Black Sea Region

scholarly journals About the soil-climatic border of South and Dry Steppe on the NorthWestern Black Sea

2010 ◽  
pp. 214-220
Author(s):  
G. Moroz
Keyword(s):  
Key Words ◽  
Black Sea ◽  
Chestnut Soils ◽  
Dry Steppe

The analyses of approaches as to determination of limit of South and Dry Steppe in different zoning are conducted. It was set the limit between darkly chestnut soils and south chernozems on the NorthWestern Black Sea; the variants of differentiating of South and Dry Steppe are offered. Key words: zoning, Steppe, south chernozems, darkly chestnut soils.

scholarly journals Determination of promising high yielded mungbean (Vigna radiata (L.) Wilczek) genotypes under Middle Black Sea Region of Turkey

2015 ◽  
Vol 30 (2) ◽  
pp. 169
Author(s):  
Erkut Pekşen ◽  
Cengiz Toker ◽  
Funda Öncü Ceylan ◽  
Tariq Aziz ◽  
Muhammad Farooq
Keyword(s):  
Black Sea ◽  
Vigna Radiata ◽  
Black Sea Region
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