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Articles by Hasan Koyun
Total Records ( 2 ) for Hasan Koyun
  Hasan Koyun , Hayrettin Okut and Seyrani Koncagül
  The aim of the present study was to conduct a genome-wide screening for QTL (Quantitative Trait Loci) detection using the simulated phenotype and genotype data sets obtained from the QTL-MAS workshop 12. A genome scan was carried out in 45 half-sib families to identify QTL influencing a hypothetical trait. Among six chromosomes, each chromosome with 1000 SNP loci, 11 informative markers at least 2 cM apart from one another were chosen based on PICs with highest χ2-statistic. Half-sib data were pooled and used simultaneously in the analyses conducted for each chromosome separately. Data were analyzed by generating an F-statistic every 1 cM on a linkage map by regression of phenotypes on the probabilities of inheriting an allele from the sire. Permutation tests at chromosome-wide significance thresholds were carried out over 1000 iterations. Among six chromosomes, significant putative QTL were detected on chromosome 1 (27 cM), 2 (36 cM), 3 (18 cM), 4 (0 cM) and 5 (96 cM) across the families (α = 0.01 and α = 0.05). There was no QTL detected, exceeding chromosome-wide significance level of p<0.05 and p<0.01 on chromosome 6.
  Muhammed Arabaci , Yasin Yilmaz , Saltuk Bugrahan Ceyhun , Orhan Erdogan , Hakan Galip Dorlay , Ibrahim Diler , Suleyman Akhan , Mehmet Kocabas , Kerem Ozdemir , Hasan Koyun and Seyrani Koncagul
  S. aurata is a marine fish living along the Atlantic coasts of Europe and the Mediterranean Sea. It is an important food species, so that its production reached 128,943 t in the European aquaculture in 2008. However, little is known on its biology, in particular the efective and census sizes, distribution, spawning grounds and behaviour. Also the species subdivision still needs to be clarified. In this review, studies related with gilthead sea bream populations and problems with the clarification of gilthead seabream population structure in hatchery and wild were reviewed. Also, it was intensified on potential research areas, having importance in determination of population structure of gilthead seabream such as morphology and behaviour in hatchery and wild. Determination of the genetic structure of S. aurata populations based on behaviour and morphology will not only contribute greatly to biological clarification of the species but also will help the development strategy for conservation of natural stocks (e.g., protecting the stopover points) and the determination of reference stocks, which is important for the culture of gilthead seabream to use in the genetic improvement programmes.
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