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Articles by Serdar Bektas
Total Records ( 3 ) for Serdar Bektas
  Serdar Bektas , Ozer Ayik and Telat Yanik
  In vitro susceptibilities of 30 Aeromonas salmonicida strains isolated from rainbow trout (Oncorhynchus mykiss) were determined against to 23 antimicrobials by using disc diffusion method. According to antimicrobial susceptibility tests results, A. salmonicida strains were found susceptible to all antibiotics tested except for the ampicilin and vancomycine. The major fatty acids, used as indicators for identification of the bacteria, were found as 14:0 3OH/16:1 ISO I, 16:1 w7c/15 ISO 2OH, 16:0 and 18:1 w7c, respectively.
  Zehra Arzu Becer Ozvarol , Ayhan Yildirim , Serdar Bektas , Yasar Ozvarol and Serpil Yilmaz
  Growth and condition were analysed for brown trout from the streams from Coruh Basin, Norteastrean Turkey from summer to Fall in 2008. There were slightly variability both length and weight for brown trout among the streams. The highest instantenous Growth rate for Length (GFL) and total weight (GW) occured between 0 and 1 age for all streams with highest values in Kocun Bogazi stream. The lowest condition coefficient (K) for brown trout was observed in Cenker stream with mean value of 1.16 whereas the highest value was recorded in Yagli stream with mean value of 1.24 and there was statistical differences among the streams with analyses of one-way ANOVA (p<0.05). Also, length-weight relationship was calculated for brown trout from streams. It varied 3.008-3.166. Fishes in streams of Cenker and Mulk displayed isometric growth whereas those in other streams had positive allometric growth characteristic. Von Bertalanffy equation also was calculated to analyse growth in length for brown trout. Variability in growth and nutrition for brown trout among the stream might be attributed to physical envirionmental variables.
  Serdar Bektas and Ozer Ayik
  Erythrocyte osmotic fragility and erythrocyte membrane fatty acid profiles of Rainbow trout (Oncorhynchus mykiss) experimentally infected with Aeromonas salmonicida were investigated at different days of injection. Erythrocytes of the infected fish were found more fragile than the controls. While 50% of haemolysis of diseased fish erythrocytes occurred at chloride concentration of 0.49±0.01%, it was 0.40±0.01% for controls. Three remarkable trends in erythrocyte fatty acid patterns in infected fish observed when compared with the controls. While no significant differences in saturated fatty acids were detected significant decrease in monounsaturated acids and increase in polyunsaturated fatty acids were also detected.
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