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Articles by Kaya GOKCEK
Total Records ( 3 ) for Kaya GOKCEK
  Kaya Gokcek
  Himri Barbel fry, Carasobarbus luteus (Heckel in 1843) were introduced to tilapia duoculture in net cages. Five treatment groups were designed according to different stocking proportions of tilapia and himri and each treatment were triplicated. The study was carried out for 60 days by using 500 L net cages and fish were fed 2 times a day by commercial carp diet. Five stocking treatments were as follow: S1 (100% tilapia), S2 (75% tilapia+25% himri barbel), S3 (50% tilapia+50% himri barbel), S4 (25% tilapia+75% himri barbel) and S5 (100% himri barbel). Polyculturing with tilapia had no adverse effects on himri stocks however total biomass at harvest and feed conversion ratio were negatively affected with increasing himri in tilapia stocks.
  Kaya Gokcek and Fatih Ogretmen
  In this study, the efficacy of three anaesthetic agents (Clove oil, 2-phenoxyethanol and benzocaine) was compared in captive-bred Himri barbel, Carasobarbus luteus (Heckel, 1843). The lowest effective concentrations based on the efficacy criteria of complete anesthesia induction within 180 sec and recovery within 300 sec were determined to be 75 mg L-1 (induction 143±15 sec and recovery time 149±35 sec) for clove oil, 500 μL L-1 (induction 145±27 sec and recovery time 57±16 sec) for 2-phenooxyethanol and 50 mg L-1 (induction 152±49 sec and recovery time 88±24 sec) for benzocaine. The onset of individual phases of anesthesia and recovery times depended significantly on the concentration of the anaesthetic used (p<0.05). An inverse exponential relationship was observed between concentrations of anaesthetic and induction time whereas exponential relationships were observed between concentrations and recovery times for all anaesthetic agents evaluated.
  Kaya GOKCEK and Yalcın TEPE
  Two stocking densities (20 and 40 fry/80-l tank) with 4 feeding rates (2.5%, 5.0%, 7.5%, and 10.0% body weight/day) were used to determine the optimum feeding level for himri barbel fry during a 60-day culture period. Water quality parameters (temperature, dissolved oxygen, pH, and total ammonia nitrogen) were monitored during the experiment. Final body weight and specific growth rate (SGR) was significantly lower with the 2.5% feeding rate than with the others, at both stocking densities; however, no significant differences were observed between the other feeding rates and between stocking densities. The best feed conversion ratio (FCR) of 1.37 was achieved with the 2.5% feeding rate and stocking density of 40 fry/80 l; yet, in terms of total yield and survival the optimal FCR of 1.50 was obtained with the 5.0% feeding rate and 40 fry/80 l. At the 10.0% feeding rate survival rates were significantly lower. Both feeding ratio and stocking density also affected water quality parameters.
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