Yazarlar

• Alp, A.(1)
• Demirol, F.(1)
• Gündüz, F.(1)
• Pala, Murat(1)
• Yuksel, Fahrettin(1)
• Yüksel, F.(1)
• Çoban, M. Zulfu(1)

• MakaleYalnız künye2014Scopus SJRQ2/r/munzur/4223
  ESTIMATION OF THE POPULATION SIZE OF CAPOETA UMBLA (HECKEL, 1843) IN THE LAKE HAZAR (ELAZIG) BY REMOVAL METHOD

  Yüksel, F.; Alp, A.; Gündüz, F.; Çoban, M. Zulfu; Demirol, F.

  Fish populations in smaller aquatic environments are affected by the fishing pressure at a much faster pace. Often, compensation of this effect either takes a long time or is not possible at all. For the purposes of establishing fishing regulations in these water environments, the removal method is able to provide results quickly and almost accurately. The Lake Hazar, which is the environment of our study, is 8,600 hectares in size, and is a natural lake where Capoeta umbla species is caught commercially using gill nets. In this study, stock size of Capoeta umbla in the Lake Hazar (Elazig) was estimated using removal method. In addition, the power of fishing and the status of fishing yield in the lake were evaluated. In our research, it was determined that seven commercial fishing boats caught 25,721 kg of fish in the lake in a fishing season. CPUE was calculated as 1.55 kg (kg/day/a gill net). As a result of the regression analysis, the amount of stock in the lake was the estimated to be 37,781 kg (+/- 14,001 kg). When cumulative catch was formulated as recommended by Ricker (1975), the population size was estimated to be 38,649 kg (+/- 15,007 kg). As a result of our study, the use of removal method was found to be appropriate for small reservoirs with reduced population density due to strong fishing pressure.

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• MakaleYalnız künye2010Scopus SJRQ3/r/munzur/4288
  Comparison of the Catching Efficiency of Monofilament Gillnets with Different Mesh Size

  Pala, Murat; Yuksel, Fahrettin

  This study was conducted in Keban dam lake Cemisgezek region during 2000-2001 fishing season. In the study, the effect of mesh size on catching efficiency was analyzed. For this reason, a total length of 800 m gillnet was used, particularly two monofilament gillnets with 50, 60, 70 and 90 mm mesh size, each being 100 m long. During the research, Cyprinus carpio and Squalius cephalus was indicated with own species names, which are caught on 22 hunting attempts. Barbus esocinus, Barbus capito pectoralis and Barbus mystaceus species regarded as Barbus sp., Capoeta trutta and Capoeta umbla species regarded as Capoeta sp. The most frequently caught species in the research were Capoeta sp. on 50 and 70 mm mesh sizes, Barbus sp. on 60 mm mesh size and Cyprinus carpi on 90 mm mesh size. The species that is least frequently fished on all gillnets was Squalius cephalus. When the catch per unit effort was analyzed taking into account all species, it was observed that with 83.1 g m(-1) catch per unit effort, 60 mm gillnet was more efficient than all other gillnets. This gillnet was followed by 79.9, 41.0 and 31.8 g m(-1) catch per unit efforts for 50, 70 and 90 mm mesh sizes, respectively. In conclusion, it has been found out that in the study region, gillnets with 50 and 60 mm mesh sizes are more effective than gillnets with 70 and 90 mm mesh sizes.

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