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Turkish Journal of Fisheries and Aquatic Sciences 2013, Vol 13, Num, 2     (Pages: 221-231)

Population Dynamics and Stock Assessment of Capoeta umbla (Heckel, 1843) in Lake Hazar, Elazığ, Turkey

Mehmet Zülfü Çoban 1 ,Fatih Gündüz 2 ,Ferhat Demirol 2 ,Gürel Nedim Örnekçi 2 ,Gökhan Karakaya 2 ,İbrahim Türkgülü 3 ,Ahmet Alp 4

1 Fırat University, Fisheries Faculty, 23119, Elazığ, Turkey
2 Elazığ Fisheries Research Institute, 23100, Elazığ, Turkey
3 Ministry of Food, Agriculture and Livestock District Directorate, 10300, Edremit-Balıkesir, Turkey
4 University of Kahramanmaraş Sütçü Imam, Faculty of Agriculture, Department of Fisheries, Kahramanmaraş, Turkey
DOI : 10.4194/1303-2712-v13_2_04 Viewed : 2151 - Downloaded : 1759 Population parameters such as growth, mortality rates, annual catch and stock size of Capoeta umbla (Heckel, 1843) population in Lake Hazar were investigated. Length and weight relationships of the population was W= 0.070xTL2.39 (n= 364; R2 = 0.95) and von Bertalanffy Growth Parameters were estimated as L∞= 53.77 cm; K=0.16; t0=-1.84 and W∞=957.38 g. Natural mortality rate (M) was 0.363 while fishing mortality (F) and total mortality rate (Z) were 0.349 and 0.712, respectively. Annual catch was 25721 kg (107544 individuals) and mean fish size was 28.7 cm (239.4 g). Estimated stock size based on mark and recapture method was 91601 kg (CI(95%): 85163-99061 kg) and 382627 individuals (CI(95%): 355736- 413916 individuals). Stock size was also assessed by using length-based cohort analysis and was found to be 95256 kg (CI(95%):55079-263225 kg) and 358105 individuals (CI(95%): 240251-868729 individuals). According to yield-biomass relationships, estimated maximum sustainable yield (MSY) was 27070 kg. Keywords : Lake Hazar, Capoeta umbla, growth parameters, mortality rates, stock assessment