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

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= 0.070xTL super(239) (n= 364; R super(2) = 0.95) and von Bertalanffy Growth Parameters were estimated as L[infinity]= 53.77 cm; K=0.16; t sub(0)=-1.84 and W[infinity]=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 sub((95%)): 85163-99061 kg) and 382627 individuals (CI sub((95%)): 355736-413916 individuals). Stock size was also assessed by using length-based cohort analysis and was found to be 95256 kg (CI sub((95%)):55079-263225 kg) and 358105 individuals (CI sub((95%)): 240251-868729 individuals). According to yield-biomass relationships, estimated maximum sustainable yield (MSY) was 27070 kg.Original Abstract: Elazig Hazar Golu'ndeki Capoeta umbla (Heckel, 1843) populasyonunun av miktarlari, boy frekanslari, buyume parametreleri ve olum oranlari gibi populasyon parametreleri ve stok buyuklugu incelendi. Populasyona ait boy agirlik iliskisi W= 0.070xTL super(2,39) (n= 364; R super(2) = 0.95) ve von Bertalanffy buyume parametreleri ise; L[infinity]=53.77 cm; K=0.16; t sub(0)=-1.84 ve W[infinity]=957.38 g olarak hesaplandi. C. umbla populasyonunda dogal olum orani M=0.363; balikcilik olum orani F=0.349 ve total olum orani Z=0.712 olarak bulundu. Yillik avlanan urun miktari 25721 kg (107544 adet) olup avlanan baliklarin ortalama buyuklugu 28.7 cm (239.4 g) olarak hesaplandi. Markalama yontemine gore stok buyuklugu bioymas olarak 91601 kg (CI sub((%95)): 85163-99091 kg) ve sayisal olarak ise 382627 adet (CI sub((%95)): 355736-413916 adet) olarak hesaplandi. Boya dayali cohort analizine gore ise ortalama biyomas 95256 kg (CI sub((%95)): 55079-263225 kg) ve sayisal olarak ise 358105 adet (CI sub((%95)): 240251-868729 adet) olarak tahmin edildi. Urun-Biyomas iliskisine gore surdurulebilir maksimum urun (MSY) 27070 kg olarak hesaplandi.