Population dynamics and stock assessment of Capoeta umbla (Heckel, 1843) in Lake Hazar, Elazığ, Turkey

Elazığ Hazar Gölü’ndeki Capoeta umbla (Heckel, 1843) populasyonunun av miktarları, boy frekansları, büyüme parametreleri ve ölüm oranları gibi populasyon parametreleri ve stok büyüklüğü incelendi. Populasyona ait boy ağırlık ilişkisi W= 0.070xTL2,39 (n= 364; R2 = 0.95) ve von Bertalanffy büyüme parametreleri ise; L∞=53.77 cm; K=0.16; t0=-1.84 ve W∞=957.38 g olarak hesaplandı. C. umbla populasyonunda doğal ölüm oranı M=0.363; balıkçılık ölüm oranı F=0.349 ve total ölüm oranı Z=0.712 olarak bulundu. Yıllık avlanan ürün miktarı 25721 kg (107544 adet) olup avlanan balıkların ortalama büyüklüğü 28.7 cm (239.4 g) olarak hesaplandı. Markalama yöntemine göre stok büyüklüğü bioymas olarak 91601 kg (CI(%95): 85163-99091 kg) ve sayısal olarak ise 382627 adet (CI(%95): 355736-413916 adet) olarak hesaplandı. Boya dayalı cohort analizine göre ise ortalama biyomas 95256 kg (CI(%95): 55079-263225 kg) ve sayısal olarak ise 358105 adet (CI(%95): 240251-868729 adet) olarak tahmin edildi. Ürün-Biyomas ilişkisine göre sürdürülebilir maksimum ürün (MSY) 27070 kg olarak hesaplandı.

Elazığ Hazar Gölü'nde Yaşayan Capoeta umbla (Heckel, 1843)'nın stok tahmini ve populasyon dinamiği

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 2.39 (n= 364; R2 = 0.95) and von Bertalanffy Growth Parameters were estimated as L∞= 53.77 cm; K=0.16; t 0=-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.

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Turkish Journal of Fisheries and Aquatic Sciences-Cover
  • ISSN: 1303-2712
  • Başlangıç: 2015
  • Yayıncı: Su Ürünleri Merkez Araştırma Enstitüsü - Trabzon
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