Population parameters of whiting (Merlangius merlangus euxinus L., 1758) in the South-Eastern Black Sea

Karadenizin Türkiye kıyılarında yayılış gösteren mezgit stoklarının bazı popülasyon parametrelerini tespit etmek amacıyla yürütülen bu araştırmada, toplam 1884 adet balığın yaş, boy, ağırlık, cinsiyet kompozisyonları, boy-ağırlık ilişkisi, kondisyon faktörü, Von Bertalanffy büyüme denklemi ve ölüm oranları incelenmiştir. Boyca ortalama yıllık büyüme oranı 2,4 cm olarak bulunmuştur. Dişiler için maksimum yaş 5, erkekler için 4 olarak bulunmuştur. Ortalama boy ve ağırlık dişi bireyler için 15,10±0,05 cm, 25,74±0,278 g, erkek bireyler için 14,50±0,06 cm, 22,60±0,274 g ve tüm bireyler için 14,85±0,04 cm, 24.42±0.201 g olarak belirlenmiştir. Genel olarak dişiler erkeklerden daha büyük boy ve ağırlık değerine sahiptir. Boy-ağırlık ilişkisi dişi ve erkelerde benzerlik göstermektedir. Genel olarak populasyonda boy ağırlık ilişkisi W = 0.0064 L3.0441 olarak hesaplanmıştır. Von Bertalanffy büyüme denklemi dişi bireyler için Lt=38,16 (1-e-0,124(t+2,583)), erkek bireyler için Lt=26,26 (1- e-0,203(t+2,505)) ve tüm bireyler için Lt=33,56 (1-e-0,141(t+2,654)) olarak hesaplanmıştır. Anlık toplam ölüm katsayısı Z=1,68 yıl-1, doğal ölüm katsayısı M=0,27 yıl-1, avlanma ölüm katsayısı F=1,41 yıl-1 ve işletme oranı E=0,84 yıl-1 olarak bulunmuştur.

Güneydoğu karadeniz mezgit balığının (Merlangius merlangus euxinus L., 1758) popülasyon parametreleri

Whiting (Merlangius merlangus euxinus L., 1758) is one of the most commonly distributed species in the entire Black Sea coastal waters of Turkey. Population parameters of whiting were studied using 1884 specimens obtained off the coasts of Sinop, Samsun, Giresun and Ordu provinces (Turkey) in 2009-2010. Average annual length and weight increment was 2.41 cm (17.45%) and 14.99 g (75.47%), respectively. Maximum ages were determined as 5 yrs for females and 4 yrs for males. Mean lengths and weights for male and females were calculated as 14.5±0.06 cm; 22.60±0.274 g and 15.1±0.05 cm; 25.74±0.278 g, respectively. Average length and weight for both sexes were calculated as 14.9±0.04 cm and 24.42±0.201 g. Although females were observed as bigger in size in comparison to males, there was no gender dependent statistical difference in length-weight relationship in which W=0.0064 L3.0441 represents the whole population. Von Bertalanffy growth equation was derived as Lt=38.16 (1-e-0,124(t+2,583)) for females, Lt=26.26 (1-e-0.203(t+2,505)) for males and Lt=33.56 (1-e-0,141(t+2,654)) for both sexes. Instantaneous total mortality, natural mortality and fishing mortality rates were calculated as Z=1.68 yr-1, M=0.27 yr-1, and F=1.41 yr-1. Exploitation rate was E=0.84 yr-1.

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