Marmara denizi'ndeki bakalyaro (Merluccius merluccius, L. 1758) balığının popülasyon yapısı, dağılımı ve biyoması
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Tarih
2021
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Çanakkale Onsekiz Mart Üniversitesi
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Bu çalışmada, Marmara Denizi'nde Mart 2017-Aralık 2018 tarihleri arasında 23-50 m, 50-100 m ve 100-200 m derinlik konturlarında bakalyaro balığının (Merluccius merluccius, L. 1758) popülasyon parametreleri ve biyomas miktarı belirlenmiştir. Birim av değeri; 2017 yılında 4,25 kg/s, 2018 yılında 4,72 kg/s ve toplam ortalama 4,47 kg/s olarak bulunmuştur. Derinlik konturlarına göre birim av değerleri 50 metre altında 1,32 kg/s, 50-100 metrede 4,99 kg/s ve 100-200 metrede 10 kg/s olarak bulunmuştur. D:E oranı 1:1,49 olarak bulunmuştur. Ortalama boy değeri 2017 yılında 22,49±0,18 cm, 2018 yılında 22,45±0,12 cm ve toplamda 22,47±0,10 cm bulunmuştur. Boy ağırlık ilişkisi denklemleri 2017 yılında W=0,0039×L3,21, 2018 yılında W=0,0048×L3,15 ve toplamda W=0,0041×L3,19 olarak hesaplanmıştır. Bakalyaro balığının üreme zamanı; sonbahar (Eylül-Aralık) ve ilkbahar (Mart) olarak belirlenmiştir. Dişi bireyler için ilk eşeysel olgunluk boyu Lm = 28,44 cm; erkek bireyler için Lm = 25,98 cm olarak tahmin edilmiştir. Popülasyonu oluşturan erkek bireylerin 0 ile 6, dişi bireylerin ise 0 ile 8 yaş grupları arasında dağılım gösterdiği tespit edilmiştir. Doğal ölüm oranı (M) 0,18 yıl-1, toplam ölüm oranı (Z) 1,21 yıl-1, balıkçılık ölümü (F) 1,03 yıl-1, sömürülme oranı (E) 0,85 yıl-1 olarak hesaplanmıştır. Büyüme parametrelerine göre erkek bireyler için (L?) 48,35 cm, (K) 0,26 yıl-1 ve (t0) -0,79 yıl olarak hesaplanmıştır. Dişi bireylerde, (L?) 83,65 cm, (K) 0,13 yıl-1 ve (t0) -0,93 yıl'dır. Toplam bireyler için (L?) 105,00 cm, (K) 0,08 yıl-1 ve (t0) -1,24 yıl olarak hesaplanmıştır.
In this study, population parameters and biomass amount of European hake were determined in the Sea of Marmara. Samples, 23-50 m, 50-100 m and 100-200 m depth contours were obtained between March 2017 and December 2018. The CPUE was determined as 4.25 kg/h in 2017, 4.72 kg/h in 2018 and 4.47 kg/h in total. According to the depth contours, the CPUE were found as 1.32 kg/h under 50 m, 4.99 kg/h at 50-100 m and 10 kg/h at 100-200 m. F:M ratio was found as 1:1.49. The average length was found as 22.49±0.18 cm in 2017, 22.45±0.12 cm in 2018 and 22.47±0.10 cm in total. Length-weight relationship equations were calculated as W=0.0039×L3.21 in 2017, W=0.0048×L3.15 in 2018, and W=0.0041×L3.19 in total. The spawning period of European hake was determined as autumn (September-December) and spring (March). The first sexual maturity length for females and males were estimated as Lm=28.44 cm and Lm=25.98 cm, respectively. The estimated age composition was 0–6 years for males and 0-8 years for females. Natural, fishing and total mortality rate were calculated as M=0.18 y-1, F=1.03 y-1 and Z=1.21 y-1 respectively. Exploitation ratio was estimated as (E)=0.85 y-1. The length at infinity were calculated as (L?)=48.35 cm, growth coefficient was found to be k=0.26 y-1 and to=-0.79 y for males, (L?)=83.65 cm, (K)=0.13 y-1 ve (t0)=-0.93 y for females and (L?)=105.00 cm, (K)=0.08 y-1 ve (t0)=-1.24 y for total.
In this study, population parameters and biomass amount of European hake were determined in the Sea of Marmara. Samples, 23-50 m, 50-100 m and 100-200 m depth contours were obtained between March 2017 and December 2018. The CPUE was determined as 4.25 kg/h in 2017, 4.72 kg/h in 2018 and 4.47 kg/h in total. According to the depth contours, the CPUE were found as 1.32 kg/h under 50 m, 4.99 kg/h at 50-100 m and 10 kg/h at 100-200 m. F:M ratio was found as 1:1.49. The average length was found as 22.49±0.18 cm in 2017, 22.45±0.12 cm in 2018 and 22.47±0.10 cm in total. Length-weight relationship equations were calculated as W=0.0039×L3.21 in 2017, W=0.0048×L3.15 in 2018, and W=0.0041×L3.19 in total. The spawning period of European hake was determined as autumn (September-December) and spring (March). The first sexual maturity length for females and males were estimated as Lm=28.44 cm and Lm=25.98 cm, respectively. The estimated age composition was 0–6 years for males and 0-8 years for females. Natural, fishing and total mortality rate were calculated as M=0.18 y-1, F=1.03 y-1 and Z=1.21 y-1 respectively. Exploitation ratio was estimated as (E)=0.85 y-1. The length at infinity were calculated as (L?)=48.35 cm, growth coefficient was found to be k=0.26 y-1 and to=-0.79 y for males, (L?)=83.65 cm, (K)=0.13 y-1 ve (t0)=-0.93 y for females and (L?)=105.00 cm, (K)=0.08 y-1 ve (t0)=-1.24 y for total.
Açıklama
Lisansüstü Eğitim Enstitüsü, Su Ürünleri Avlama ve İşleme Teknolojisi Ana Bilim Dalı
Anahtar Kelimeler
Deniz Bilimleri, Marine Science, Su Ürünleri
