Population Structure, Growth and Production of the Wedge Clam Donax trunculus (Bivalvia, Donacidae) in the West Marmara Sea, Turkey

Year 2014, Volume: 14 Issue: 1, - , 07.07.2014

Serhat Çolakoğlu

https://doi.org/10.4194/1303-2712-v14_1_24

Abstract

Population structure, growth, mortality and productivity of the wedge clam, Donax trunculus (Bivalvia, Donacidae), were investigated on high-density sandy beaches (0.5–2 m) west of the Marmara Sea between May 2011 and April 2012. From length – frequency distribution, the parameters of the von Bertalanffy growth function (VBGF) were estimated to be L ∞ = 44.10 mm and K= 0.76 year−1 . The growth performance index (Ø') and the longevity (tmax ) derived from VBGF parameters were 3.17 and 3.95 years, respectively. Growth pattern showed negative allometric growth (b = 2.69). Estimated natural mortality rate (M) was 1.071 year, whereas average mortality (Z) was 1.082 year. Mean abundance and biomass of the studied population were 14.45 ind. m and 92.95 g SFWM m (shell-free wet mass), respectively. Individual production was maximal for 0.66 g SFWM at 28 mm shell length. Annual production of the population was 96.66 g SFWM myear . The annual P/ B ratio was estimated to be 1.04 year. The findings of this study will facilitate adequate stock management during potential commercial exploitation of the wedge clam.

Keywords

Donax trunculus, Population dynamics, growth, mortality, production, Marmara Sea. Batı Marmara Kum Şırlanının Donax trunculus (Bivalvia, Donacidae) Populasyon Yapısı, Büyüme ve Üretimi

Population Structure, Growth and Production of the Wedge Clam Donax trunculus (Bivalvia, Donacidae) in the West Marmara Sea, Turkey

Abstract

Marmara Denizi’nin batısında yüksek yoğunluklu kumsal alanlarda (0,5–2 m), mayıs 2011–nisan 2012 yılları arasında Donax trunculus’un populasyon yapısı, büyüme, ölüm ve üretimi araştırılmıştır. Von Bertalanffy büyüme parametreleri boy–frekans dağılımları kullanılarak hesaplanmış, L∞ = 44,10 mm ve K= 0,76 yıl−1 olarak tahmin edilmiştir. Büyüme performansı indeksi (Ø') ve maksimum yaşam süresi (tmax ) sırasıyla, 3,17 ve 3,95 yıl olarak belirlenmiştir. Büyümenin negatif allometrik (b = 2,69) olduğu tespit edilmiştir. Doğal ölüm oranı (M) 1,071, ortalama ölüm oranı (Z) 1,082 olarak tahmin edilmiştir. Populasyonun ortalama bolluk ve biyoması ise sırasıyla, 14.45 ind. m ve 92,95 g SFWM m olarak belirlenmiştir. Maksimal bireysel üretim 28 mm kabuk boyunda 0.66 g SFWM, populasyonun yıllık üretimi ise 96,66 g SFWM myıl olarak tespit edilmiştir. Yıllık P/ B oranı 1,04 yıl olarak tahmin edilmiştir. Bu çalışmanın sonuçları, stokun potansiyel ticari kullanımı sırasında stok yönetimi açısından kolaylık sağlayacaktır.

Keywords

Donax trunculus, populasyon dinamiği, büyüme, ölüm, üretim, Marmara Denizi

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