Length-weight relationships, growth parameters, mortality and condition factor of Atlantic bonito (Sarda sarda Bloch, 1793) from the Southern Black Sea

Abstract

The small tuna known as the Atlantic bonito (Sarda sarda) is one of the most important fishery species on the Black Sea coast of Türkiye. In this study, we sought to define some population parameters of Atlantic bonito based on indirect ageing using length frequency distributions. The aim of this study is to provide data that will serve the management of the bonito fishery. For analysis, the ELEFAN routine in the LFDA and FiSAT programs was utilized. During the migration period, we collected 2110 samples from purse seine (n=1009), gillnet (n=867) and hand lines (n=234) fishing in the Black Sea waters of Türkiye. The fork length varied between 13.1 and 60 cm, and the female-to-male ratio was 1:0.79. The length-weight relationships (LWRs) were calculated W=0.0037FL3.3784 and Fulton’s K:1.01±0.001. The growth was found to be positive allometric (Student’s t-test, p < 0.05). von Bertalanffy Growth Parameters (VBGP) were computed as L∞:71.59 cm, K:0.56 year-1, t0:-0.18 year. The seasonal oscillation in growth rate was calculated (C: 0.98) and winter point (WP): 0.54, growth performance index of Ø’: 3.46, natural mortality (M: 0.74 yr-1), fishing mortality (F: 2.81 yr-1), total mortality (Z: 3.55 yr-1) and exploitation coefficient (E: 0.79 yr-1). As a result, the exploitation rate of S. sarda in the study area was found to be high.

Keywords

• Sarda sarda
• Black Sea
• LFDA
• ELEFAN
• Condition factor
• Growth parameters

Supporting Institution

TAGEM

Project Number

TAGEM/HAYSÜD/2006/09/02/02

Thanks

The General Directorate of Agricultural Research and Policies (GDAR) TAGEM/HAYSÜD/2006/09/02/02) provided funding for this work

Güney Karadeniz'de yayılış gösteren Palamut Balığı (Sarda sarda Bloch, 1793)'nın boy-ağırlık ilişkileri, büyüme parametreleri, ölüm oranları ve kondisyon faktörü

Abstract

Atlantik palamudu olarak bilinen küçük orkinoslardan Sarda sarda, Türkiye'nin Karadeniz kıyılarının en önemli balıkçılık türlerinden biridir. Bu çalışmada, boy frekans dağılımları kullanılarak boya dayalı olarak palamut balığının bazı popülasyon parametrelerini tanımlamaya çalışıldı. Bu çalışmanın amacı palamut balıkçılığının yönetimine hizmet edecek sonuçlar sağlamaktır. Çalışmada verilerin analizi için LFDA ve FiSAT programlarındaki ELEFAN rutini kullanıldı. Palamut balığının Türkiye'nin Karadeniz sularında göçü boyunca gırgır (n=1009), uzatma ağları (n=867) ve olta (n=234) ile avlanan 2110 örnek toplanıldı. Örneklenen bireylerin çatal boyu 13,1 ile 60 cm arasında değişmekte olup, dişi/erkek oranı 1:0,79'dur. Boy-ağırlık ilişkileri (LWRs) W=0,0037FL3,3784 ve Fulton's K:1,01±0,001 olarak hesaplanmıştır. Çalışma sonucunda büyümenin pozitif allometik olduğu bulunmuştur (Student's t-test, p < 0,05). von Bertalanffy Büyüme Parametreleri (VBGP) L∞:71,59 cm, K:0,56 yıl-1, t0:-0,18 yıl olarak hesaplanmıştır. Büyüme oranındaki mevsimsel salınım (C: 0,98) ve kış noktası (WP): 0,54, Ø' büyüme performansı indeksi 3,46 olarak hesaplanmıştır. Doğal ölüm (M: 0.74 yr-1), balıkçılık ölüm (F: 2,81 yr-1), toplam ölüm (Z: 3,55 yr-1) ve sömürü katsayısı (E: 0,79 yr-1) olarak hesaplanmıştır. Çalışma sonucunda Karadeniz boyunca S.sarda'da işletme oranının yüksek olduğu tespit edilmiştir.

Keywords

• Sarda sarda
• Karadeniz
• LFDA
• ELEFAN
• Kondisyon faktörü
• Büyüme parametreleri

Supporting Institution

TAGEM

Project Number

TAGEM/HAYSÜD/2006/09/02/02

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