Comparison of selectivity of the trawl codends for whiting (Merlangius merlangus euxinus) in the Black Sea

Mustafa Zengin; İlkay Özcan Akpınar; Muharrem Hakan Kaykaç; Zafer Tosunoğlu

doi:10.12714/egejfas.2019.36.3.11

TR EN

Karadeniz’de Mezgit (Merlangius merlangus euxinus) avcılığındaki trol torba seçiciliklerinin karşılaştırılması

Öz

Karadeniz'de toplam mezgit (Merlangius merlangus euxinus) balığı avcılığının büyük bir kısmı, Türkiye kıyılarındaki geleneksel dip trol ağları ile gerçekleştirilmektedir. 40 mm ağ göz büyüklüğünde (40D) baklava gözlü ağlar bu trollerin torbalarında kullanılmaktadır. Bu çalışmada, geleneksel dip trol torbası (40D) ve farklı ağ göz büyüklüğündeki kare gözlü (36S ve 40S) trol torbaları mezgit balığının boy seçiciliği için mukayese edildi. Seçicilik verileri bir örtü torba yöntemi kullanılarak toplandı ve çekimler arası varyasyonlar hesaba katılarak analiz edildi. Seçicilik parametreleri CC2000 programı kullanılarak hesaplandı. Sonuçlar ticari olarak kullanılan 40D trol torbasının mezgit balığının olgunlaşmamış bireyleri için seçici olmadığını göstermiştir. Oysa baklava gözlü (40D) trol torbası yerine kare gözlü torba (36S ve 40D) değişikliği mezgit balığı için ağ göz seçiciliğini önemli ölçüde artırmıştır. 40S trol torbası 15,74 cm yüzde elli yakalanma oranı (L₅₀) ile ilk üreme boyundan daha yüksektir (L_M50). Sonuç olarak çalışmada denemeye alınan farklı ağ göz boyundaki tüm kare gözlü torbalar, mezgit balığının karaya çıkarılma büyüklüğü (MLS) göz önünde bulundurulduğunda uygun seçicilik sağlamıştır.

Anahtar Kelimeler

Karadeniz,mezgit,torba seçiciliği,baklava gözlü ağ,kare gözlü ağ

Comparison of selectivity of the trawl codends for whiting (Merlangius merlangus euxinus) in the Black Sea

Abstract

A large part of the total whiting (Merlangius merlangus euxinus) fishing in the Black Sea is carried out with the traditional bottom trawl nets along the coast of Turkey. Diamond mesh shape with 40 mm mesh size (40D) has been used in the codends of these trawls. In this study, the traditional trawl codend (40D) and square-mesh codend with different size (36S and 40S) were compared for whiting size selectivity in August 2014. Selectivity data were collected by using a covered codend method and analysed taking between haul variations in to account. The selectivity parameters were estimated by using CC2000 software. Results showed that commercially used 40D trawl codend is not selective enough to release immature of whiting. However, the net change in square mesh (36S and 40S) instead of a diamond-shaped (40D) mesh significantly improved the mesh selectivity for whiting. The 40S trawl codend is even higher than the first maturity size (L_M50) with a length at fifty percent retention (L₅₀) of 15.74 cm. In conclusion all square mesh codends with different mesh size tested here supplied appropriate selection considering minimum landing size (MLS) of whiting.

Keywords

The Black Sea,whiting,codend selectivity,diamond mesh,square mesh

Supporting Institution

European Union

Project Number

EU-FP7-312008

Thanks

This work was financed by the European Project “BENTHIS (EU-FP7-312008)”. The authors would like to thanks and gratitude to the project leader Prof. Dr. Adrian RJINSDORP providing all kinds of support. Thanks are also due to all the project researchers for participating the sea trials.

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Details

Primary Language

English

Subjects

-

Journal Section

Research Article

Authors

Mustafa Zengin
0000-0002-0243-1432
Türkiye

İlkay Özcan Akpınar
0000-0003-1421-984X
Türkiye

Muharrem Hakan Kaykaç ^*
0000-0002-4807-707X
Türkiye

Zafer Tosunoğlu
0000-0002-1168-9611
Türkiye

Publication Date

September 15, 2019

Submission Date

February 13, 2019

Acceptance Date

July 1, 2019

Published in Issue

Year 2019 Volume: 36 Number: 3

DOI

https://doi.org/10.12714/egejfas.2019.36.3.11

IZ

https://izlik.org/JA69CX22NK

Cite

RIS / Bibtex

APA

Zengin, M., Özcan Akpınar, İ., Kaykaç, M. H., & Tosunoğlu, Z. (2019). Comparison of selectivity of the trawl codends for whiting (Merlangius merlangus euxinus) in the Black Sea. Ege Journal of Fisheries and Aquatic Sciences, 36(3), 301-311. https://doi.org/10.12714/egejfas.2019.36.3.11

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