Selectivity of some fish species caught as bycatch by bogue gillnets around North Aegean Sea

Gökhan Subakan; Alkan Öztekin; İsmail Burak Daban; Adnan Ayaz

doi:10.12714/egejfas.2017.34.1.14

EN TR

Selectivity of some fish species caught as bycatch by bogue gillnets around North Aegean Sea

Abstract

In this study, gillnet selectivity of saddled seabream (Oblada melanura), common two-banded seabream (Diplodus vulgaris), annular seabream (Diplodus annularis) and Mediterranean horse mackerel (Trachurus meditterraneus) which were caught by bogue gillnets with 20, 22, 23 and 25 mm mesh size (nominal bar lenght) have been determined. Fishing trials were carried out in Noth Aegean Sea from March 2008 to February 2010. Selectivity parameters were estimated using the Select method. Most suitable selectivity models were calculated as log-normal for saddled seabream (O. melanura) and annular seabream (D. annularis), bi-modal for Mediterranean horse mackerel (T. meditterraneus) and common two-banded seabream (D. vulgaris). Optimum catch lengths for 20, 22, 23 and 25 mm mesh size were 11.15, 12.27, 12.83 ve 13.94 cm for annular seabream (D. annularis), 11.26, 12.39, 12.95 and 14.08 cm for common two-banded seabream (D. vulgaris), 15.3, 16.83, 17.59 and 19.12 cm for saddled seabream (O. melanura) and 26.68, 29.35, 30.68 and 33.35 cm for Mediterranean horse mackerel (T. mediterraneus), respectively. These findings may help us to understand that using higher than 23 mm stretched mesh size with gillnets which have been used for commercial bogue fisheries around north Aegean Sea is important for sustainability of fisheries.

Keywords

Gillnet selectivity,select method,saddled seabream,common two-banded seabream,annular seabream,mediterranean horse mackerel

Kuzey Ege Denizi’nde kupes uzatma ağlarında hedef dışı av olarak yakalanan bazı balık türlerinin seçiciliği

Öz

Bu çalışmada 20, 22, 23 ve 25 mm ağ göz genişliğine sahip kupes uzatma ağlarından yakalanan Melanur (Oblada melanura), Karagöz (Diplodus vulgaris), Isparoz (Diplodus annularis) ve Sarıkuyruk İstavrit (Trachurus meditterraneus) türlerinin uzatma ağı seçiciliği belirlenmiştir. Balikçilik denemeleri Mart 2008 - Şubat 2010 tarihleri arasinda Kuzey Ege Denizi’nde gerçekleştirilmiştir. Seçicilik parametreleri SELECT metot kullanılarak tahmin edilmiştir. En uygun seçicilik modelinin melanur (O. melanura) ve ısparoz (D. annularis) için log-normal, sarıkuyruk istavrit (T. meditterraneus) ve karagöz (D. vulgaris) için ise bi-modal olduğu belirlenmiştir. 20, 22, 23 ve 25 mm ağ göz genişliğinde optimum yakalama boyları sırası ile Isparoz (D. annularis) için 11.15, 12.27, 12.83 ve 13.94 cm, Karagöz (D. vulgaris) için 11.26, 12.39, 12.95 ve 14.08 cm, Melanur (O. melanura) için 15.3, 16.83, 17.59 ve 19.12 cm ve sarıkuyruk istavrit (T. mediterraneus) için 26.68, 29.35, 30.68 ve 33.35 cm olarak tespit edilmiştir. Bu sonuçlar Kuzey Ege Denizi’nde kupes avcılığında kullanılan uzatma ağlarında 23 mm ağ gözü genişliğinden daha büyüğünün kullanımının sürdürülebilir avcılık açısından önemli olduğunu ortaya çıkarmıştır.

Anahtar Kelimeler

Uzatma ağı seçiciliği,select metodu,melanur,karagöz,isparoz,sarıkuyruk istavrit

References

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Details

Primary Language

English

Subjects

-

Journal Section

Research Article

Authors

Gökhan Subakan
CANAKKALE ONSEKIZ MART UNIV
Türkiye

Alkan Öztekin
CANAKKALE ONSEKIZ MART UNIV
Türkiye

İsmail Burak Daban
CANAKKALE ONSEKIZ MART UNIV
Türkiye

Adnan Ayaz
CANAKKALE ONSEKIZ MART UNIV
Türkiye

Publication Date

February 21, 2017

Submission Date

October 11, 2016

Acceptance Date

January 10, 2017

Published in Issue

Year 2017 Volume: 34 Number: 1

DOI

https://doi.org/10.12714/egejfas.2017.34.1.14

IZ

https://izlik.org/JA95JG39TN

Cite

RIS / Bibtex

APA

Subakan, G., Öztekin, A., Daban, İ. B., & Ayaz, A. (2017). Selectivity of some fish species caught as bycatch by bogue gillnets around North Aegean Sea. Ege Journal of Fisheries and Aquatic Sciences, 34(1), 103-110. https://doi.org/10.12714/egejfas.2017.34.1.14

Cited By

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Sade Uzatma Ağları Avcılığında Bazı Balık Türlerinde Farklı Seçicilik Analiz Yöntemlerinin Seçicilik Parametrelerine Olası Etkileri

Çanakkale Onsekiz Mart University Journal of Marine Sciences and Fisheries

https://doi.org/10.46384/jmsf.1449175