Retention probability of purse seine grating sieve based on fish morphology

Zafer Tosunoğlu; Sinan Mavruk; Nazlı Kasapoğlu

doi:10.12714/egejfas.38.2.06

TR EN

Balık morfolojisine göre gırgır boylama eleğinin alıkoyma olasılığı

Öz

Gırgır teknelerinin güvertesine yerleştirilen çift ızgaralı eleğin alıkoyma-bırakma özellikler dört tür (Sardina pilchardus, Sardinella aurita, Engraulis encrasicolus ve Boops boops) için toplam uzunluk (TL) - maksimum yükseklik (Hmax) ve TL - maksimum genişlik (Wmax) ilişkilerinden tahmin edilerek ele alınmıştır. Bu ilişkileri ortaya çıkarmak için, 3 Nisan 2017 ile 21 Mart 2018 tarihleri arasında İzmir Körfezi'nde (Türkiye) gırgır örneklemeleri yapılmıştır. Ele alınan türler için regresyon eşitlikleri tanımlandıktan sonra, Sechin'in seçicilik yaklaşımının bir uyarlaması kullanılarak, her bir türün farklı çubuk aralığındaki elekler tarafından yakalanma olasılıkları hesaplanmıştır. Sonrasında minimum yasal boy ya da ilk eşeysel olgunluk boyuna karşılık gelen optimal elek çubuk aralığı (OEÇA) değerleri, her tür için ayrı ayrı hesaplanmıştır. OEÇA değerleri sardalya (Sardina pilchardus) için 10.97 mm, yuvarlak sardalya (Sardinella aurita) için 11.29 mm, hamsi (Engraulis encrasicolus) için 7.78 mm ve kupes (Boops boops) için 17.89 mm olarak bulunmuştur. Çubuk aralığı düzenlemeleri, Ege Denizi’ndeki gırgır avcılığı için yakalama boyunun altındaki balıkların serbest bırakılması için umut verici bir yönetim önlemi olabilir.

Anahtar Kelimeler

Retention probability of purse seine grating sieve based on fish morphology

Abstract

The retention-releasing patterns of the double-grid grating sieve placed on the deck of the purse seiners were revealed for four case species (Sardina pilchardus, Sardinella aurita, Engraulis encrasicolus and Boops boops) using a simulated data predicted from total length (TL) – maximum height (Hmax) and TL – maximum width (Wmax) regressions. To calculate these relationships, samples were collected during commercial purse seine operations between 3 April 2017 and 21 March 2018 in Izmir Bay, Aegean Sea (Turkey). Optimal Bar Spacing (OBS) values corresponding to minimum landing sizes or the length at first maturity were calculated separately for each species. OBS values were found 10.97 mm for sardine (Sardina pilchardus), 11.29 mm for round sardine (Sardinella aurita), 7.78 mm for anchovy (Engraulis encrasicolus) and 17.89 mm for bogue (Boops boops). The bar spacing regulations may constitute a promising management measure to release undersized fish for the purse seine fishery in the Aegean Sea.

Keywords

Supporting Institution

Ege University Scientific Research Project Coordination Unit; Ministry of Agriculture and Forestry, General Directorate Agriculture Research and Policies

Project Number

2017/SUF/002; TAGEM/HAYSUD/2015/A11/P02/8

Thanks

The present study was funded by the Ege University Scientific Research Project Coordination Unit (Project No. 2017/SUF/002) and Ministry of Agriculture and Forestry, General Directorate Agriculture Research and Policies (Grant number: TAGEM/HAYSUD/2015/A11/P02/8). The authors would like to thank the captain and crew of purse seiner Afala and also researchers involved in the projects.

References

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Details

Primary Language

English

Subjects

Fisheries Management

Journal Section

Research Article

Authors

Zafer Tosunoğlu
0000-0002-1168-9611
Türkiye

Sinan Mavruk ^*
0000-0003-1958-0634
Türkiye

Nazlı Kasapoğlu
0000-0001-5526-778X
Türkiye

Publication Date

June 15, 2021

Submission Date

October 28, 2020

Acceptance Date

January 21, 2021

Published in Issue

Year 2021 Volume: 38 Number: 2

DOI

https://doi.org/10.12714/egejfas.38.2.06

IZ

https://izlik.org/JA76YX62PP

Cite

RIS / Bibtex

APA

Tosunoğlu, Z., Mavruk, S., & Kasapoğlu, N. (2021). Retention probability of purse seine grating sieve based on fish morphology. Ege Journal of Fisheries and Aquatic Sciences, 38(2), 173-180. https://doi.org/10.12714/egejfas.38.2.06