Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries

Erhan Çiloğlu; Cemalettin Şahin

doi:10.35229/jaes.1628391

TR EN

Güneydoğu Karadeniz balıkçılığında mezgit (Merlangius merlangus) bolluğu ve stoklarının yönetimi için stratejiler

Abstract

Bu çalışmada, Doğu Karadeniz'deki ticari trol balıkçılığından 1,579 Merlangius merlangus örneklenmiştir. Toplanan örneklerin büyüme, stoka katılım ve stok yapısı FISAT-II yazılım paketindeki ELEFAN-I, Y/R, B/R, VPA ve Thompson ve Bell modelleri kullanılarak değerlendirilmiştir. Asimptotik boy (L∞), büyüme sabiti (K) ve t0 dahil olmak üzere von Bertalanffy büyüme parametreleri sırasıyla 40,89 cm, 0,10 cm ve -1,1411 cm olarak hesaplanmıştır. İlk yakalama boyu (Lc50) 11,82 cm ile 13,40 cm arasında değişmiştir. Toplam, doğal ve balıkçılık ölüm oranları sırasıyla 0,85, 0,29 ve 0,56 olarak tahmin edilmiştir. Mart, Ağustos ve Kasım aylarında meydana gelen üç farklı katılım dönemi tespit edilmiştir. VPA verilerine dayanarak, sabit biyokütlenin yaklaşık 569.620,7 ton olduğu tahmin edilmiştir. Analiz, mezgit için maksimum sürdürülebilir verime (MSY) 0,66'lık bir sömürü oranı ile ulaşılabileceğini göstermektedir. Thompson ve Bell yöntemi kullanılarak 0,56 F faktörü ile 449,70 ton olarak hesaplanan mevcut sömürü seviyesinde biyokütle azalmıştır. MSY'yi temsil eden 1,0'lık bir F faktörü 498,180 tona karşılık gelmektedir. Mevcut avlanma oranında (F = 0.56), biyokütle avlanmamış durumdaki 666,206 metrik tondan %25 (168,026 ton) azalmıştır.

Keywords

Whiting,, stoklara katılım başına nispi verim (Y'/R),, biyokütle başına nispi verim (B'/R),, maksimum sürdürülebilir verim (MSY),, stok,, doğu Karadeniz.

Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries

Abstract

In this study, 1.579 Merlangius merlangus were sampled from commercial trawl fisheries in the Eastern Black Sea. The collected samples' growth, recruitment, and stock structure were evaluated using the ELEFAN-I, Y/R, B/R, VPA, and Thompson and Bell models in the FISAT-II software package. The von Bertalanffy growth parameters, including asymptotic length (L∞), growth constant (K), and t0, were calculated as 40.89 cm, 0.10 cm, and -1.1411 cm, respectively. The first catch length (Lc50) varied between 11.82 cm and 13.40 cm. Total, natural, and fishing mortality rates were estimated at 0.85, 0.29, and 0.56, respectively. Three distinct recruitment periods were identified, occurring in March, August, and November. Based on VPA data, the fixed biomass was estimated at approximately 569,620.7 tonnes. The analysis suggests that the maximum sustainable yield (MSY) for whiting could be reached with an exploitation rate of 0.66. At the current exploitation level, calculated at 449.70 tonnes using the Thompson and Bell method with an F-factor of 0.56, the biomass has decreased. An F-factor of 1.0, representing the MSY, corresponds to 498.180 tonnes. At the current fishing rate (F = 0.56), the biomass has been reduced by 25% (168,026 tonnes) from its unfished state of 666,206 metric tonnes.

Keywords

Eastern Black Sea,, maximum sustainable yield (MSY),, recruitment,, relative yield per recruit (Y'/R),, relative yield per biomass (B'/R),, stock,, whiting.

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Details

Primary Language

English

Subjects

Fisheries Management, Aquaculture and Fisheries Stock Assessment

Journal Section

Research Article

Authors

Erhan Çiloğlu ^*
0000-0002-9995-0377
Türkiye

Cemalettin Şahin
0000-0002-7924-3536
Türkiye

Early Pub Date

May 15, 2025

Publication Date

May 30, 2025

Submission Date

January 28, 2025

Acceptance Date

May 7, 2025

Published in Issue

Year 2025 Volume: 10 Number: 3

DOI

https://doi.org/10.35229/jaes.1628391

IZ

https://izlik.org/JA29YR77SC

APA

Çiloğlu, E., & Şahin, C. (2025). Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries. Journal of Anatolian Environmental and Animal Sciences, 10(3), 267-276. https://doi.org/10.35229/jaes.1628391

AMA

1.Çiloğlu E, Şahin C. Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries. JAES. 2025;10(3):267-276. doi:10.35229/jaes.1628391

Chicago

Çiloğlu, Erhan, and Cemalettin Şahin. 2025. “Abundance and Stock Management of Whiting (Merlangius Merlangus) in Southeastern Black Sea Fisheries”. Journal of Anatolian Environmental and Animal Sciences 10 (3): 267-76. https://doi.org/10.35229/jaes.1628391.

EndNote

Çiloğlu E, Şahin C (May 1, 2025) Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries. Journal of Anatolian Environmental and Animal Sciences 10 3 267–276.

IEEE

[1]E. Çiloğlu and C. Şahin, “Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries”, JAES, vol. 10, no. 3, pp. 267–276, May 2025, doi: 10.35229/jaes.1628391.

ISNAD

Çiloğlu, Erhan - Şahin, Cemalettin. “Abundance and Stock Management of Whiting (Merlangius Merlangus) in Southeastern Black Sea Fisheries”. Journal of Anatolian Environmental and Animal Sciences 10/3 (May 1, 2025): 267-276. https://doi.org/10.35229/jaes.1628391.

JAMA

1.Çiloğlu E, Şahin C. Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries. JAES. 2025;10:267–276.

MLA

Çiloğlu, Erhan, and Cemalettin Şahin. “Abundance and Stock Management of Whiting (Merlangius Merlangus) in Southeastern Black Sea Fisheries”. Journal of Anatolian Environmental and Animal Sciences, vol. 10, no. 3, May 2025, pp. 267-76, doi:10.35229/jaes.1628391.

Vancouver

1.Erhan Çiloğlu, Cemalettin Şahin. Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries. JAES. 2025 May 1;10(3):267-76. doi:10.35229/jaes.1628391

EBSCOHost Scilit CABI

JAES/AAS-Journal of Anatolian Environmental and Animal Sciences/Anatolian Academic Sciences&Anadolu Çevre ve Hayvancılık Dergisi/Anadolu Akademik Bilimler-AÇEH/AAS

Güneydoğu Karadeniz balıkçılığında mezgit (Merlangius merlangus) bolluğu ve stoklarının yönetimi için stratejiler

Abstract

Keywords

Abundance and stock management of whiting (Merlangius merlangus) in Southeastern Black Sea fisheries

Abstract

Keywords

References

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Subjects

Journal Section

Authors

Early Pub Date

Publication Date

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Acceptance Date

Published in Issue

DOI

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