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Bilgin, Sabri; Bal, Hatice; Taşçı, Burak

doi:10.4194/1303-2712-v12_4_15

Cited by 12 publications

(3 citation statements)

References 9 publications

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“…Moreover, the Rn value of the non-seasonal VBG curves for S. guttatus improved by 21% after fitting a seasonal VBG curve. Seasonal changes in fish growth mostly caused by differences in water temperature and reproductive activities affecting fish feeding mechanism (Bilgin et al, 2012;Bilgin et al, 2013). In the literature, reproduction time was reported during June and July in the Bay of Bengal (Rashid et al, 2010), from January to August, with a peak in April and May off the south coast of India (Devaraj, 1987), from April to July around Rameswaram Island between India and Sri Lanka (Collette and Nauen, 1983).…”

Section: Discussionmentioning

confidence: 99%

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Ahmed¹,

Bilgin²,

Bat³

2016

Turk. J. Fish. Aquat. Sci.

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Section: Discussionmentioning

confidence: 99%

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Ahmed¹,

Bilgin²,

Bat³

2016

Turk. J. Fish. Aquat. Sci.

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“…It is caught with gillnets in the Sea of Marmara and is among the most caught species as bycatch in shrimp fisheries by beam trawl. Previous studies on whiting were mostly concentrated in the Black Sea (Düzgüneş and Karaçam, 1990;Erkoyuncu et al, 1994;Samsun, 1995;Şahin and Akbulut, 1997;Samsun and Erkoyuncu, 1998;Kalaycı et al, 2007;Bilgin et al, 2012;Kasapoğlu and Düzgüneş, 2014;Mazlum and Bilgin, 2014;Samsun and Akyol, 2017;Taylan et al, 2018;Türker and Bal, 2018;Balık and Öztaş, 2019;Yıldız and Karakulak, 2019;Aksu, 2020).…”

Section: Introductionmentioning

confidence: 99%

Current Status, Management, and Future Prospects of Whiting (Merlangius merlangus) in the Sea of Marmara

Karadurmuş

2022

Acta Aquatica Turcica

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The current status of whiting (Merlangius merlangus Linnaeus, 1758) populations in the Sea of Marmara (Turkey) was evaluated by estimating growth and mortality rates in this study. The overall sex ratio (M:F) was calculated as 1:1.36. b value of LWR computed as 2.8904 for both sex groups, and M. merlangus showed a negative allometric growth type by Pauly's t-test result. The age of individuals in the population ranged from I to VI. The growth parameters were estimated as L∞ = 35.74 cm, k = 0.124 yr -1 , and t0 = -1.338 years for all individuals. Total mortality (Z), natural mortality (M), and fishing mortality (F) rates were calculated as 1.35 yr -1 , 0.34 yr -1, and 1.01 yr -1 , respectively. The Phi-prime growth index (φ′) and exploitation rate (E) of the population were calculated as 2.20 and 0.75 yr -1 . According to the results, it is obvious that the whiting stocks in the Marmara Sea are currently used at a high capacity (E = 0.75 yr -1 ). The impact of over-fishing can have increasingly detrimental effects on the overall population size of this population. Fisheries management practices in the Marmara Sea should be regulated by taking into account the ecosystem change, fishing fleet, and unreported catch data. In addition, temporal or spatial fishing bans can be applied by increasing the selectivity of fishing gear. Keywords Age  Growth  Exploitation rate  Marmara Sea  LWR Özet: Bu çalışmada, Marmara Denizi'ndeki (Türkiye) mezgit (Merlangius merlangus Linnaeus, 1758) popülasyonunun büyüme ve ölüm oranları tahmin edilerek mevcut durumu değerlendirilmektedir. Cinsiyet oranı (E:D) 1:1,36 olarak hesaplanmıştır. LWR b değeri her iki cinsiyet için 2,8904 olarak hesaplandı ve Pauly's t-testi sonuçlarına göre mezgit popülasyonu negatif allometrik büyüme gösterdi. Popülasyondaki bireylerin yaşları I ile VI arasında değişim göstermiştir. Büyüme parametreleri, tüm bireyler için L∞ = 35,74 cm, k = 0,124 yıl -1 , and t0 = -1,338 yıl olarak tahmin edilmiştir. Toplam ölüm (Z), doğal ölüm (M) ve balıkçılık ölüm (F) oranları sırasıyla 1,35 yıl -1 , 0,34 yıl -1 and 1,01 yıl -1 olarak hesaplanmıştır. Popülasyonun Phi-prime büyüme indeksi (φ′) ve sömürü oranı (E) 2,20 ve 0,75 yıl -1 olarak hesaplanmıştır. Sonuçlara göre Marmara Denizi'ndeki mezgit stoklarının şu anda yüksek kapasitede kullanıldığı aşikardır (E = 0,75). Aşırı avlanmanın etkisi, genel popülasyon büyüklüğü üzerinde giderek daha fazla zararlı etkiye sebep olabilir. Marmara Denizi'ndeki ekosistem değişimi, balıkçı filosu ve rapor edilmemiş av verileri dikkate alınarak balıkçılık yönetimi uygulamaları düzenlenmelidir. Av araçlarının seçiciliği artırılarak zamansal veya mekânsal avlanma yasakları uygulanabilir.

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“…It is a bento-pelagic species also called Black Sea whiting is caught by different fishing gears such as bottom trawl, gill nets and fishing lines. Some studies report that the length of the first maturity (L M50 ) of whiting is 12.9-14.7 cm for females and 12.5-13.9 cm for males (İşmen, 2002;Bilgin et al, 2012). At the same time, the Minimum Landing Size (MLS) of this species is stated to be 13 cm (Anonymous, 2016).…”

Section: Introductionmentioning

confidence: 99%

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

Zengin

Akpinar

Kaykaç

et al. 2019

EgeJFAS

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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 (LM50) 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.

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Cited by 12 publications

References 9 publications

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Current Status, Management, and Future Prospects of Whiting (Merlangius merlangus) in the Sea of Marmara

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

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