Journals / Su Ürünleri Dergisi / 2016 / Cilt: 33 - Sayı: 2

Evaluation of anchovy (Engraulis encrasicolus) population dynamics studies (1985-2015) in terms of fisheries management in the Black Sea

Karadeniz’de hamsi (Engraulis encrasicolus) popülasyon dinamiği üzerine yapılmış çalışmaların (1985-2015) balıkçılık yönetimi açısından değerlendirilmesi

Pages
169–182
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

It has been proposed the creation of the Black Sea anchovy fishery management system for sustainable anchovy fisheries in the Black sea

📌 3 Key Takeaways

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Objective & Hypothesis:In this study, the result on population dynamics of European anchovy (Engraulis encrasicolus) were evaluated from the present to the past 30 years in the Black Sea and is intended to contribute to the creation of the Black Sea anchovy fishery management system.
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Key Findings & Data:In studies presented catch composition, growth parameters, the average length values in ages, the mean length values in general, mortality rates and exploration rates were evaluated in the fishing seasons and five-years periods. 0 years of age composition of individuals not reached sexual maturity was estimated as 27.4 ± 3.6% (n = 26 studies), and this ratio was calculated as 32.7±9.04% for 1985 – 1990 period (n = 7 studies), 39.6±7.76% for 1990 – 1995 (n = 5 studies), 24.2±3.56% for 1995 – 2000 (n = 7 studies), 14.5±4.55% for 2000 – 2005 (n = 5 studies) and 22.1±21.1% for 2005 – 2010 (n = 2 studies).
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Conclusion & Impact:It has been proposed the creation of the Black Sea anchovy fishery management system for sustainable anchovy fisheries in the Black sea
🔬Design:Research Article
📍Scope:2000 Verileri
⚙️Variables:Domain Parameters

Abstract

In this study, the result on population dynamics of European anchovy (Engraulis encrasicolus) were evaluated from the present to the past 30 years in the Black Sea and is intended to contribute to the creation of the Black Sea anchovy fishery management system. In studies presented catch composition, growth parameters, the average length values in ages, the mean length values in general, mortality rates and exploration rates were evaluated in the fishing seasons and five-years periods. 0 years of age composition of individuals not reached sexual maturity was estimated as 27.4 ± 3.6% (n = 26 studies), and this ratio was calculated as 32.7±9.04% for 1985 – 1990 period (n = 7 studies), 39.6±7.76% for 1990 – 1995 (n = 5 studies), 24.2±3.56% for 1995 – 2000 (n = 7 studies), 14.5±4.55% for 2000 – 2005 (n = 5 studies) and 22.1±21.1% for 2005 – 2010 (n = 2 studies). Zero-year-old age composition was not significantly difference in the five-years periods (one-way ANOVA; P > 0.05). The von Bertalanffy growth function (VBGF) parameters; asymptotic length (L∞) values were ranged between 14.1 – 23.5 cm (mean: 17.0±0.38 cm) and brody growth coefficient (K) values were ranged between 0.139 – 0920 year-1 (mean: 0.331 ±0.031 year-1). The VBGF was calculated as Lt = 17.0±0.4(1 – e-0.331±0.031(t+2.344±0.233) (n = 26 studies). A relationship between L∞ and K values was calculated as K = 1105.3L∞-2.8958 (r2 = 0.6224, n = 26). The relationship between natural mortality ratio (M) and K values was determined as M = 0.7171K0.3073 (r2 = 0.2982; n = 26). Regression coefficients of this equations were found to be statistically different from zero (P 0.5; F > M). It has been proposed the creation of the Black Sea anchovy fishery management system for sustainable anchovy fisheries in the Black sea

Özet

Bu çalışmada, hamsi (Engraulis encrasicolus) üzerine 1985 yılından günümüze son 30 yılda yapılan popülasyon dinamiği çalışmalarından elde edilen sonuçlar değerlendirilmiş ve Karadeniz'de hamsi balıkçılık yönetim sisteminin oluşturulmasına katkı sağlamak amaçlanmıştır. Araştırmalarda sunulan av kompozisyonu, büyüme parametreleri, yaşlardaki ortalama boy değerleri, genel ortalama boy değerleri, ölüm oranları ve işletme oranları av sezonlarına ve beş yıllık periyotlara göre değerlendirilmiştir. Cinsi olgunluğa ulaşmamış sıfır yaşındaki bireylerin av içerisindeki oranı ortalama %27,4±3,6 (n = 26 çalışma) olup, bu oran 1985 - 1990 için %32,7±9,04 (n = 7 çalışma), 1990 - 1995 için %39,6±7,76 (n = 5 çalışma), 1995 - 2000 için %24,2±3,56 (n = 7 çalışma), 2000 - 2005 için %14,5±4,55 (n = 5 çalışma) ve 2005 - 2010 için ise %22,1±21,1 (n = 2 çalışma) şeklinde tespit edilmiştir. Sıfır yaşındaki bireylerin beş yıllık dönemlerdeki oranları arasındaki istatistiki fark önemsiz bulunmuştur (one-way ANOVA, P = 0,2256). von Bertalanffy büyüme denklemi (VBBD) parametrelerinden asimptotik boy (L?) değeri 14,1 - 23,5 cm arasında (ortalama: 17,0±0,38 cm), büyüme katsayısı (K) değeri ise 0,139 - 0,920 yıl-1 arasında (ortalama: 0,331 ±0,031 yıl-1) tespit edilmiştir. VBBD Lt = 17,0±0,4(1 - e-0,331±0,031(t+2,344±0,233) şeklinde (n = 26 çalışma) hesaplanmıştır. L? ve K değerleri arasında K = 1105,3L?-2,8958 (r2 = 0,6224, n = 26) şeklinde (P 0,5; F > M) belirlenmiştir. Hamsi stokunun devamlılığı ve en yüksek ürünü elde etmek için yıllık av miktarı ve av çabasının kontrol altına alınması, hamsi stok belirleme çalışmaları neticesinde kota uygulamasına geçilmesi ve Karadeniz'de hamsi balıkçılık yönetim sisteminin oluşturulması önerilmiştir

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Cite This Article

BİLGİN, S., SÜMER, Ç., BEKTAŞ, S., SATILMIŞ, H. H., BIRCAN, R. (2016). Evaluation of anchovy (Engraulis encrasicolus) population dynamics studies (1985-2015) in terms of fisheries management in the Black Sea. Su Ürünleri Dergisi, Cilt: 33 - Sayı: 2, 169–182. https://ajindex.com/articles/311102

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