Sierra Leone'de Karides Balıkçıları Tarafından Avlanan Pembe Karides, Farfantepenaeus notialis İçin Biyolojik Referans Noktalarının Tahmin Edilmesi

Year 2022, , 103 - 108, 29.12.2022

Komba Jossie Konoyima , Percival Arthur Timothy Showers

https://doi.org/10.46384/jmsf.1101296

Abstract

Av (ton) ve bolluk verilerinden (t/gün) stok tahmini için veri sınırlı durum-alan Bayesian Av-maksimum Sürdürülebilir Ürün (CMSY) yöntemi kullanılarak, Farfantepenaeus notialis’in av ve çaba verilerinin zaman serileri 'R'de analiz edildi. Çalışma, F.notialis'in durumunu sırasıyla I. dönem (1981-1996) ve II. dönem (2008-2018) olarak belirtilen iki kategoride karşılaştırmıştır. I. dönemde Bayesian Schaefer modeli (BSM) analizine dayalı yönetim için sonuçlar (önceki nisbi biyokütle (B/k) = 0,06; MSY = 2,25t , %95 CL = 1,98 - 2,56; Fmsy = 0,379 yıl-1, %95 CL = 0,29 - 0,495; Bmsy = 5,94t , %95 CL = 4,69 - 7,51; Biyokütle = 4,78t; B/Bmsy = 0,806; Balıkçılık ölüm oranı = 0,583yıl-1 ve Yararlanma oranı, F/Fmsy = 1,54) verirken, II. dönem için sonuçlar (önceki nisbi biyokütle (B/k) = 0,35; MSY = 0,662t, %95 CL = 0,567 - 0,773; Fmsy = 0,421yıl-1, %95 CL = 0,314 - 0,563; Bmsy = 1,58t, %95 CL = 1.22 - 2.04; Biyokütle = 1.09t; B/Bmsy = 0.69; Balıkçılık ölüm oranı = 0.532yr-1 ve Yararlanma oranı, F/Fmsy = 1.27) göstermiştir. Sonuç olarak, tüm tahmini biyolojik referans noktaları, 1989-1996 ve 2008-2018 yıllarında F.notialis'in aşırı avcılık durumunu göstermiştir. Sierra Leone'deki stoklar için stok iyileştirme önlemleri şiddetli olarak tavsiye edilmektedir.

Keywords

Bayesian, Yararlanma oranı, Avcılık baskısı, Referans noktası, Stok, Sürdürülebilirlik

Estimating Biological Reference Points of the Pink Shrimp, Farfantepenaeus notialis (Perez-Farfante, 1967) Targeted by Shrimp Trawlers in Sierra Leone

Abstract

Time series of catch and effort data for Farfantepenaeus notialis were analysed in ‘R’ using a data limited state-space Bayesian Catch-maximum Sustainbale Yield (CMSY) method for stock assessment from catch (tonnes) and abundance data (t/day). The study categorically compared the status of F.notialis in two periods (1981-1996) and (2008-2018) denoted as periods I and II, respectively. Results for management based on Bayesian Schaefer model (BSM) analysis for Period I gave (Prior relative biomass (B/k) = 0.06; MSY = 2.25t , 95% CL = 1.98 - 2.56; Fmsy = 0.379 yr-1 , 95% CL = 0.29 - 0.495; Bmsy = 5.94t , 95% CL = 4.69 - 7.51; Biomass = 4.78t; B/Bmsy = 0.806; Fishing mortality = 0.583yr-1 and Exploitation rate, F/Fmsy = 1.54) while that of Period II showed (Prior relative biomass (B/k) = 0.35; MSY = 0.662t, 95% CL = 0.567 - 0.773; Fmsy = 0.421yr-1 , 95% CL = 0.314 - 0.563; Bmsy = 1.58t , 95% CL = 1.22 - 2.04; Biomass = 1.09t; B/Bmsy = 0.69; Fishing mortality = 0.532yr-1 and Exploitation rate, F/Fmsy = 1.27). By implications, all estimated biological reference points portrayed an overfished status of F.notialis in 1989-1996 and in 2008-2018. Stock recovery measures are strongly advised for the stock in Sierra Leone.

Keywords

Exploitation, Fishing Pressure, Stock, Sustainability, Bayesian, Referance point

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