A comparative assessment of the Black Sea anchovy stock using holistic production and analytical age structure models

The Black Sea anchovy (Engraulis encrasicolus) is economically and ecologically the most importantcommercial fish species in the Black Sea. Therefore, a management plan targeting the maximum sustainableyield has gained importance in recent years. The present study aims to provide a comprehensive assessment byusing only Turkish data to evaluate the status of the Black Sea anchovy stock and compare the differentapproaches outcomes. For this, ASPIC (1968-2014) as a holistic production model and XSA (2005-2014) asan age-structured model are used. ASPIC estimates that the Black Sea's carrying capacity (K) is 1.2 milliontons of anchovy, and to achieve the MSY of 244kton fish, 610kton (BMSY) fish must be present in the sea. Itis estimated B2015 is 399ktons; this shows, now, there are 35% fewer fish present in the sea. Hence, the BlackSea anchovy is exposed to low overfishing. In XSA, the stock-recruitment relationship could not be established.Therefore, the current status of anchovy stock is estimated by Patterson’s (1992) precautionary exploitationrate of Etarget=0.4 as a reference point. Accordingly, the current exploitation rate is calculated as Ecurrent=0.5,which is 25% higher than the Etarget. Hence, XSA results also suggest that the Black Sea anchovy is exposedto low overfishing. This result and the comparable parameter of F of the two models show the concordanceand comparability of holistic (ASPIC) and analytic (XSA) models.
Acta Biologica Turcica


Akkuş, Gizem; Gücü , Ali Cemal; Department of Marine Biology and Fisheries (2016-10-10)
Economically the most important fish species in Turkey is the Black Sea anchovy (Engraulis encrasicolus). It provides 60% of the total fish catch amongst all Turkish fisheries. However this precious resource has, so far, been exploited recklessly disregarding the consequences. Moreover, the reasons for the dramatic fluctuations in the quantity of anchovy landings over the years are poorly known. A sound management plan targeting maximum sustainable yield therefore necessitates scientifically proven stock as...
A Study on possible variant forms of anchovy in the black sea
Şahin, Ezgi; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2014)
The anchovy in the Black Sea is a commercially important fish source for Turkey, which is represented by two different subspecies in the basin. Spawning and feeding occurs in northern coasts where food supplies are more abundant. When the water temperature starts to decrease, the anchovy migrate toward the warmer waters of the southern coasts. The schools formed during this migration make them a primary target for fishing fleets. Due to morphological similarities, it is not possible to report the catches by...
Stock assessment of the Black Sea anchovy
Tutar, Özge; Gücü, Ali Cemal; Department of Marine Biology and Fisheries (2014)
The Black Sea anchovy (Engraulis encrasicolus) is economically the most important fish species in Turkey since it provides 60% of the total fish catch. The Turkish fleet catches 90% of the anchovy stock in the Black Sea due to the anchovy winter migration to the Turkish coast. Over the last 50 years, the Black Sea basin has been subjected to pollution due to human sourced nutrient accumulation in the NW basin via the rivers Danube, Dniester and Dnieper and transportation. The ecosystem has been destroyed by...
Güraslan, Ceren; Fach Salihoğlu, Bettina; Department of Oceanography (2016-10-21)
Black Sea anchovy (Engraulis encrasicolus ponticus) undertake extensive (~1000km long) overwintering migration in autumn from northern spawning grounds to the overwintering areas located at the south-eastern coasts of the Black Sea. When arriving at the Anatolian coast, they support important fisheries in Turkey. Black Sea anchovy is known to experience stock variability quite frequently including stock collapses, which are believed to be closely linked with environmental conditions. Therefore, it is of imp...
A study on cobalt adaptation and memory retention of freshwater bacteria isolates
Çıtır, Gözde; Gözen, Ayşe Gül; Department of Biology (2010)
The mucus-dwelling bacteria previously isolated from the surface of a freshwater fish species (Alburnus alburnus from Lake Mogan, Ankara), were studied to discover their cobalt resistance. The minimum inhibitory concentrations (MIC) were determined for a total of thirty six bacterial isolates. The results of the resistance studies led us to design experiments on adaptation to cobalt and subsequent memory retention. Three selected isolates were exposed to an inhibitory cobalt concentration as a mixed culture...
Citation Formats
G. Akkuş and A. C. Gücü, “A comparative assessment of the Black Sea anchovy stock using holistic production and analytical age structure models,” Acta Biologica Turcica, no. 35(3), pp. 1–12, 2022, Accessed: 00, 2022. [Online]. Available: https://hdl.handle.net/11511/101012.