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Population characteristics and stock assessment of European anchovy (Engraulis encrasicolus L., 1758) in coastal waters of the south-eastern Black Sea of Turkey

Published online by Cambridge University Press:  21 July 2022

Erhan Çiloğlu Open the ORCID record for Erhan Çiloğlu [Opens in a new window]  and
Cemalettin Şahin Open the ORCID record for Cemalettin Şahin [Opens in a new window]
Erhan Çiloğlu*
Affiliation:
Turgut Kıran Maritime Faculty, Recep Tayyip Erdogan University, 53900 Rize, Turkey
Cemalettin Şahin
Affiliation:
Fisheries Faculty, Recep Tayyip Erdogan University, 53100 Rize, Turkey
*
Author for correspondence: Erhan Çiloğlu, E-mail: [email protected]
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Abstract

This study was carried out throughout 10 fishing seasons between 2002 and 2018 to monitor the population and stock variations of Engraulis encrasicolus (L., 1758) on the south-eastern Black Sea coast of Turkey. Asymptotic length (L∞), growth constant (K) and growth performance indexes (φ) were calculated to be between 12.86 and 15.79 cm, 0.69 and 0.99, 2.10 and 2.29, respectively. Theoretical birth ages were determined to range between (to) −0.15 and −0.27, the maximum ages (tmax) ranged between 3.03 and 4.35, total mortality rates (Z) between 2.19 and 2.66, natural mortality rates (M) between 0.93 and 1.26, the fishing mortality rate (F) between 0.93 and 1.47, and the optimum fishing mortality rate (Fopt.) between 0.37 and 0.62. Fishing mortality rates (F) were estimated to be higher than the optimum fishing mortality rates (Fopt). Z/K ratios were determined to range between 1.91 and 3.43. Current exploitation rates (Ecurr.) were calculated to range between 0.42 and 0.62. The first recruit lengths (Lr) and first capture lengths (Lc50) were estimated to range between from 5.25–7.75 and from 7.66–8.74 cm, respectively. The first maturity lengths (Lm50) of E. encrasicolus ranged between 8.57 and 10.53 cm. The maximum sustainable exploitation levels (Emax) were determined to range between 0.72 and 0.83. These data indicate that if current levels of fishing pressure continue, anchovy stocks will collapse in the near future.

Keywords

Engraulis encrasicolusgrowthmortalityrecruitmentsouth-eastern Black Seastock assessment
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 102 , Issue 3-4 , June 2022 , pp. 186 - 195
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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