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Biometrics, growth, and age of European eel, Anguilla anguilla in the Lake Bafa, Türkiye

Published online by Cambridge University Press:  03 September 2025

Nurbanu Partal ,
Hakan Ayyıldız Open the ORCID record for Hakan Ayyıldız [Opens in a new window] ,
Emine İnci Balkan  and
Şükran Yalçın Özdilek Open the ORCID record for Şükran Yalçın Özdilek [Opens in a new window]
Nurbanu Partal
Affiliation:
Şahintepe Mahallesi, Muratdere Caddesi, Başakşehir/İstanbul, Turkey
Hakan Ayyıldız*
Affiliation:
Marine Science and Technology Faculty, Department of Fisheries Industry Engineering, Çanakkale Onsekiz Mart University, Çanakkale, Türkiye
Emine İnci Balkan
Affiliation:
Demiroglu Bilim University, Vocational School of Health Services, Medical Laboratory Techniques, Istanbul, Türkiye
Şükran Yalçın Özdilek
Affiliation:
Faculty of Sciences, Department of Biology, Çanakkale Onsekiz Mart University, Çanakkale, Türkiye
*
Corresponding author: Hakan Ayyıldız; Email: ayyildizhakan@gmail.com
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Abstract

This study aims to determine the age and growth of Anguilla anguilla from Lake Bafa, Türkiye. A total of 128 samples of European eel were purchased from a small-scale fisherman who caught them in Lake Bafa in November 2016 and 2017, using 34-mm mesh size and 15-m-long fyke nets. The total length (TL) and total weight were measured, and the sex, age, and life stage were identified. The mean TL for females was 54.1 ± 10.1 (36.1–76.2) cm, and for males 43.6 ± 3.7 (35.7–47.8) cm. Yellow and silver eel mean TLs were 48.9 ± 6.6 (35.7–63.7) and 61.9 ± 10.8 (39.9–77.2) cm, respectively, and for pooled data 53.3 ± 10.3 (35.7–77.2) cm. The growth for pooled samples was positive allometric. The age of eels varied from 2 to 9 years. The Von Bertalanffy growth parameters for pooled specimens were determined as L∞ = 71.9 cm, K = 0.25, and t0 = −0.11. The sex ratio (M:F = 1:11.2) was biased in favour of females. It is inferred from this and other studies that eels in Türkiye have comparable length and age distributions in similar habitats.

Keywords

age and growthAnguilla anguillaendangered speciesEuropean eelLake Bafaotolith

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Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 105 , 2025 , e95
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom.

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Footnotes

This article was originally published with an incorrect author affiliation. This has now been updated.

References

Abdalhamid, AH, Ramadan, AA, Mohamed, E, Sayed, MA and Elawad, AN (2018) Study of some ecological and biological parameters on European eel Anguilla anguilla in Umm Hufayan brackish lagoon, Eastern Libya Mediterranean Sea. Bulletin de l’Institut Scientifique, Rabat 40, 23–30.Google Scholar
Acou, A, Lefebvre, F, Contournet, P, Poizat, G, Panfili, J and Crivelli, AJ (2003) Silvering of female eels (Anguilla anguilla) in two sub-populations of the Rhone Delta. Bulletin Français de la Pêche Et de la Pisciculture 368, 55–68. doi:10.1051/kmae:2003036CrossRefGoogle Scholar
Aprahamian, MW (1986) Eel (Anguilla anguilla L.) production in the river Severn, England. Polskie Archiwum Hydrobiologii 33(3/4), 373–389.Google Scholar
Aprahamian, MW (1988) Age structure of eel, Anguilla anguilla (L.), populations in the River Severn, England, and the River Dee, Wales. Aquaculture Research 19(4), 365–376. doi:10.1111/j.1365-2109.1988.tb00586.xCrossRefGoogle Scholar
Ardizzone, GD and Corsi, F (1985) Eel population structure, dynamics and fishing yield in a Mediterranean coastal lagoon. Oebalia 11(2), 547–560.Google Scholar
Balkan, Eİ and Yalçın Özdilek, Ş (2018). Some Biometric Characteristics of Anguilla anguilla from Karamenderes River Delta, Lakes of Gala and Bafa in Turkey. II. In: International Fisheries Symposium, Girne, Turkish Repuplic of Northern Cyprus.Google Scholar
Barcala, E, Romero, D, Bulto, C, Boza, C, Peñalver, J, María-Dolores, E and Muñoz, P (2022) An endangered species living in an endangered ecosystem: Population structure and growth of European eel Anguilla anguilla in a Mediterranean coastal lagoon. Regional Studies in Marine Science 50, 102163. doi:10.1016/j.rsma.2022.102163CrossRefGoogle Scholar
Beamish, RJ and Fournier, DA (1981) A method for comparing the precision of a set of age-determinations. Canadian Journal of Fisheries and Aquatic Sciences 38(8), 982–983. doi:10.1139/f81-132CrossRefGoogle Scholar
Bertignac, M and de Pontual, H (2007) Consequences of bias in age estimation on assessment of the northern stock of European hake (Merluccius merluccius) and on management advice. Ices Journal of Marine Science 64(5), 981–988. doi:10.1093/icesjms/fsm039CrossRefGoogle Scholar
Boulenger, C, Acou, A, Trancart, T, Crivelli, AJ and Feunteun, E (2015) Length–weight relationships of the silver European eel, Anguilla anguilla (Linnaeus, 1758), across its geographic range. Journal of Applied Ichthyology 31(2), 427–430. doi:10.1111/jai.12685CrossRefGoogle Scholar
Bradford, MJ (1991) Effects of Aging Errors on Recruitment Time-Series Estimated from Sequential Population Analysis. Canadian Journal of Fisheries and Aquatic Sciences 48(4), 555–558. doi:10.1139/f91-070CrossRefGoogle Scholar
Chang, WYB (1982) A statistical-method for evaluating the reproducibility of age-determination. Canadian Journal of Fisheries and Aquatic Sciences 39(8), 1208–1210. doi:10.1139/f82-158CrossRefGoogle Scholar
Daverat, F, Beaulaton, L, Poole, R, Lambert, P, Wickström, H, Andersson, J,* Aprahamian, M, Hizem, B, Elie, P, Yalçın Özdilek, S and Gumus, A (2012) One century of eel growth: Changes and implications. Ecology of Freshwater Fish 21(3), 325–336. doi:10.1111/j.1600-0633.2011.00541.xCrossRefGoogle Scholar
Dekker, W (2000) The fractal geometry of the European eel stock. ICES Journal of Marine Science 57(1), 109–121. doi:10.1006/jmsc.1999.0562CrossRefGoogle Scholar
Dekker, W (2003) On the distribution of the European eel (Anguilla anguilla) and its fisheries. Canadian Journal of Fisheries and Aquatic Sciences 60(7), 787–799. doi:10.1139/f03-066CrossRefGoogle Scholar
De Leo, GA and Gatto, M (1996) A size and age-structured model of the European eel (Anguilla anguilla L.). Oceanographic Literature Review 6(43), 610.Google Scholar
Demirci, S, Akar, Ö, Şimşek, E, Demirci, A and Yalçın Özdilek, Ş (2020) Biological parameters and current status of European eel (Anguilla anguilla Linnaeus, 1758) from Asi River, Northeastern Mediterranean region, Turkey. Journal of Applied Ichthyology 36(6), 918–923. doi:10.1111/jai.14145CrossRefGoogle Scholar
Durif, C, Guibert, A and Elie, P (2009) Morphological discrimination of the silvering stages of the European eel. American Fisheries Society Symposium 58, 103–111.Google Scholar
Durif, CM, Dufour, S and Elie, P (2006) Impact of silvering stage, age, body size and condition on reproductive potential of the European eel. Marine Ecology Progress Series 327, 171–181. doi:10.3354/meps327171CrossRefGoogle Scholar
Erdoğan, S (2011) A chemical reaction to a physical impact: Lake Bafa wetland ecosystem (Turkey) case. Ankara Üniversitesi Çevrebilimleri Dergisi 3(1), 1–8. doi:10.1501/Csaum_0000000040CrossRefGoogle Scholar
Fernandez‐Delgado, C, Hernando, JA, Herrera, M and Bellido, M (1989) Age and growth of yellow eels, Anguilla anguilla, in the estuary of the Guadalquivir river (south‐west Spain). Journal of Fish Biology 34(4), 561–570. doi:10.1111/j.1095-8649.1989.tb03335.xCrossRefGoogle Scholar
Geldiay, R and Balık, S (1996) Freshwater Fishes of Turkey. Bornova, Izmir:Ege University Press, 519 pp.Google Scholar
Holmgren, K and Mosegaard, H (1996) Implications of individual growth status on the future sex of the European eel. Journal of Fish Biology 49(5), 910–925. doi:10.1111/j.1095-8649.1996.tb00089.xCrossRefGoogle Scholar
ICES (2009) Workshop on Age Reading of European and American Eel (WKAREA). 66.Google Scholar
IUCN (2024) The IUCN Red List of Threatened Species. Version 2024-1. International Union for Conservation of Nature. https://www.iucnredlist.orgGoogle Scholar
İlhan, A, İlhan, D and Hammed, RO (2020) Comparisons of Morphometric Characteristics and Length-Weight Relationship of European Eel (Anguilla anguilla L., 1758) in Turkish Inland Waters. Egyptian Journal of Zoology 74(74), 13–21. doi:10.12816/ejz.2020.29177.1030CrossRefGoogle Scholar
Jones, CM (1992) Development and application of the otolith increment technique. In Stevenson, DK and Campana, SE (eds), Otolith Microstructure Examination and Analysis. vol. 117, Canadian Special Publication of Fisheries and Aquatic Sciences, 1–11.Google Scholar
Kanjuh, T, Mrdak, D, Piria, M, Tomljanović, T, Joksimović, A, Talevski, T and Milošević, D (2018) Relationships of otolith dimension with body length of European eel Anguilla anguilla (Linnaeus, 1758) from Adriatic catchment of Montenegro. Acta Adriatica 59(1), 91–96. doi:10.32582/aa.59.1.7CrossRefGoogle Scholar
Kasımoğlu, C (2014) The effect of fish size, age and condition factor on the contents of seven essential elements in Anguilla anguilla from Tersakan Stream Mugla (Turkey). Journal of Pollution Effects & Control 2(2), 1–6. doi:10.4172/2375-4397.1000123CrossRefGoogle Scholar
Kasparek, M (1988) Der Bafasee, Natur Und Geschichte in der Türkischen Ägäis. Heidelberg: Max Kasparek Verlag, Heidelberg, 174.Google Scholar
Koutrakis, ET and Tsikliras, AC (2003) Length–weight relationships of fishes from three northern Aegean estuarine systems (Greece). Journal of Applied Ichthyology 19(4), 258–260. doi:10.1046/j.1439-0426.2003.00456.xCrossRefGoogle Scholar
Koyuncu, CE, Kaya, D, Özer, S, Barış, M and Genç, E (2017) Infection status of Anguillicoloides crassus in wild European eels (Anguilla anguilla) from Four Rivers of the Northeast Mediterranean Region, Turkey. Acta Biologica Turcica 30(4), 152–156.Google Scholar
Melia, P, Bevacqua, D, Crivelli, AJ, De Leo, GA, Panfili, J and Gatto, M (2006) Age and growth of Anguilla anguilla in the Camargue lagoons. Journal of Fish Biology 68(3), 876–890. doi:10.1111/j.0022-1112.2006.00975.xCrossRefGoogle Scholar
Miller, SJ and Storck, T (1982) Daily growth rings in otoliths of young-of-the-year largemouth bass. Transactions of the American Fisheries Society 111(4), 527–530. doi:10.1577/1548-8659(1982)111<527:DGRIOO>2.0.CO;22.0.CO;2>CrossRefGoogle Scholar
Moreno‐Valcárcel, R, Oliva‐Paterna, FJ, Arribas, C and Fernández‐Delgado, C (2012) Length–weight relationships for 13 fish species collected in the Doñana marshlands (Guadalquivir estuary, SW Spain). Journal of Applied Ichthyology 28(4), 663–664. doi:10.1111/j.1439-0426.2012.01933.xCrossRefGoogle Scholar
Moriarty, C (1987). Factors influencing recruitment of the Atlantic species of anguillid eels. In American Fisheries Society Symposium (Vol. 1, No. 483, p. 91).Google Scholar
Moriarty, C and Dekker, W (1997) Management of the European eel. Fisheries Bulletin, Marine Institute 15, 59 p.Google Scholar
Panfili, J, Ximénès, MC and Crivelli, AJ (1994) Sources of variation in growth of the European eel (Anguilla anguilla) estimated from otoliths. Canadian Journal of Fisheries and Aquatic Sciences 51(3), 506–515. doi:10.1139/f94-053CrossRefGoogle Scholar
Piria, M, Šprem, N, Tomljanović, T, Slišković, M, Jelić Mrčelić, G and Treer, T (2014) Length weight relationships of the European eel Anguilla anguilla (linnaeus, 1758) from six karst catchments of the Adriatic basin, Croatia. Croatian Journal of Fisheries: Ribarstvo 72(1), 32–35. doi:10.14798/72.1.704CrossRefGoogle Scholar
Poole, WR and Reynolds, JD (1996) Growth rate and age at migration of Anguilla anguilla. Journal of Fish Biology 48(4), 633–642. doi:10.1111/j.1095-8649.1996.tb01458.xGoogle Scholar
Poole, WR, and Reynolds, JD (1998) Variability in growth rate in European eel Anguilla anguilla (L.) in a western Irish catchment. Biology and Environment: Proceedings of the Royal Irish Academy 98B, No. 3, 141–145.Google Scholar
Rad, F (2013) Preliminary Investigation on Morphometric and Biometric Characteristics of Female Silver and Yellow, Anguilla anguilla, from Eastern Mediterranean (Göksu Delta/Turkey). Journal of FisheriesSciences. Com 7(3), 253–265. doi:10.3153/jfscom.2013027Google Scholar
Rossi, R and Cannas, A (1984) Eel fishing management in a hypersaline lagoon of southern Sardinia. Fisheries Research 2(4), 285–298. doi:10.1016/0165-7836(84)90031-6CrossRefGoogle Scholar
Rossi, R and Colombo, G (1976) Sex ratio, age and growth of silver eels in two brackish lagoons in the northern Adriatic (Valli di Comacchio and Valle Nuova). Archivio Di Oceanografia E Limnologia 18, 227–310.Google Scholar
Salman, MA, Özaydin, O, Akalin, S and Yokeş, MB (2017) Gediz Deltası Sulak Alanında (Ege Denizi) Yılan Balığının (Anguilla anguilla) Biyolojisi. TUBITAK.Google Scholar
Secor, DH, Dean, JM and Laban, EH (1991) Manual for Otolith Removal and Preparation for Microstructural Examination: belle W. Baruch Institute for Marine Biology and Coastal Research., Technical Publication. 85 pp.Google Scholar
Silm, M, Bernotas, P, Haldna, M, Jarvalt, A and Noges, T (2017) Age and growth of European eel, Anguilla anguilla (Linnaeus, 1758), in Estonian lakes. Journal of Applied Ichthyology 33(2), 236–241. doi:10.1111/jai.13314CrossRefGoogle Scholar
Simon, J (2015) Age and growth of European eels (Anguilla anguilla) in the Elbe River system in Germany. Fisheries Research 164, 278–285. doi:10.1016/j.fishres.2014.12.005CrossRefGoogle Scholar
Sukatar, A, Ertaş, A, Gülle, İ and Kızılkaya, İT (2020) Trophic state assessment of brackish Bafa Lake (Turkey) based on community structure of zooplankton. Journal of Limnology and Freshwater Fisheries Research 6(2), 88–99. doi:10.17216/LimnoFish.680070CrossRefGoogle Scholar
Tahri, M and Panfili, J (2023) 13‐year population survey of the critically endangered European eel in the southern Mediterranean region (Algeria). Journal of Fish Biology. doi:10.1111/jfb.15396CrossRefGoogle ScholarPubMed
Tesh, F. W. (1977). The Eel: biology and Management of Anguillid Eels. London: Chapmann and Hall, 445 p.CrossRefGoogle Scholar
Vitale, F., Worsøe Clausen, L., & Ní Chonchúir, G. (2019). Handbook of fish age estimation protocols and validation methods. ICES Cooperative Research Report, no. 346, 180.Google Scholar
Vøllestad, LA (1985) Age determination and growth of yellow eels, Anguilla anguilla (L.), from a brackish water, Norway. Journal of Fish Biology 26(5), 521–525. doi:10.1111/j.1095-8649.1985.tb04292.xCrossRefGoogle Scholar
Vøllestad, LA (1992) Geographic variation in age and length at metamorphosis of maturing European eel: Environmental effects and phenotypic plasticity. Journal of Animal Ecology, 41–48. doi:10.2307/5507CrossRefGoogle Scholar
Vøllestad, LA and Jonsson, B (1986) Life‐history characteristics of the European eel Anguilla anguilla in the Imsa River, Norway. Transactions of the American Fisheries Society 115(6), 864–871. doi:10.1577/1548-8659(1986)115<864:LCOTEE>2.0.CO;22.0.CO;2>CrossRefGoogle Scholar
Von Bertalanffy, L. (1938). A quantitative theory of organic growth (inquiries on growth laws. II). Human Biology, 10(2), 181-213.Google Scholar
Yalçın Özdilek, Ş. (2016). The European Eel In Turkey. In Turan, C., Salihoğlu, B., Özgür Özbek, E. and Öztürk, B. (eds) The Turkish Part of the Mediterranean Sea Marine Biodiversity, Fisheries, Conservation and Governance. İstanbul: Türk Deniz Araştırmaları Vakfı (Turkish Marine Research Foundation), 407-424.Google Scholar
Yalçın Özdilek, Ş., Balkan, E.İ., Yalım, B., Emre, Y., Küçük, F., Akın, Ş., Güçlü, S.S., Yağcı, A., Kaymak, N., Kurtoğlu, A., Toslak, C., & Özbolat, A. (2018). Some Biometric Characteristics of Anguilla anguilla in Köyceğiz Lagoon System in Turkey. II. International Fisheries Symposium, Girne, Turkish Republic of Northern Cyprus.Google Scholar
Yalçın Özdilek, Ş., Gümüş, A., & Dekker, W. (2006). Growth of European eel in a Turkish river at the southern-eastern limit of its distribution. The Bulletin of the European Ichthyological Society, 2(2), 55-64.Google Scholar
Yalçın Özdilek, Ş and Özdilek, HG (2020) Assessment of the Annual European eel (Anguilla anguilla Linnaeus, 1758) Catches in three suggested major monitoring areas to support the development of eel fishery management system in Turkey. Journal of Applied Ichthyology 36(6), 924–931. doi:10.1111/jai.14136CrossRefGoogle Scholar
Yerli, S (1991) Köycegiz Lagün Sistemindeki Anguilla anguilla (Linnaeus, 1758) Stoklari Üzerine Incelemeler. Journal of Veterinary and Animal Sciences 15, 241–262.Google Scholar
Zar, JH (1984) Biostatistical Analysis, 2. Englewood Cliffs, NJ, USA: Prentice-Hall, Inc, 718 pp.Google Scholar