Recovery potential and management options for European hake, Merluccius merluccius (Linnaeus, 1758), stocks in Turkish waters

Nazli DEMIREL, Güzin GÜL, Ahsen YÜKSEK

Abstract

Overfishing has been a topic of fierce discussion over the past several decades. However, a lack of information regarding fish stocks makes proper stock assessment through good fisheries management difficult. This study addresses a problematic question for declining European hake, Merluccius merluccius (Linnaeus, 1758), stocks in the Turkish Aegean, Mediterranean, and Marmara seas. The present stock status and fisheries reference points were estimated using novel, data-limited assessment methods with recovery potential and management options for European hake stocks under different exploitation scenarios for each sea. Assessment results show that the ratio of the biomass (B) corresponding to the maximum sustainable yield (MSY) (B/BMSY) was under the threshold, and the ratio of fishing mortality (F) corresponding to the MSY (F/FMSY) was over the threshold, indicating that hake stocks were under ongoing overfishing since 2002 in each sea. After that, the biomass values gradually decreased from outside the safe biological limits, under the critical limits of 0.5 BMSY, while fishing mortality continued over the threshold. Reducing the fishing mortality to half of the estimated FMSY could lead to Marmara Sea hake stocks gradually increase in biomass and close to reaching its BMSY. Reducing fishing mortality to its 0.8 FMSY for Aegean Sea stock, and 0.5 FMSY for Mediterranean stock may help rebuild stocks until 2025. However, even the current estimated FMSY (0.95 FMSY is presented as FMSY), cannot assist in rebuilding any European hake stocks in 15 years projection. It is obvious to say that fisheries regulations must be carefully considered and rearranged, especially for depleted stocks such as those of European hake in Turkish waters.

Keywords

Merluccius merluccius; stock assessment; recovery, data-poor stocks; Mediterranean, fisheries management

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References

Abella, A., Ria, M., Mancusi, C. 2010. Assessment of the status of the coastal groundfish assemblage exploited by the Viareggio fleet (Southern Ligurian Sea). Sci. Mar. 74, 793-805.

Akyüz, E. 1959. Unpublished data used by Beverton, R.J.H., Holt, S.J. 1959. A review of the lifespans and mortality rates of fish in nature, and their relation to growth and other physiological characteristics, in: Wolstenholme, G.E.W. and O'Connor, M. (Eds.), CIBA Foundation colloquia on ageing: the lifespan of animals. Vol. 5. J and A Churchill Ltd, Londra, pp 142-180.

Aldebert, Y. Recasens, L. 1996. Comparison of methods for stock assessment of European hake Merluccius merluccius in the Gulf of Lions (Northwestern Mediterranean) Aquat. Living Resour. 9, 13-22, doi: 10.1051/alr:1996003

Aranciaba, H. 2015. Hakes: Biology and exploitation. John Wiley & Sons, Ltd., UK, 350 pp. Online ISBN: 9781118568262

Audzijonyte A., Kuparinen A. 2016. The role of life histories and trophic interactions in population recovery. Cons. Biol. 30: 734–743

Bayhan, Y.K., Çiçek, E., Ünlüer, T., Akkaya, M. 2006. Catch and by-catch composition of the shrimp fishery by beam trawl in the southeastern Marmara Sea. Ege J. F. Aquat. Sci. 23(3), 277-283.

Bensch, A., Gianni, M., Gréboval, D., Sanders, J., Hjort, A. 2009. Worldwide review of bottom fisheries in the high seas. FAO Fisheries and Aquaculture Technical Paper, 522 Rev.1, Rome, 156 pp. ISBN 978-92-5-106403-0

Bilecenoğlu, M., Kaya, M., Cihangir, B., Çiçek, E. 2014. An updated checklist of the marine fishes of Turkey. Turk. J. Zool. 38: 901-929

Caddy, J.F. 2015. Criteria for sustainable fisheries on juveniles illustrated for Mediterranean hake: control the juvenile harvest, and safeguard spawning refugia to rebuild population fecundity Sci. Mar., 79 (2015), pp. 287-299, 10.3989/scimar.04269.09A

Cope, J.M., Punt, A.E. 2009. Length-based reference points for data-limited situations: Applications and Restrictions. Mar. Coast. Fish. 1, 169-186. doi: 10.1577/C08-025.1

Demirel, N., Gül, G. 2016. Demersal fishes and fisheries in the Sea of Marmara, in: Özsoy E., Çağatay M.N., Balkıs N., Balkıs N., Öztürk B. (Eds.), The Sea of Marmara - Marine Biodiversity, Fisheries, Conservation and Governance. Turkish Marine Research Foundation Press, İstanbul, pp.630-643, ISBN 978-975-8825-34-9, 2016.

Demirel, N., Zengin, M., Ulman, A., 2020. First Large-Scale Eastern Mediterranean and Black Sea Stock Assessment Reveals a Dramatic Decline. Front. Mar. Sci. 7, 103. https://doi.org/10.3389/fmars.2020.00103

Deniz-Bök, T., Göktürk D., Kahraman, A.E. 2011. By-catch in 36 and 40 mm PA Turkish twin rigged beam trawl, Afr. J. Biotechnol. 10 (37), 7294-7302.

EU Directive 2008/ 56/EC of the European Parliament and the Council of 17 June 2008 establishing a framework for community action in the field of marine environmental policy (Marine Strategy Framework Directive) Official Journal of the European Union L, 164 (19).

Froese, R., Demirel, N., Coro, G., Kleisner K., Winker, H. 2017. Estimating fisheries reference points from catch and resilience. Fish. Fish., 18, 506-526. doi: 10.1111/faf.12190

Froese, R., Pauly, D. (Eds). 2022. FishBase. World Wide Web electronic publication. www.fishbase.org, version (02/2022).

Froese, R., Winker, H., Coro, G., Demirel, N., Tsikliras, A., Dimarchopoulou, D., Scarcella, G., Quaas, M., Matz-Lück, N. 2018. Status and rebuilding European Fisheries. Mar. Policy. 93, 159-170. doi: 10.1016/j.marpol.2018.04.018

Göktürk, D., Deniz, T., Ateş, C. 2019. Selectivity parameters of European hake gillnets for target and by-catch species with a perspective on small-scale fisheries management in the Sea of Marmara, Turkey. Reg. Stud. Mar. Sci. 57, 343-354.

Gözenç, S., Kurter, A., Mater, K.A., Bilecik, N., Adatepe, F.M., Uysal, A., Orhon, S., Kıratlı, N., Gümüş, E., Demirel, S., Yüksek, A., Orhon, V., Çimen, N., Yıldırım, V., Dilek, M., Kamil, Y., Harun, K. 1997. Stock assessment of the demersal fishes in the Sea of Marmara, Final report, TUBITAK DEBAG Project No: 13/g. (in Turkish)

Gücü, C. Bingel, F. 2011. Hake, Merluccius merluccius L., in the northeastern Mediterranean Sea: a case of disappearance. J. Appl. Ichthyol. 27, 1001–1012.

Guillen, J., Macher, C., Merzéréaud, M., Bertignac, M., Fifas, S., Guyader, O. 2013. Estimating MSY and MEY in multi-species and multi-fleet fisheries, consequences and limits: an application to the Bay of Biscay mixed fishery. Mar. Policy. 40, 64-74, https://doi.org/10.1016/j.marpol.2012.12.029.

Hutchings J.A. 2000. Collapse and recovery of marine fishes. Nature, 406: 882-885. https://doi.org/10.1038/35022565

Hutchings, J.A., Reynolds, J.D. 2004. Marine fish population collapses: consequences for recovery and extinction risk. BioScience. 54, 297-309

İşmen, A., Tokaç, A., Önal, U. 2015. Demersal fishes and fisheries in the Aegean Sea, in Katağan, T., Tokaç, A., Beşiktepe, Ş., Öztürk, B. (Eds.) 2015. The Aegean Sea Marine Biodiversity, Fisheries, Conservation and Governance. Turkish Marine Research Foundation (TUDAV), Publication No: 41, Istanbul, Turkey.

JICA. 1993. Report of demersal fisheries resource survey in the Republic of Turkey. Japan International Cooperation Agency.

Kahraman, A.E., Yıldız, T., Uzer, U., Karakulak, F.S., 2017. Sexual maturity and reproductive patterns of European hake Merluccius merluccius (Linnaeus, 1758) (Actinopterygii: Merlucciidae) from the Sea of Marmara, Turkey. Acta. Zool. Bulgar. 69, 385-392.

Khoukh, M., Maynou, F. 2018. Spatial management of the European hake Merluccius merluccius fishery in the Catalan Mediterranean: Simulation of management alternatives with the InVEST model. Sci. Mar. 82S1, 175-188.

Kınacıgil H.T., İlkyaz A.T., Metin G., Ulaş A., Soykan O., Akyol O., Gurbet R. 2008. Determination of the First Maturity Length/Age and Growth Parameters of Demersal Fish Stock in the Aegean Sea from the Fishery Management Point of View. The Scientific and Technological Research Council of Turkey (TUBITAK) Project Number: 103Y132, Ankara (in Turkish).

Kocataş, A., Koray, T., Kaya, M., Kara. Ö.F. 1993. A review of the fishery resources and their environment in the Sea of Marmara. In; Studies and Reviews General Fisheries Council for the Mediterranean, FAO, 64, Roma.

Le Quesne, W., Brown, M., De Oliveira, J., Casey, J., O’Brien, C. 2013. Data-deficient fisheries in EU waters. Directorate- General for Internal Policies, Policy Department B: Structural and Cohesion Policies. Fisheries. IP/B/PECH/IC/2012–118. pp.7

Lleonart, J., Maynou, F., Recasens, L., Franquesa, R. 2003. A bioeconomic model for Mediterranean fisheries, the hake off Catalonia (western Mediterranean) as a case study. Sci. Mar. 67(S1), 337-351, doi: http://dx.doi.org/10.3989/scimar.2003.67s1337.

Martínez-Baños, P., Ramírez, J.G., Demestre, M., Maynou, F. 2018. European hake (Merluccius merluccius) assessment based on size frequencies and basic biological parameters in the SW Mediterranean. Fish. Res. 205, 35-42.

Maynou, F., 2020. Evolution of fishing capacity in a Mediterranean fishery in the first two decades of the 21st c. Ocean. Coast. Manage. https://doi.org/10.1016/j.ocecoaman.2020.105190

Murua, H. 2010. The biology and fisheries of European hake, Merluccius merluccius, in the North-east Atlantic. Adv. Mar. Biol. 58, 97-154.

Narayanakumar, R. 2017. Maximum economic yield and its importance in fishery management, in Course Manual, Summer School on Advanced Methods for Fish Stock Assessment and Fisheries Management, CMFRI Lecture Note Series No.2/2017 ICAR-Central Marine Fisheries Research Institute, 12 July - 1 August, 2017.

Neubauer P., Jensen O.P., Hutchings J.A., Baum J.K. 2013. Resilience and recovery of overexploited marine populations. Science, 340: 347-349.

Okuş, E., Yüksek, A., Uysal, A., Orhon, V. 1997. Stok determination of some teleost fish in the Sea of Marmara. Final report, TÜBİTAK-DEBAG-116/G (in Turkish).

Osio G.C., Gibin, M., Mannini A., Villamor A., Orio A. 2018. The Mediterranean and Black Sea STECF Stock Assessment Database. EUR 29294 EN, Publications Office of the European Union, Luxembourg, ISBN 978-92-79-88954-7, doi:10.2760/559579

Piroddi, C., Colloca, F., Tsikliras, A.C. 2020. The living marine resources in the Mediterranean Sea Large Marine Ecosystem. Environ. Develop. https://doi.org/10.1016/j.envdev.2020.100555

Ratz, H.-J., Charef, A., Abella, A.J., Colloca, F., Ligas, A., Mannini, A., Lloret J. 2013. A medium-term, stochastic forecast model to support sustainable, mixed fisheries management in the Mediterranean Sea. J. Fish. Biol. 83, 921–938

Sinopoli, M., Fanelli, E., D’Anna, G., Badalamenti, F., Pipitone, C. 2012. Assessing the effects of a trawling ban on diet and trophic level of hake, Merluccius merluccius, in the southern Tyrrhenian Sea. Sci. Mar. 76(4), 677-690

Soykan O., Ilkyaz A.T., Metin G., Kınacıgil T.H. 2015. Age, growth and reproduction of European hake (Merluccius merluccius (Linn., 1758)) in the Central Aegean Sea, Turkey. J. Mar. Biol. Assoc. UK. 95, 829–837. https://doi.org/10.1017/S002531541400201X.

Stergiou, K.I., Somarakis, S., Triantafyllou, G., Tsiaras, K.P., Giannoulaki, M., Petihakis, G., Machias, A., Tsikliras, A.C. 2016. Trends in productivity and biomass yields in the Mediterranean large marine ecosystem during climate change. Environ. Dev. 17 (Suppl. 1): 57-74

Tıraşın E.M., Ünlüoğlu A. 2012. Demersal and deep water fisheries resources in the Turkish Seas, in A. Tokaç, A.C. Gücü and B. Öztürk (eds) The State of The Turkish Fisheries. Published by Turkish Marine Research Foundation, Istanbul, Turkey. pp. 28-91.

Torcu-Koç, H., Üstün, F., Erdoğan, Z., Artüz, L. (2012). Species composition of benthic fish fauna in the Sea of Marmara, Turkey. J. Appl. Ichthyol. doi: 10.1111/j.1439-0426.2012.02037.x

Tserpes, G., Nikolioudakis, N., Maravelias, C., Carvalho, N., Merino, G. 2016. Viability and Management Targets of Mediterranean Demersal Fisheries: The Case of the Aegean Sea. PLoS ONE 11(12): e0168694. https://doi.org/10.1371/journal.pone.0168694

Turkstat 2022. Fisheries production statistics for 2020, Ankara, Turkey. Available at www.tuik.gov.tr (accessed 2 February 2022).

Tunca S., Gulec O., Tosunoğlu Z. 2021. Techno-economic efficiencies of the purse-seiners in the Aegean Sea (Eastern Mediterranean, Turkey). Ocean & Coastal Management, 215: 105943. https://doi.org/10.1016/j.ocecoaman.2021.105943

Wang, C.H. 2004. Improvement of the Schaefer model and its application. 15th–SCTB meeting, August 8-18, 2004, Marshall Islands. SCTB-17 working paper, MWG-2,11pp.

Yazıcı, M.F., İşmen, A., Altınağaç, U., Ayaz, A. (2006). A Study on the catch composition of the shrimp fishery by beam trawl in the Sea of Marmara. Ege J. F. Aquat. Sci., 23: 269-275.

Yıldız, T., Ulman, A., Demirel, N. 2020. A comparison of market landings during fish spawning seasons to better understand the effectiveness of the temporal fishery closure in Turkey. Ocean. Coast. Manag. 198: 105353. https://doi.org/10.1016/j.ocecoaman.2020.105353

Zengin, M., Polat, H., Kutlu, S., Dinçer, C., Güngör, H., Aksoy, M., Özgündüz, C., Karaarslan, E., Firidin S. 2004. An investigation on development of deep rose shrimp (Parapenaeus longirostris, Lucas, 1846) fishery in the Sea of Marmara. Central Fisheries Research Institute, Trabzon 149 p.

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