TY  - JOUR
T1  - Effect of twine thickness on size selectivity and catch efficiency of gillnets used in Prussian carp (Carassius gibelio) fisheries
TT  - Sade uzatma ağlarında farklı ip kalınlığındaki sade ağ kullanımının gümüşi havuz balığı (Carassius gibelio) avcılığında boy seçiciliği ve av verimi üzerindeki etkileri
AU  - Ateşşahin, Tuncay
AU  - Cilbiz, Mehmet
AU  - İlhan, Mahmut
PY  - 2026
DA  - February
Y2  - 2025
DO  - 10.12714/egejfas.43.1.04
JF  - Ege Journal of Fisheries and Aquatic Sciences
JO  - EgeJFAS
PB  - Ege Üniversitesi
WT  - DergiPark
SN  - 2148-3140
SP  - 29
EP  - 40
VL  - 43
IS  - 1
LA  - en
AB  - This study evaluated the effects of twine thickness and mesh size on the size selectivity and catch efficiency of gillnets used to control the invasive Prussian carp, Carassius gibelio (Bloch, 1782) population in the Karakaya Dam Lake, Türkiye. A total of 1.675 individuals ranging from 17.0 to 31.2 cm in length were captured. Among the tested configurations, the gillnet with 84 mm mesh size and 0.23 mm twine thickness demonstrated the highest catch efficiency, accounting for 50.4% of the total catch, whereas the 76 mm mesh with 0.18 mm twine yielded only 17.9%. Statistical analysis confirmed that mesh size significantly influenced the average length of captured fish (p < 0.05), with larger mesh sizes capturing longer individuals. Seasonal variation was notable, with peak catches observed in December (375 specimens) and January (316 specimens), aligning with the winter schooling behaviour of the species that enhances catchability. The SELECT method was used to model size selectivity, and the lognormal model provided the best fit across all twine thicknesses. Modal lengths of 20.59 cm (0.23 mm), 20.97 cm (0.20 mm), and 21.64 cm (0.18 mm) were estimated, indicating minimal variation due to twine thickness. Although twine thickness did not significantly affect selectivity, it enhanced catch efficiency, particularly for larger individuals. These findings suggest that gillnets with thicker twine and larger mesh sizes are more effective for managing C. gibelio populations, especially during winter months. Moreover, the use of durable gear contributes to reduced gear loss and increased operational lifespan, supporting the socioeconomic sustainability of local fisheries. This research provides a scientific foundation for developing seasonally optimized and gear-specific strategies for managing invasive species in Turkish inland waters.
KW  - Invasive species management
KW  - catch efficiency
KW  - gillnet selectivity
KW  - twine thickness
N2  - Bu çalışmada, Karakaya Baraj Gölü'ndeki (Malatya, Türkiye) istilacı gümüşi havuz balığı, Carassius gibelio (Bloch, 1782) popülasyonun avcılık ile kontrol edilebilmesine yönelik olarak, farklı ip kalınlığı ve ağ göz açıklığındaki sade uzatma ağı kullanımının avın boy seçiciliği ve verimliliği üzerindeki etkileri araştırılmıştır. Çalışmada 17,0-31,2 cm toplam boy aralığında 1.675 birey yakalanmıştır. Test edilen konfigürasyonlar arasında, 84 mm ağ gözü açıklığına ve 0,23 mm ip kalınlığına sahip sade ağ, toplam avın %50,4'ünü oluşturarak en yüksek av verimliliğini göstermiş; buna karşın 76 mm ağ gözü açıklığına ve 0,18 mm ip kalınlığına sahip ağ yalnızca %17,9 verim sağlamıştır. İstatistiksel analiz, ağ gözü açıklığının yakalanan balıkların ortalama uzunluğunu önemli ölçüde etkilediğini (p<0,05) ve daha büyük ağ gözü açıklıklarının daha uzun bireyleri yakaladığını doğrulamıştır. Mevsimsel farklılık dikkat çekici olup, en yüksek av Aralık (375 örnek) ve Ocak (316 örnek) aylarında elde edilmiştir. Bu durum, türün avlanabilirliğini artıran kış dönemi sürü oluşturma davranışı ile uyumludur. Ağların boy seçiciliğinin modellenmesinde SELECT yöntemi kullanılmış ve lognormal model, tüm ip kalınlıkları için en iyi uyumu sağlamıştır. İp kalınlığından kaynaklanan minimum varyasyonu gösteren model uzunluklar sırasıyla 20,59 cm (0,23 mm), 20,97 cm (0,20 mm) ve 21,64 cm (0,18 mm) mm olarak tahmin edilmiştir. İp kalınlığı seçiciliği önemli ölçüde etkilemese de, özellikle daha büyük bireyler için av verimliliğini artırmıştır. Bu bulgular, daha kalın ipli ve daha büyük ağ gözü açıklığına sahip sade ağların, özellikle kış aylarında C. gibelio popülasyonlarını avlamada daha etkili olduğunu göstermiştir. Ayrıca, dayanıklı av araçlarının kullanılması, av aracı kaybının azalmasına ve operasyonel ömrün uzamasına katkıda bulunarak yerel balıkçılığın sosyoekonomik sürdürülebilirliğini desteklemektedir. Bu araştırma, Türkiye iç sularındaki istilacı türlerin yönetimi için mevsime göre optimize edilmiş ve av aracına özgü stratejiler geliştirilmesi adına bilimsel bir temel sunmaktadır.
CR  - Ateşşahin, T., & Dürrani, Ö. (2023). Effects of hook size and bait type on the size selectivity and short-time post-release mortality of a cyprinid fish (Cyprinus carpio L.) in recreational fisheries. Fisheries Research, 261, 106640. https://doi.org/10.1016/j.fishres.2023.106640
CR  - Ayaz, A., Altinagac, U., Ozekinci, U., Ozen, O., Altin, A., & Ismen, A. (2011). Effect of twine thickness on selectivity of gillnets for bogue, Boops boops, in Turkish waters. Mediterranean Marine Science, 12(2), 358–368.
CR  - Aydın, E. (2021). İstilacı Gümüşi Havuz Baliğinin (Carassius gibelio Bloch, 1782) Sakarya İlindeki İçsu Balıkçılığına Etkisinin Araştırılması. Doctoral dissertation, Atatürk Üniversitesi. Türkiye.
CR  - Aydın, C., Cilbiz, M., İlhan, A., & Sari, H.M. (2018). Gillnet and trammel net selectivity for Prussian carp (Carassius gibelio) in Marmara Lake, (Turkey). Ege Journal of Fisheries and Aquatic Sciences, 35, 79–87. https://doi.org/10.12714/egejfas.2018.35.1.13
CR  - Balık, I., Özkök, R., Çubuk, H., & Uysal, R. (2004). Investigation of some biological characteristics of the silver crucian carp, Carassius gibelio (Bloch 1782) population in Lake Eǧirdir. Turkish Journal of Zoology, 28(1), 19–28.
CR  - Brinkhof, I., Herrmann, B., Larsen, R. B., Brinkhof, J., Grimaldo, E., & Vollstad, J. (2023). Effect of gillnet twine thickness on capture pattern and efficiency in the Northeast-Arctic cod (Gadus morhua) fishery. Marine Pollution Bulletin, 191, 114927. https://doi.org/https://doi.org/10.1016/j.marpolbul.2023.114927
CR  - Cerbule, K., Herrmann, B., Grimaldo, E., Grimsmo, L., & Vollstad, J. (2021). The effect of white and green LED-lights on the catch efficiency of the Barents Sea snow crab (Chionoecetes opilio) pot fishery. Plos One, 16(10), e0258272. https://doi.org/10.1371/journal.pone.0258272
CR  - Cilbiz, M., & Ateşşahin, T. (2024). An overview of gillnet and trammel net size selectivity in the Turkish inland fisheries. Aquatic Sciences and Engineering, 39(3), 189–199. https://doi.org/10.26650/ASE20231388644
CR  - Cilbiz, M., Çinar, Ş., Cilbiz, N., Çapkın, K., & Ceylan, M. (2014a). Monofilament gill net and trammel net selectivity for the silver crucian carp (Carassius gibelio Bloch, 1782) in the Eğirdir Lake, Isparta-Turkey. Iranian Journal of Fisheries Sciences, 13(4), 967–978.
CR  - Cilbiz, M., Hanol, Z., Cilbiz, N., Çınar, Ş., & Savaşer, S. (2014b). Multifilament Gillnet and Trammel Net Selectivity for the Silver Crucian Carp (Carassius gibelio Bloch, 1782) in Eğirdir Lake, Isparta, Turkey. Turkish Journal of Fisheries  and  Aquatic  Sciences, 14(4), 905 913. https://doi.org/10.4194/1303-2712-v14_4_09
CR  - Çiçek, E., Fricke, R., Sungur, S., & Eagderi, S. (2018). Endemic freshwater fishes of Turkey. FishTaxa, 3(4), 1-39.
CR  - Dereli, H., Bayhan, B., & Ölçek, Z.S. (2021). The life history of the non-native cyprinid fish Carassius gibelio (Bloch, 1782) from Demirköprü Reservoir in the Aegean Region in Turkey. North-Western Journal of Zoology, 17(2), 187–195.
CR  - Dürrani, Ö., Ateşşahin, T., Eroğlu, M., & Düşükcan, M. (2023). Morphological variations of an invasive cyprinid fish (Carassius gibelio) in lentic and lotic environments inferred from the body, otolith, and scale shapes. Acta Zoologica, 104(3), 458-472. https://doi.org/10.1111/azo.12431
CR  - Efron, B. (1982). The Jackknife, the Bootstrap and Other Resampling Plans. CBMS-NSF Regional Conference Series in Applied Mathematics, Monograph 38, SIAM, Philadelphia. https://doi.org/10.1137/1.9781611970319
CR  - Erdem, Y., Samur, M., & Özdemir, S. (2014). Effectiveness of selective fishing methods on struggle against invasive fish species in inland waters. Aquatic Sciences and Engineering, 29(2), 49-63.
CR  - Ergüden, S.A. (2015). Age and growth properties of prussian carp, Carassius gibelio (Bloch, 1782) living in the middle basin of Seyhan River in Adana, Turkey. Pakistan Journal of Zoology, 47(5), 1365–1371.
CR  - Fakıoğlu, Y.E., Gökçe, G., Özbilgin, H., Cerbule, K., & Herrmann, B. (2023). Impact of ground gear design on catch efficiency in demersal trawl fishery. Regional  Studies  in  Marine  Science, 61, 102852. https://doi.org/10.1016/j.rsma.2023.102852
CR  - Ferro, R.S.T., Özbilgin, H., & Breen, M. (2008). The potential for optimizing yield from a haddock trawl fishery using seasonal changes in selectivity, population structure and fish condition. Fisheries Research, 94(2), 151–159. https://doi.org/10.1016/j.fishres.2008.08.018
CR  - Herrmann, B., Sistiaga, M.B., Nielsen, K.N., & Larsen, R.B. (2012). Understanding the size selectivity of redfish (Sebastes spp.) in North Atlantic trawl codends. Journal of Northwest Atlantic Fishery Science, 44(1), 13. https://doi.org/10.2960/J.v44.m680
CR  - Herrmann, B., Sistiaga, M., Rindahl, L., & Tatone, I. (2017). Estimation of the effect of gear design changes on catch efficiency: methodology and a case study for a spanish longline fishery targeting hake (Merluccius merluccius). Fisheries  Research, 185, 153 160. http://dx.doi.org/10.1016/J.FISHRES.2016.09.013
CR  - Jaureguizar, A.J., De Wysiecki, A.M., Camiolo, M.D., & Luz Clara, M. (2021). Inter-annual fluctuation in the population structure of an estuarine fish: Influence of environmental drivers. Journal of Marine Systems, 218, Article 103526. https://doi.org/10.1016/j.jmarsys.2021.103526
CR  - Kirankaya, S.G., & Ekmekçi, F.G. (2013). Life-history traits of the invasive population of Prussian carp, Carassius gibelio (Actinopterigi: Cypriniformes: Cyprinidae), from Gelingüllü reservoir, Yozgat, Turkey. Acta  Ichthyologica  et  Piscatoria, 43(1), 31 40. https://doi.org/10.3750/AIP2013.43.1.05
CR  - Leonardos, I.D., Tsikliras, A.C., Eleftheriou, V., Cladas, Y., Kagalou, I., Chortatou, R., & Papigioti, O. (2008). Life history characteristics of an invasive cyprinid fish (Carassius gibelio) in Chimaditis Lake (northern Greece). Journal of Applied Ichthyology, 24(2), 213–217. https://doi.org/10.1111/j.1439-0426.2007.01031.x
CR  - Licht, M., Kriwet, J., & Buchwitz, M. (2015). Body-size variation of pycnodontiform fishes from the Late Jurassic of Lower Saxony (Northern Germany) as a consequence of interspecific competition? Palaontologische  Zeitschrift, 89(4), 891 900. https://doi.org/10.1007/s12542-015-0258-4
CR  - Lomeli, M.J.M., Groth, S.D., Blume, M.T.O., Herrmann, B., & Wakefield, W.W. (2020). The efficacy of illumination to reduce bycatch of eulachon and ground fishes before trawl capture in the eastern North Pacific Ocean shrimp fishery. Canadian Journal of Fisheries and Aquatic Sciences, 77(1), 44-54. https://doi.org/10.1139/cjfas-2018-0497
CR  - Lomeli, M.J.M., Wakefield, W.W., Herrmann, B., Dykstra, C.L., Simeon, A., Rudy, D.M., & Planas, J.V. (2021). Use of artificial illumination to reduce Pacific halibut bycatch in a U.S. West Coast groundfish Bottom trawl. Fisheries  Research, 233, 105737. https://doi.org/10.1016/j.fishres.2020.105737
CR  - Merciai, R., Molons-Sierra, C., Sabater, S., & García-Berthou, E. (2017). Water abstraction affects abundance, size structure and growth of two threatened cyprinid fishes. PLOS ONE, 12(4), Article e0175932. https://doi.org/10.1371/journal.pone.0175932
CR  - Millar, R.B. (1992). Estimating the size-selectivity of fishing gear by conditioning on the total catch. Journal of the American Statistical Association, 87(420), 962-968. https://doi.org/10.2307/2290632
CR  - Millar, R.B. (2015). R Code for fitting SELECT models to gillnet data. In: Department of Statistics, University of Auckland, New Zealand. Retrieved from https://www.stat.auckland.ac.nz/~millar/selectware/R/gillnets/ (Accessed: April 19, 2022).
CR  - Millar, R.B. (2017). R Code for fitting SELECT models to gillnet data. In: Department of Statistics, University of Auckland, New Zealand. Retrieved from https://www.stat.auckland.ac.nz/~millar/selectware/RNext/ (Accessed: April 19, 2022).
CR  - Millar, R.B., & Fryer, R.J. (1999). Estimating the size-selection curves of towed gears, traps, nets and hooks. Reviews in Fish Biology and Fisheries, 9(1), 89-116. https://doi.org/10.1023/A:1008838220001
CR  - Millar, R.B., & Holst, R. (1997). Estimation of gillnet and hook selectivity using log-linear models. ICES Journal of Marine Science, 54(3), 471-477. https://doi.org/10.1006/jmsc.1996.0196
CR  - Park, H.-H., Millar, R.B., Bae, B.-S., An, H.-C., Chun, Y.Y., Yang, J.H., & Yoon, S.C. (2011). Size selectivity of Korean flounder (Glyptocephalus stelleri) by gillnets and trammel nets using an extension of SELECT for experiments with differing mesh sizes. Fisheries Research, 107(1–3), 196-200. https://doi.org/10.1016/j.fishres.2010.10.020
CR  - Rytwinski, T., Taylor, J.J., Donaldson, L.A., Britton, J.R., Browne, D.R., Gresswell, R.E., ... & Cooke, S.J. (2019). The effectiveness of non-native fish removal techniques in freshwater ecosystems: a systematic review. Environmental Reviews, 27(1), 71-94.
CR  - Tao, H.H., Chang, C.W., & Hsieh, C.H. (2024). Exploring mechanisms of spatial segregation between body size groups within fish populations under environmental change. Ecography, 2024(3), Article e06730. https://doi.org/10.1111/ecog.06730
CR  - Tarkan, A. S., Copp, G. H., Top, N., Özdemir, N., Önsoy, B., Bilge, G., ... & Sac, G. (2012). Are introduced gibel carp Carassius gibelio in Turkey more invasive in artificial than in natural waters? Fisheries Management and Ecology, 19(2), 178-187. https://doi.org/10.1111/j.1365-2400.2011.00841.x
CR  - Tu, C.Y., Tian, Y., & Hsieh, C.H. (2015). Effects of climate on temporal variation in the abundance and distribution of the demersal fish assemblage in the Tsushima Warm Current region of the Japan Sea. Fisheries  Oceanography, 24(2), 177 189. https://doi.org/10.1111/fog.12101
 
Uysal, R., Alp, A., Yeğen, V., Yağcı, M. A., Çetinkaya, S., Yağcı, A., Bostan, H., Cesur, M., & Küçükkara, R. (2014). İznik Gölü (Bursa/Türkiye)’ndeki gümüşi havuz balığının (Carassius gibelio Bloch, 1782) büyüme özellikleri. Journal of Limnology and Freshwater Fisheries Research, 1(1), 19–27.
UR  - https://doi.org/10.12714/egejfas.43.1.04
L1  - https://dergipark.org.tr/tr/download/article-file/5451915
ER  -