Abstract
Bu çalışma, Van Gölü havzasındaki Erçek Gölü’nde yürütülmüştür. Çalışmada gölde inci kefali (Alburnus tarichi, Güldenstädt, 1814) avcılığında kullanılan multifilament fanyalı uzatma ağlarının seçiciliği incelenmiştir. Araştırmada 22 mm, 24 mm ve 26 mm ağ göz genişliklerine sahip ağlar kullanılarak balık yakalama verimliliği değerlendirilmiştir. Ekim 2021 ile Nisan 2022 tarihleri arasında gerçekleştirilen çalışmada, toplamda 5336 inci kefali yakalanmıştır. 22, 24 ve 26 mm göz genişliğine sahip ağlardan sırasıyla 1296, 1721 ve 2319 adet balık yakalanmıştır. Çalışmanın amacı, inci kefali stokunun sürdürülebilir avcılığına katkı sağlamak için en uygun ağ göz genişliğini belirlemektir. Seçicilik parametrelerinin hesaplanmasında, Holt (1963) metodu kullanılmıştır. Bu metot, balık boyu ve ağ göz açıklığını dikkate alarak ağların hangi boydaki balıkları yakalayabileceğini belirler. Hesaplamalar sonucunda, 26 mm ağ göz genişliğine sahip ağların en yüksek verimliliği sağladığı ve küçük balıkların kaçmasına olanak tanıyarak balık stoklarının korunmasına katkı sunduğu tespit edilmiştir. Çalışma sonucunda, 22, 24 ve 26 mm ağ göz genişliğine sahip ağların optimum yakalama boyları sırasıyla 21,15 cm, 22,47 cm ve 23,69 cm olarak hesaplanmıştır. Özellikle 22 mm ağ göz genişliğine sahip ağların, yasal avlanma boyutunun altında balıkları yakaladığı ve bu durumun stokların sürdürülebilirliğini olumsuz etkileyebileceği belirlenmiştir. Sonuç olarak, 26 mm ağ göz genişliğine sahip ağların Erçek Gölü’nde sürdürülebilir balıkçılık için en uygun seçenek olduğu ortaya konmuştur. Çalışmanın bulguları, inci kefali stoklarının korunması ve sürdürülebilir avcılık yönetimi için önemli veriler sağlamaktadır.
Project Number
FYL-2022-9891
References
- Akkuş, M., & Sarı, M. (2013). A research on estimating of carrying capacity of Lake Erçek with remote sensing method. In L. Ouwehand (Ed.), Proceedings of ESA Living Planet Symposium, European Space Agency, ESTEC, Noordwijk, The Netherlands.
- Aure, C.M., Nyamweya, C.S., Njiru, J.M., Musa, S., Ogari, Z., May, L., & Wakwabi, E. (2019). Exploring the demarcation requirements of fish breeding and nursery sites to balance the exploitation, management, and conservation needs of Lake Victoria ecosystem. Fisheries Management and Ecology, 26(5), 451 459. https://doi.org/10.1111/fme.12368
- Çetinkaya, O., Sarı, M., & Arabacı, M. (1995). A preliminary study on the catch efficiency and selectivity of trammel nets used in the fishing of pearl mullet (Chalcalburnus tarichi, Pallas 1811) in Lake Van, Turkey (in Turkish with English abstract). Ege University Journal of Fisheries and Aquatic Sciences, 12(1-2), 1-13.
- 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
- Çınar, Ş., & Kuşat, M. (2015). Comparison of fishing efficiency of monofilament and multifilament trammel nets in Lake Eğirdir (in Turkish with English abstract). Süleyman Demirel University Journal of Fisheries, 11(2), 20-34. https://doi.org/10.22392/egirdir.246334
- Gündoğdu, S. (2010). A study on the population of pearl mullet in Lake Erçek. Master's thesis, Çukurova University.Adana, Turkey.
- Holt, S.J. (1963). A method for determining gear selectivity and its application. Lisbon, Canada.
- Kocabaş, E., Öztekin, A., Daban, İ.B., & Ayaz, A. (2018). Gillnet selectivity for non target fish species caught by red mullet gillnets north Aegean Sea. Ege Journal of Fisheries and Aquatic Sciences, 35(3), 319-326. https://doi.org/10.12714/egejfas.2018.35.3.12
- Kuşat, M. (1996). A study on the fishing efficiency of multifilament and monofilament trammel nets in pike-perch fishing in Lake Eğirdir. Doctoral dissertation, Ege University, Turkey.
- Langerhans, R.B., Layman, C.A., Langerhans, A.K., & DeWitt, T.J. (2003). Habitat-associated morphological divergence in two Neotropical fish species. Biological Journal of the Linnean Society, 80(4), 689–698. https://doi.org/10.1111/j.1095-8312.2003.00266.x
- Meydan, A.F., & Akkol, S. (2020). Seasonal temperature dynamics of the water column in Lake Erçek, Eastern Anatolia, Turkey (in Turkish with English abstract). Pamukkale University Journal of Engineering Sciences, 26(6), 1148 1153. https://doi.org/10.5505/pajes.2019.64436
- 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/10.1080/01621459.1992.10476250
- Özyurt, C.E., & Yeşilçimen, H.Ö. (2013). Gear mesh size measurement methods and its importance in fisheries management (in Turkish with English abstract). Aquaculture Studies, 3, 21-31. https://doi.org/10.17693/yunusae.v2013i21904.235414
- Pala, K. (2021). Selectivity of multifilament trammel nets with different mesh sizes in Lake Van. Master's thesis, Van Yüzüncü Yıl University, Turkey.
- Sarı, M., & İpek, S. (1998). Determining the bathymetric features of Lake Erçek (in Turkish). TÜBİTAK, Ankara, Turkey, YDABÇAG-609-A.
- Sarı, M., & Tokaç, A. (2000). Comparison of catch efficiency of two different trammel nets used in pearl mullet fishing (in Turkish). Ege University Journal of Fisheries, 17(3-4), 27-33.
- Rosman, G.F., & Maugeri, L. (1980). Selectivity in trammel nets: Influencing factors and applications. Fisheries Research, 12(2), 45-52.
- Von Brandt, A.V. (1975). Enmeshing nets: Gillnets and entangling nets - The theory of their efficiency. In Proceedings of the EIFAC Symposium (pp. 1-43). Aviemore, Scotland.
- Williams, N. (1998). Overfishing disrupts entire ecosystems. Science, 279(5352), 809-809. https://doi.org/10.1126/science.279.5352.809
- Yıldız, Ş. (1997). Monthly and seasonal distributions of zooplankton species in Lake Erçek. Doctoral dissertation, Van Yüzüncü Yıl University, Turkey.
Abstract
This study was conducted in Lake Erçek, located in the Van Lake basin. The study examined the selectivity of multifilament trammel nets used in the fishing of pearl mullet (Alburnus tarichi, Güldenstädt, 1814) in the lake. The efficiency of nets with mesh sizes of 22 mm, 24 mm, and 26 mm was evaluated in the research. A total of 5.336 pearl mullets were caught in the study carried out between October 2021 and April 2022. 1.296, 1.721 and 2.319 fish were caught from nets with mesh sizes of 22. 24 and 26 mm, respectively. The aim of the study was to determine the most suitable mesh size for sustainable pearl mullet fishing in Lake Erçek. The Holt (1963) method was used to calculate the selectivity parameters. This method considers the fish length and mesh size to determine which size of fish can be caught by the nets. The calculations showed that nets with a 26 mm mesh size had the highest efficiency and contributed to the preservation of fish stocks by allowing smaller fish to escape. The optimum catch lengths for the 22 mm, 24 mm, and 26 mm nets were calculated as 21.15 cm, 22.47 cm, and 23.69 cm, respectively. It was particularly noted that nets with a 22 mm mesh size caught fish below the legal catch size, which could negatively affect the sustainability of the fish stocks. As a result, it was concluded that nets with a 26 mm mesh size are the most suitable option for sustainable fishing in Lake Erçek. The findings of the study provide important data for the conservation of pearl mullet stocks and for the sustainable management of fishing practices.
Supporting Institution
This study was financially supported by Van Yüzüncü Yıl University Scientific Research Projects Coordination Unit
Project Number
FYL-2022-9891
References
- Akkuş, M., & Sarı, M. (2013). A research on estimating of carrying capacity of Lake Erçek with remote sensing method. In L. Ouwehand (Ed.), Proceedings of ESA Living Planet Symposium, European Space Agency, ESTEC, Noordwijk, The Netherlands.
- Aure, C.M., Nyamweya, C.S., Njiru, J.M., Musa, S., Ogari, Z., May, L., & Wakwabi, E. (2019). Exploring the demarcation requirements of fish breeding and nursery sites to balance the exploitation, management, and conservation needs of Lake Victoria ecosystem. Fisheries Management and Ecology, 26(5), 451 459. https://doi.org/10.1111/fme.12368
- Çetinkaya, O., Sarı, M., & Arabacı, M. (1995). A preliminary study on the catch efficiency and selectivity of trammel nets used in the fishing of pearl mullet (Chalcalburnus tarichi, Pallas 1811) in Lake Van, Turkey (in Turkish with English abstract). Ege University Journal of Fisheries and Aquatic Sciences, 12(1-2), 1-13.
- 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
- Çınar, Ş., & Kuşat, M. (2015). Comparison of fishing efficiency of monofilament and multifilament trammel nets in Lake Eğirdir (in Turkish with English abstract). Süleyman Demirel University Journal of Fisheries, 11(2), 20-34. https://doi.org/10.22392/egirdir.246334
- Gündoğdu, S. (2010). A study on the population of pearl mullet in Lake Erçek. Master's thesis, Çukurova University.Adana, Turkey.
- Holt, S.J. (1963). A method for determining gear selectivity and its application. Lisbon, Canada.
- Kocabaş, E., Öztekin, A., Daban, İ.B., & Ayaz, A. (2018). Gillnet selectivity for non target fish species caught by red mullet gillnets north Aegean Sea. Ege Journal of Fisheries and Aquatic Sciences, 35(3), 319-326. https://doi.org/10.12714/egejfas.2018.35.3.12
- Kuşat, M. (1996). A study on the fishing efficiency of multifilament and monofilament trammel nets in pike-perch fishing in Lake Eğirdir. Doctoral dissertation, Ege University, Turkey.
- Langerhans, R.B., Layman, C.A., Langerhans, A.K., & DeWitt, T.J. (2003). Habitat-associated morphological divergence in two Neotropical fish species. Biological Journal of the Linnean Society, 80(4), 689–698. https://doi.org/10.1111/j.1095-8312.2003.00266.x
- Meydan, A.F., & Akkol, S. (2020). Seasonal temperature dynamics of the water column in Lake Erçek, Eastern Anatolia, Turkey (in Turkish with English abstract). Pamukkale University Journal of Engineering Sciences, 26(6), 1148 1153. https://doi.org/10.5505/pajes.2019.64436
- 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/10.1080/01621459.1992.10476250
- Özyurt, C.E., & Yeşilçimen, H.Ö. (2013). Gear mesh size measurement methods and its importance in fisheries management (in Turkish with English abstract). Aquaculture Studies, 3, 21-31. https://doi.org/10.17693/yunusae.v2013i21904.235414
- Pala, K. (2021). Selectivity of multifilament trammel nets with different mesh sizes in Lake Van. Master's thesis, Van Yüzüncü Yıl University, Turkey.
- Sarı, M., & İpek, S. (1998). Determining the bathymetric features of Lake Erçek (in Turkish). TÜBİTAK, Ankara, Turkey, YDABÇAG-609-A.
- Sarı, M., & Tokaç, A. (2000). Comparison of catch efficiency of two different trammel nets used in pearl mullet fishing (in Turkish). Ege University Journal of Fisheries, 17(3-4), 27-33.
- Rosman, G.F., & Maugeri, L. (1980). Selectivity in trammel nets: Influencing factors and applications. Fisheries Research, 12(2), 45-52.
- Von Brandt, A.V. (1975). Enmeshing nets: Gillnets and entangling nets - The theory of their efficiency. In Proceedings of the EIFAC Symposium (pp. 1-43). Aviemore, Scotland.
- Williams, N. (1998). Overfishing disrupts entire ecosystems. Science, 279(5352), 809-809. https://doi.org/10.1126/science.279.5352.809
- Yıldız, Ş. (1997). Monthly and seasonal distributions of zooplankton species in Lake Erçek. Doctoral dissertation, Van Yüzüncü Yıl University, Turkey.
Details
| Primary Language | English |
|---|---|
| Subjects | Fisheries Management |
| Journal Section | Articles |
| Authors | |
| Project Number | FYL-2022-9891 |
| Early Pub Date | December 9, 2024 |
| Publication Date | December 11, 2024 |
| Submission Date | October 25, 2024 |
| Acceptance Date | November 28, 2024 |
| Published in Issue | Year 2024Volume: 41 Issue: 4 |