Catch Comparison of Commercial and Experimental Deep Water Cast Nets with Different Mesh Sizes for Whiting (Merlangius merlangus euxinus) Fishery

Year 2020, Volume: 9 Issue: 2, 130 - 135, 31.12.2020

Göktuğ Dalgıç , Mehmet Şaban Kutay Ahmet Raif Eryaşar

https://doi.org/10.33714/masteb.728610

Abstract

In the present study, the commercial (16 mm nominal mesh size) and experimental deep water cast nets with different mesh sizes (20 mm, 24 mm, 28 mm and 32 mm nominal mesh size) were tested to compare the captured fish lengths and catch amounts for whiting (Merlangius merlangus euxinus). Experiments were carried out between July, 11 and August, 29, 2018 in Rize province of the south-eastern Black Sea Region. A commercial fishing boat was chartered for 20-day sea trials and in total, 66 set operations were done for all nets. Generalized Linear Mixed Models (GLMM) was used to compare fish sizes caught with experimental and commercial deep water cast nets. Results showed that more than 70 percent of the individuals caught in cast nets with 16 mm, 20 mm and 24 mm size were below the minimum landing size of whiting (13 cm). Among tested nets, only cast net with 32 mm size caught significantly less individuals under the minimum landing size. Finally, the results obtained from this study are discussed in terms of sustainable fisheries of whiting in the Black Sea.

Keywords

Deep water cast net, Whiting, Catch composition, Black Sea

Supporting Institution

Research Found of the Recep Tayyip Erdoğan University

Project Number

FYL-2018-917

Thanks

This work was supported by Research Found of the Recep Tayyip Erdoğan University. Project Number FYL-2018-917.

References

• Anonymous. (2016a). The commercial fish catching regulations in seas and inland waters in 2016-2020 fishing period: circular No.2016/35 (in Turkish). Ministry of Food, Agriculture and Livestock, General Directorate of Conservation and Inspection, Ankara, Turkey (In Turkish).
• Anonymous. (2016b). The amateur fish catching regulations in seas and inland waters in 2016-2020 fishing period: circular No.2016/36 (in Turkish). Ministry of Food, Agriculture and Livestock, General Directorate of Conservation and Inspection, Ankara, Turkey (In Turkish).
• Emanet, M. & Ayaz, A. (2018). The catching efficiency of deep cast net used for catching whiting (Merlangius merlangus Linnaeus, 1758) in Sürmene coast, Trabzon (Black Sea). Ege Journal of Fisheries and Aquatic Sciences, 35(3): 327-333. https://doi.org/10.12714/ egejfas.2018.35.3.13
• Eryaşar, A. R. & Özbilgin, H. (2015). Implications for catch composition and revenue in changing from diamond to square mesh codends in the north eastern Mediterranean. Journal of Applied Ichthyology, 31(2): 282-289. https://doi.org/10.1111/jai.12643
• Eryaşar, A. R. (2018). A novel grid-net design to eliminate bycatch in beam trawl fishing for the veined rapa whelk in the south-eastern Black Sea. Mediterranean Marine Science, 19(3): 494-503. https://doi.org/10.12681/ mms.15351
• Godoy, H., Furevik, D. & Lokkeborg, S. (2003). Reduced bycatch of red king crab (Paralithodes camtschaticus) in the gillnet fishery for cod (Gadus morhua) in Northern Norway. Fisheries Research, 62(3): 337-384. https://doi.org/10.1016/S0165-7836(02)00281-3
• Holst, R. & Revill, A. (2009). A simple statistical method for catch comparison studies. Fisheries Research, 95: 254-259. https://doi.org/10.1016/j.fishres.2008.09.027
• Kalaycı, F. & Yeşilçiçek, T. (2014). Effects of depth, season and mesh size on the catch and discards of whiting (Merlangius merlangus euxinus) gillnet fishery in the southern Black Sea, Turkey. Turkish Journal of Fisheries and Aquatic Sciences, 14(2): 449-456. https://doi.org/ 10.4194/1303-2712-v14_2_15
• Karadurmuş, U. (2019). Structural-operational properties of deep water cast nets used for whiting and comparison with gill nets. Ph.D. Thesis. Karadeniz Technical University, Trabzon, Turkey. 127p.
• R Development Core Team. (2019). R: A language and environment for statistical computing. R Foundation for statistical Computing, Vienna http://www.rproject.org.
• TurkStat. (2018). Fishery Statistics. Retrieved on April 28, 2018 from http://www.turkstat.gov.tr/
• Zengin, M., Akpınar, İ. Ö., Kaykaç, M. H. & Tosunoğlu, Z. (2019). Comparison of selectivity of the trawl codends for whiting (Merlangius merlangus euxinus) in the Black Sea. Ege Journal of Fisheries and Aquatic Sciences, 36(3): 301-311. https://doi.org/10.12714/egejfas.2019.36.3.11