In this study the effects on the discard reduction of guarding net rigged prawn trammel nets were examined with the focus on catch composition and income of fishermen for the Mersin Bay small-scale prawn fishery. A total of 15 fishing trips were carried out between September and December 2011, using the commercial net and the alternative experimental net for comparison. The results revealed that catches of the main target species, green tiger prawn (Penaeus semisulcatus), in the alternative nets were only 1.5% smaller than those of the commercial nets, and with a statistically insignificant difference (P > 0.05). However, the catch of the main discarded species, the invasive swimming crab (Charybdes longicollis), mantis shrimp (Rissoides desmaresti), and the blue crab (Portunus pelagicus) were captured 85%, 66%, 75% less often in the alternative nets, with statistically significant differences (P < 0.05). Also reduced was the labour needed to remove the catch from the alternative gear as well as a reduction in the number of tears in the net. An 8% loss of revenue from landings was estimated when using the alternative gear, however, this difference was statistically not significant (P < 0.05).
Öz: Bu çalışma Nazik Gölü balıkçılık faaliyetlerinin belirlenebilmesi için Eylül-Aralık 2018 tarihleri arasında, aktif olarak çalışan 18 balıkçı ile yüz yüze anket görüşmesi yapılarak gerçekleştirilmiştir. Nazik Gölü'nde balık avcılığında 0,4 donam faktörüyle donatılmış 140 mm ağ göz açıklığına sahip fanyalı uzatma ağlarının kullanıldığı saptanmıştır. Bu ağları kullanan teknelerin ortalama yaşı 12,40±5,04 yıl, ortalama boyu 6,50±1,34 m, ortalama motor yaşı 11,61±3,97 yıl ve ortalama motor gücü 14,11±6,08 BG olarak tespit edilmiştir. Gölde yıllık 55316 kg balık avladığı belirlenmiştir. Teknelerde çalışan tayfaların ortalama sayısı 1,22±0,73 olarak tespit edilmiştir. Tayfaların %83'ünün sürekli %17'sinin ise arada bir, çalıştığı saptamıştır. Balıkçıların %78'inin ilkokul, %22'sinin ortaokul mezunu olduğu belirlenmiştir. Ayrıca çalışan balıkçılar içerisinde lise veya üniversite mezununun olmadığı tespit edilmiştir. Balıkçılık yapanların ortalama yaşının 36,44±10,04 olduğu, %83'ünün evli ve ortalama çocuk sayısının 4,27±2,98 olduğu saptanmıştır. Ayrıca balıkçıların %61'inin balıkçılığı bırakmayı düşündükleri tespit edilmiştir. Balıkçıların en önemli sorunlarının kaçak avcılık ve avladıkları balığın düşük fiyata satılması olduğu saptanmıştır. Araştırma sonucuna göre balıkçıların hepsinin ikinci bir işinin olduğu belirlenmiştir. Özellikle sezonun kapalı olduğu dönemlerde çoğunluğunun inşaatta işçi olarak çalıştığı, bunun yanında hayvancılık ve tarımla da uğraştıkları tespit edilmiştir.
Discarding is a significant problem due to net damage and labour loss in trammel net fisheries. In this study, the effects of 15, 25, and 35 cm high cloth tarpaulin rigged between the lead line and the net were investigated in reducing the discard amount of trammel nets for red mullet (Mullus barbatus) in the south-eastern Black Sea. During the study, twenty fishing trips were carried out on-board a commercial vessel between May 11 and June 20, 2018. Results showed that there were no significant differences in the amount of discards between the commercial and experimental nets (P>0.05) However, cloth tarpaulin mounted nets (CTMN) were found to be significantly successful to reduce the amount of shore crab (Liocarcinus depurator) and the veined rapa whelk (Rapana venosa) (P<0.05). Although it is insignificant, a decline of capture was also observed in the amount of target species in CTMN compared to the commercial net (CN). Finally, the advantages and concerns of this gear modification, and potential reasons for the reduction of target and discard species are discussed.
This study was conducted with the contributions of 77 interview participants to determine the characteristics of the trammel net and fishing boats, problems of fishermen, and the landing amount of pearl mullet (Alburnus tarichi, Güldenstädt, 1814) captured in Lake Van between 2016 and 2017. According to the results, it was found out that trammel nets were the only fishing gear that are used by fishermen on pearl mullet fishing in Lake Van. In terms of the FAO standards, it was found out that the technical plans of trammel nets were drawn accordingly, and a fishing boat uses an average of 4393 m of trammel net. In addition, it was determined that the fishing boats used in pearl mullet fishery in Lake Van had an average engine power of 92±36.75 BG and the average length of the boats was 12±2.25 m. Furthermore, the most important problems of fishermen were named as illegal, uncontrolled, and unregulated (IUU) fishing, low fish prices, and lack of harbor facilities.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.