Sustainable Crab Fishing with Rakkang (Stick Dip Nets): Catch Performance and Socio Economic Evaluation in Tanah Laut, Indonesia

Öz

This study aims to evaluate the catch performance and socio-economic relevance of traditional stick dip nets, by comparing two types, Rakkang-A in Muara Kintap and Rakkang-B in Bawah Layung, Tanah Laut Regency, Indonesia. The fieldworks were conducted between September and October 2024. A total of 580 Rakkang were deployed in the mangrove areas, with sample size: Rakkang-A (n = 73 lifts, 10.43±0.04) and Rakkang-B (n = 71 lifts, 10.14±2.89). The crab catch data on Scylla serrata and S. olivacea were collected, and statistical analysis was performed to determine significant differences in catch rates. Results showed that the two Rakkang types effectively captured both S. serrata and S. olivacea, but with species-specific preferences. Rakkang-A was more effective for S. olivacea, while Rakkang-B yielded higher catches of S. serrata. Catch per unit effort (CPUE) analysis revealed that Rakkang-A had a higher CPUE for S. olivacea (0.14 ind/trap) compared to Rakkang-B (0.05 ind/trap). Conversely, both Rakkang types performed equally for S. serrata (0.16 ind/trap). Overall, CPUE of Rakkang-A (0.30±0.03) was approximately 1.34 times greater than that of Rakkang-B (0.22±0.05). The bait selection played a crucial role, with S. olivacea being more attracted to fish bait, whereas S. serrata preferred crab bait. These findings highlight the importance of selecting the appropriate Rakkang type and bait for optimizing crab fishing efficiency. Further research on environmental factors and gear modifications could enhance sustainability and economic viability for local fishers.

Anahtar Kelimeler

• Crab fishery
• Productivity
• Sustainability
• Indonesia
• Blue economy

Rakkang (Katlanabilir Sepet) ile Sürdürülebilir Yengeç Balıkçılığı: Endonezya, Tanah Laut'ta Yakalama Performansı ve Sosyo Ekonomik Değerlendirme

Öz

Bu çalışma, Endonezya, Tanah Laut Regency, Muara Kintap'taki Rakkang-A ve Bawah Layung'daki Rakkang-B olmak üzere iki türü karşılaştırarak, geleneksel katlanabilir sepetlerin yakalama performansını ve sosyo-ekonomik önemini değerlendirmeyi amaçlamaktadır. Saha çalışmaları Eylül ve Ekim 2024 arasında yürütülmüştür. Mangrov alanlarına toplam 580 Rakkang konuşlandırılmış olup, örneklem büyüklüğü şu şekildedir: Rakkang-A (n = 73 kaldırma, 10,43 ± 0,04) ve Rakkang-B (n = 71 kaldırma, 10,14 ± 2,89). Scylla serrata ve S. olivacea'da yengeç yakalama verileri toplanmıştır ve yakalama oranlarındaki önemli farklılıkları belirlemek için istatistiksel analiz yapılmıştır. Sonuçlar, iki Rakkang türünün hem S. serrata'yı hem de S. olivacea'yı etkili bir şekilde yakaladığını, ancak türlere özgü tercihlerin olduğunu göstermiştir. Rakkang-A, S. olivacea için daha etkiliyken, Rakkang-B daha fazla S. Serrata’yı avlamıştır. Birim çaba başına yakalama (CPUE), Rakkang-A'nın S. olivacea için (0,14 ind/tuzak) Rakkang-B'ye (0,05 ind/tuzak) kıyasla daha yüksek bir CPUE'ye sahip olduğunu ortaya koydu. Tersine, her iki Rakkang tipi de S. serrata için eşit performans gösterdi (0,16 ind/tuzak). Genel olarak, Rakkang-A'nın CPUE'si (0,30 ± 0,03), Rakkang-B'den (0,22 ± 0,05) yaklaşık 1,34 kat daha fazlaydı. Yem seçimi önemli bir rol oynadı; S. olivacea balık yemine daha çok çekilirken, S. serrata yengeç yemini tercih etti. Bu bulgular, yengeç avcılığının verimliliğini optimize etmek için uygun Rakkang tipini ve yemini seçmenin önemini vurgulamaktadır. Çevresel faktörler ve ekipman değişiklikleri üzerine daha fazla araştırma yapılması, yerel balıkçılar için sürdürülebilirliği ve ekonomik uygulanabilirliği artırabilir.

Anahtar Kelimeler

• Yengeç balıkçılığı
• Üretkenlik
• Sürdürülebilirlik
• Endonezya
• Mavi ekonomi

Kaynakça

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