Seyhan Baraj Gölü, Adana, Türkiye’de Sudak Sander lucioperca (Linnaeus, 1758) Avcılığında Kullanılan Farklı İğne Tiplerinin Yakala Bırak Sonrası Ölüm Oranı ve Av Verimi Üzerine Etkisi

Abstract

Bu çalışmada, J tipi ve çember iğne tiplerinin sudak (Sander lucioperca) türünde yakala-bırak sonrası hayatta kalma oranı ve av verimliliği üzerindeki etkileri araştırılmıştır. Balıkçılık denemelerinde, boyları 21–60 cm arasında değişen toplam 56 sudak bireyi yakalanmış ve ölüm oranları, iğne tipi ile takılma konumuna göre (derin ve sığ takılma) değerlendirilmiştir. Bireylerin yakalandığı su sıcaklığı 21°C ile 32°C arasında değişmiştir. Bulgular, hem J tipi hem de çember iğnelerde derin takılmanın sığ takılmaya kıyasla daha yüksek ölüm oranlarına yol açtığını göstermiştir. Özellikle çember iğneyle derin takılan bireylerde ölüm oranı %100’e yakın bulunmuştur. J tipi iğnelerde bu oran daha düşük olmakla birlikte halen yüksektir (%83,33). Sığ takılmalarda ise her iki iğne tipinde ölüm oranları daha düşük bulunmuştur (Çember: %25, J tipi: %6,6). Lojistik regresyon analizinde, sığ takılmanın hayatta kalma olasılığını anlamlı biçimde artırdığı gösterilmiş (p<0,001), ancak iğne tipinin hayatta kalma üzerinde anlamlı bir etkisi olmadığı belirlenmiştir (p>0,05). Ayrıca, balık boyu ve su sıcaklığı gibi parametrelerin ölüm oranını etkileyen faktörler olmadığı saptanmıştır (p>0,05). Av verimliliği (CPUE) açısından iğne tipleri arasında istatistiksel olarak anlamlı bir fark görülmemiştir (p>0,05). Mevsimsel olarak ilkbahar aylarında yaz aylarına kıyasla av verimliliği anlamlı biçimde daha yüksek bulunmuştur (p<0,05).

Keywords

• Yakala-bırak balıkçılığı
• Rekreasyonel balıkçılık
• İğnenin takılma konumu
• Çember iğne
• J iğne
• ölüm oranı

Effects of Different Hook Types on Post-Release Mortality and Catch Efficiency of Pikeperch Sander lucioperca (Linnaeus, 1758) in Seyhan Dam Lake, Adana, Türkiye

Abstract

This study investigated the effects of J and circle hook types on post-release mortality and catch efficiency of pikeperch in catch and release fishing. In fishing trials, a total of 56 pikeperch, ranging in size from 21 to 60 cm, were caught, and mortality rates were examined based on the hook type and the hooking location (deep or shallow in where the hooks were found inside the mouth). The water temperature at which the individuals were caught ranged from 21 °C to 32 °C. The results obtained showed that deep hooking caused higher mortality rates than shallow hooking for both hook types. Especially in deep hooking individuals with circle hooks, the mortality rate was close to 100%. Although the mortality rate was also high in deep hooking fishing with J-hooks, it was lower than that of circle hooks (83.33%). The mortality rates were lower for both hook types in shallow hooking (Circle: 25%, J: 6.6%). Logistic regression analysis revealed that while shallow hooking significantly increased the probability of survival (p<0.001), hook type had no significant effect (p>0.05). Furthermore, fish size and water temperature were not found to be parameters affecting mortality rate in this study (p>0.05). In terms of catch efficiency (CPUE), no statistically significant difference was found between the hook types (p>0.05). Seasonally, catch efficiency was found to be significantly higher in spring compared to summer months (p<0.05).

Keywords

• Catch and release
• recreational fisheries
• hooking location
• circle hook
• J hook
• mortality rate

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