Ceyhan Nehri’ndeki (Türkiye) Balık Geçitlerinin Etkinlikleri ve Uygunlukları

Abstract

Ceyhan Nehir havzasında bulunan iki balık geçidinin etkinlikleri trap uygulaması, dıştan takma markalamalar (T-bar anchor tag), PIT telemetri ve radio telemetri yöntemleri ile incelenmiştir. Çalışma sonuçlarına göre havuzlu ve orifisli balık geçidine yerleştirilen trapta hiç bir balık tespit edilememiş olduğundan bu balık geçidinin etkinliğinin olmadığı belirlenmiştir. Ayrıca 50 adet dıştan takma marka, 44 adet PIT marka ve 47 adet radio markası taşıyan balıklardan hiç birinin bu balık geçidinden geçmediği görülmüştür. Dikey yarıklı balık geçidine yerleştirlen trapta ise toplam 900 Capoeta damascina ve 520 Alburnus adanensis tespit edilmiştir. Göç yapan C. damascina bireylerinin cinsiyet oranları ile göç zamanları arasında bir ilişki tespit edilmiştir. Uygulanan yöntemlere göre balık geçidinin performansı farklılık göstermiştir. Bu farklılık markalanan balıkların boylarının farklı olmasından kaynaklanmıştır. Çünkü radyo taglarla markalanan balıkların boyları PIT taglarla ve dıştan takma markalarla markalanan balıklardan daha büyüktü ve bu nedenle radyo telemetri yöntemine göre hesaplanan balık geçidi performansı diğer yöntemlere göre daha yüksek bulunmuştur. Ayrıca, 20 cm’den büyük balıkların balık geçidinden geçme performansı küçük balıklara göre daha yüksek olmuştur.

Keywords

• Balık geçidi,balık göçü,etkinlik,trap,telemetri

Efficiency and Suitability of the Fish Passages of River Ceyhan, Turkey

Abstract

The efficiencies of the two fish passages of River Ceyhan (Turkey) were investigated by using trap catches, external tags (T-bar anchor tags), PIT telemetry and radio telemetry. According to the results of the study, the pool and weir type fish passage were not effective; no fish entered the trap in this fish passage. Further, it was observed that none of the 50 external tagged fishes, 44 PIT-tagged fishes, and 47 radio-tagged fishes passed through this fish passage. A total of 900 Capoeta damascina and 520 Alburnus adanensis entered the trap installed in the vertical slot fish passage. A relationship was found between the gender ratio of the migratory C. damascina and their migration times. Fish passage performance was different according to the applications. These differences in fish passage success among the applications originated from the sizes of the tagged fish. Because the sizes of the radio-tagged fish were much larger than that of the external tagged fish and PIT-tagged fish so the success of the fish passage according to the radio telemetry was estimated higher than that of the other applications. The further passing ratio of the fish over 20 cm in length was higher than that of the small individuals.

Keywords

• Fish passage,fish migration,efficiency,trap,telemetry

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