Capoeta trutta (Heckel, 1843)

Bilici, Serbest, Ünlü, Erhan, Ciçek, Tarik & Satici, Ömer, 2016, The reproductive biology of Carasobarbus luteus and Capoeta trutta in the Tigris River, Turkey, Cybium 40 (2), pp. 147-153 : 147-148

Capoeta trutta , Capoeta umbla (Heckel, 1843) and Acantho-

brama marmid Heckel, 1843 constitute about 60 percent of the total production ( FAO, 2014).

There have been some studies on the reproductive characteristics, such as sex ratio, spawning time, fecundity and age at first maturity of both C. trutta and C. luteus in the Tigris and Euphrates River systems in Turkey ( Ünlü, 1991; Duman, 2004; Kalkan, 2008; Oymak et al., 2008; Düşükcan and Çalta, 2012; Canpolat and Çalta, 2013, 2014; Aral et al., 2014), in Iraq ( Ahmed et al., 1984; Naama and Muhsen, 1986; Bartel et al., 1996; Rahemo and Al-Shatter, 2012), in Iran ( Patimar and Farzi, 2011; Eydizadeh, 2014; Poria et al., 2014) and in Syria ( Al-Hazzaa and Hussein, 2003; Al-Hazzaa, 2005). However, research on biology of C. trutta in the Tigris River in Turkey was realized before dams were constructed. Many environmental changes have occurred due to start of dam activities. Besides, there is no study on reproduction of C. luteus population in the upper part of the

Tigris River in Turkey. The Tigris River and its tributaries are spread over a wide geographical area, showing climatic differences in populations of these species in Tigris River and these parts of Turkey differ from those of Iraq, Iran and Syria ( Patimar and Farzi, 2011). Thus, knowledge on the reproductive characteristics is critical for understanding the future of the species due to environmental changes. There- fore, this study was carried out to determine the reproductive characteristics, including sex ratio, age at first sexual maturity, spawning time, gonadosomatic index, ova diameter and fecundity, of both C. luteus and C. trutta in the Turkish part of the Tigris River.