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.

Distribution and Some Diagnostic Properties of Capoeta damascina (Valenciennes, 1842) in Streams of the Ceyhan and Seyhan River Basins, Türkiye

“…It is therefore referred to as "Yellow Fish" in the area and is significant for both reactionary and commercial fishing in streams that are connected to the river system. The C. damascina species spawns in the spring, when the males' heads are covered in tiny white reproductive tubercules (Alp et al 2020). 1).…”

“…C. damascina individuals in the Ceyhan and Seyhan River basins were reported as Capoeta capoeta angorae in studies conducted by Alp et al (2005). Later, taxonomic and molecular studies by Alp et al (2020), Alwan (2010), Alwan et al (2016b) and Turan et al (2022) demonstrated that the species C. angorae found in the Ceyhan and Seyhan River basins is strictly synonymous with C. damascina.…”

“…Today, there are many reservoirs and hydroelectric power plants (HPP) in the Ceyhan and Seyhan River system. For example, there are 9 reservoirs and 50 small hydroelectric power plants (HPP) in the Ceyhan River system (Alp et al 2020). Most of these hydroelectric power plants (HPP) do not have fish passes (Alp et al 2020).…”

“…For example, there are 9 reservoirs and 50 small hydroelectric power plants (HPP) in the Ceyhan River system (Alp et al 2020). Most of these hydroelectric power plants (HPP) do not have fish passes (Alp et al 2020). It is inevitable that these adverse conditions will cause habitat loss in the reproductive migration (Alp et al 2020) C. damascina populations.…”

“…Most of these hydroelectric power plants (HPP) do not have fish passes (Alp et al 2020). It is inevitable that these adverse conditions will cause habitat loss in the reproductive migration (Alp et al 2020) C. damascina populations. There is no study in the literature that determined the extensive distribution areas of C. damascina in the Ceyhan and Seyhan basins.…”