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.
Highlights
River habitats that have important roles for the sustainability of fish populations are negatively affected by engineering structures such as dams and hydropower plants built on rivers (Larinier 2000; Marmulla 2001; Jackson and Marmulla 2001)
Migratory fish species ascending through the fish passage
Trap placement Traps were installed into fish passages in Fırnız Stream and Tekir Stream on the 20th of April 2012 and 2013, respectively
Summary
River habitats that have important roles for the sustainability of fish populations are negatively affected by engineering structures such as dams and hydropower plants built on rivers (Larinier 2000; Marmulla 2001; Jackson and Marmulla 2001). Fish stocks decline, certain fish species become extinct or fragmented populations come into the picture (Larinier 2000; Roscoe and Hinch 2010). The impacts are due to the interception of migratory routes, alteration of the hydrological regime, and reduction of spawning and nursery habitats (Wagner et al 2012; Agostinho et al 2004). The observations for the fish passages in Turkey have shown that they were constructed without proper assessment and usage of basic scientific knowledge on the fish species of concern. More than 370 fish species inhabit Turkish inland waters (Kuru et al 2014), there is no proper inventory for migratory fish species. Contemporary literature does not provide proper information on habitat usages and hydrological requirements of inland water fish in Turkey. It is a wellknown fact that an effective fish passage design requires extensive integration of biological and hydrological data in addition to other physical data (Castro-Santos et al 2009)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Limnology and Freshwater Fisheries Research
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
