Özet:

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.

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