Abstract
Using traps and passive integrated transponder (PIT) telemetry, we investigated the effectiveness of the nature-like fishway installed at Sangju Weir on the Nakdong River, Korea. In 11 regular checks over the study period, 1474 individuals classified into 19 species belonging to 5 families were collected by the traps, representing 66% of the species inhabiting the main channel of the Nakdong River. PIT tags were applied to 1615 individuals belonging to 22 species, revealing fishway attraction and passing rates of 20.7% and 14.5%, respectively. Interspecific differences were also shown. For 63.2% of fishes, it took more than a day to pass through the fishway. Some individuals spent a longer time (>28 days) inside the fishway, suggesting the fishway was also being used for purposes other than passage. In this study, we verified species diversity of fish using a nature-like fishway installed in a large river in Korea. The results of this study provide a useful contribution to the development of fishways suitable for fish species endemic to Korea and for non-salmonid fish species worldwide.
Highlights
A large number of structures such as dams and weirs have been constructed across rivers and streams for management of water resources
66.0% of the fish species inhabiting the main channel of the Nakdong River used the fishway (Table 2)
The TL distribution of fish species inhabiting the main channel of the Nakdong River demonstrated that individuals ranging in sizes from 50 to 100 mm accounted for approximately 50% of the total, and the ratio gradually decreased as the size of the individuals increased
Summary
A large number of structures such as dams and weirs have been constructed across rivers and streams for management of water resources. These structures alter the physical properties of rivers and riverine environments, and affects water quality by slowing down its flow. They affect the movement of migratory fish by reducing the longitudinal connectivity of the river [1,2]. Among the various types of fishways, Water 2016, 8, 3; doi:10.3390/w8010003 www.mdpi.com/journal/water
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