Akademik Veri Yönetim Sistemi
3rd International Aquatic Biotechnology Symposium, İstanbul, Türkiye, 25 - 27 Eylül 2024, cilt.1, sa.1, ss.48, (Özet Bildiri)
Hydraulic barriers negatively affect the ecological continuity of streams and those barriers can restrict or even block the movements of aquatic biota in stream-wise and lateral directions. A field study has been carried out in the Lake Sapanca basin, which is situated between the Gulf of İzmit and the Sakarya River in the Marmara Region of Turkey. The catchment area of Lake Sapanca is about 251 km² and it is surrounded by mountains and small hills. In the basin, there are 28 freshwater fish species 6 of which are endemic. Several barriers (i.e., weir, desilting barrage, culvert) cut the connections between up- and down-streams and prevent the movements of fish at short distances of 150-500 meters. This situation threatens the fish populations and 9 fish species became extinct in the basin. Kurtköy Stream the Sapanca basin was selected as a pilot study and a Larinier fish passage was installed on one of the concrete weirs. Larinier fish passage is generally installed at steep bed slopes of more than 12% and it is particularly wellsuited for salmonids due to its highly developed and far-reaching attracting current. However, in this study, Larinier fish pass was installed at a mild slope of 4% as an innovative approach to provide passage for multiple fish species. Accordingly, the fish upstream migration characteristics and flow structure of the Larinier fish pass were monitored simultaneously. Local velocities in the fish passage were measured using a 2D Acoustic Doppler Velocimeter under different inflow conditions. From those velocity measurements, the spatial distributions of velocity and Froude number were obtained. The monitoring data showed that the modified lowslope Larinier fishway provides favorable hydraulic conditions and different migration corridors for multiple fish species including small-bodied fish.
Keywords: Barrier, Fish Upstream Migration, Larinier Fish Pass, Small-bodied fish
Acknowledgment: This work was supported by the TÜBİTAK-1001 (Project Number 122Y318).