Akademik Veri Yönetim Sistemi
Aquatic Science and Engineering, cilt.38, sa.3, ss.145-150, 2023 (Hakemli Dergi)
The Karasu River (Van, Turkey) is one of the most important sources of intensive reproduction for
Tarek (Alburnus tarichi Güldenstädt, 1814) in the Van Lake basin. However, sand pits and sand extraction
activities in the Karasu River threaten the spawning areas of A. tarichi. This study aimed to
investigate how increased sediment concentration in the Karasu River affects the eggs and larvae
of A. tarichi during the reproductive period. The study in the laboratory was designed by measuring
total suspended solids and turbidity associated with the river over two years for five different
experimental groups (corresponding to 0, 10, 50, 100, and 600 mg L-1, and associated groups:
control group, Group 1, Group 2, Group 3, and Group 4, respectively). The percentage of hatched
out larvae was statistically different between the groups (p<0.05). The highest percentages of
hatched out larvae were found in the control group (73.98±5.89%) and Group 1 (68.05±2.96%). The
highest survival rates in larvae were determined in the control group (53.35±5.62%) and Group 1
(44.98±4.41%). These results demonstrate that A. tarichi is sensitive to suspended solid concentrations
that are very common in the natural environment. In conclusion, sand pits and sand extraction
activities must be stopped completely during the reproductive period of A. tarichi between May
and July and strict controls should be put in place during this time. These measures will provide an
important contribution to ensuring the continuity of this species.