An Overview of the Factors Affecting the Migration of Sturgeons in Yesilirmak

Abstract

The Yesilirmak is one of the rivers in Turkey where sturgeons migrate for spawning. It originates in the Kosedag Mountains in Sivas and flows into the Black Sea at the plain of Carsamba. The Yesilirmak plays a major role in agricultural production and irrigation, and it also supplies energy due to the hydroelectric power plant (HPP). Serious structural changes and significant habitat loss for sturgeons and other fish species have occurred due to the dams and HPPs in the Yesilirmak, especially since the 1970s. It is also a known fact that fish passages in these constructions are not suitable for the sturgeons to pass through. Unfortunately, coastal regulations along the river have had a negative effect on the habitats. Although the Yesilirmak has lost quite a lot of its natural structure and its waterway gradually shortened due to the HPPs, sturgeons can still migrate upstream into it. Therefore, related sectors and stakeholders should consider the importance of the Yesilirmak in their planned activities for the future of sturgeons in Turkish waters. In this study, the major factors affecting the sturgeon migration in the Yesilirmak will be evaluated.