Resumen
The great cormorant (Phalacrocorax carbo) is one of the most nimble fish predators in the bird class. Its nimbleness, tirelessness and success in hunting make it an unwelcome guest in any country with a well-developed tradition of pond farming. Cormorant flocks can kill most of a pond's population by hunting. By the end of the 20th century, wild cormorants in the Czech Republic were so rare that they were listed as an endangered species. Due to this protection, the population increased. However, this increase caused damages to fish farms and moreover to wild fish population in rivers, which resulted in state-regulated hunting. Over the years, both resident and migratory cormorants have appeared more and more in the Czech Republic. Here we address the impact of recent changes in legislation on the abundance of this species and damages caused by them in this central European country in the last 10 years.