 In 2015, some experts recommend a 10-year fishing moratorium to allow the remaining populations to recover, and in January 2020 China imposed a 10-year fishing moratorium on 332 sites along the Yangtze.Dams present another serious problem, as several species in the river perform breeding migrations and most of these are non-jumpers, meaning that normal fish ladders designed for salmon are ineffective.For example, the Gezhouba Dam blocked the migration of the paddlerfish and two sturgeon, while also effectively splitting the Chinese high fin banded shark population into two and causing the extirpation of the Yangtze population of the Japanese eel.