With the frozen Yalu River thawing, fishermen in Dandong City, northeast China's Liaoning Province, are greeting a new season and one of their busiest time of the year. While locals are busy catching fish to meet the market's demand, the city's fishery department has been keeping tabs on farming conditions to protect the Yalu River's water quality. CGTN's Sun Tianyuan visits a fish farm in Kuandian County to find out how locals have managed to boost incomes by employing scientific farming methods.