Chongqing Yubei National Agricultural Science and Technology Park. There is a comprehensive trading market for aquatic products in Sanya Bay, Chongqing Yubei National Agricultural Science and Technology Park, which is the largest wholesale market for Monopterus albus in Chongqing. It is feasible to purchase Monopterus albus in Chongqing Yubei National Agricultural Science and Technology Park. Chongqing, referred to as "Chongqing" or "Mountain City" for short, is a municipality directly under the Central Government of the People's Republic of China, a national central city and a megacity.